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Correspondence to Iowa Utilities Board on Alliant Energy's Proposed Electric Rate IncreaseCity of Dubuque City Council Meeting Consent Items # 06. Copyrighted February 19, 2024 ITEM TITLE: Correspondence to Iowa Utilities Board on Alliant Energy's Proposed Electric Rate Increase SUMMARY: City Manager recommending City Council approval to send the attached letter to the Iowa Utilities Board on Alliant Energy's Proposed Electric Rate I ncrease. SUGGESTED Suggested Disposition: Receive and File; Approve DISPOSITION: ATTACHMENTS: Description Correspondence Customer Notice Cover Letter Attachment A Attachment B Attachment C Attachment D Type Supporting Documentation Supporting Documentation Supporting Documentation Supporting Documentation Supporting Documentation Supporting Documentation THE CITY OF D Ur B TE Masterpiece on the Mississippi Iowa Utilities Board 1375 E. Court Ave. Des Moines, IA 50319 Dubuque Office of the Mayor All lU�erl� CRY Office Hall\tRTv.TI : 1.Y 1 S I 50 West 13th Street Dubuque, IA 52001-4845 2007-2012.2013 www.cityofdubuque.org 2017*2019 February 7, 2024 Re: Docket RPU-2023-0002 ALLIANT ENERGY'S PROPOSED ELECTRIC RATE INCREASE To Whom It May Concern: Interstate Power and Light Company (dba Alliant Energy) has asked the Iowa Utilities Board to approve a two-year phased -in rate increase that the company estimates will increase the electric bills of residential customers by 13.4%, small businesses by 20%, and large general service customers by 17.4% - 20%. The City calls on Alliant to carefully consider the potential cost burdens experienced by Dubuque residents and businesses with such rate increases. The City of Dubuque asks the Iowa Utilities Board to: • Scrutinize any rate increases proposed to ensure Alliant Energy is judiciously managing its system and the funds entrusted to Alliant Energy, and • Review all data to confirm the proposed actions are in the overall best interests of the customers of Alliant Energy. Thank you for your work and review of this matter. Mayor Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Alliant Alliant Energy Energy Legal Department 200 First Street SE P.O. Box 351 Cedar Rapids, IA 52406-0351 October 6, 2023 Office: (319) 786-4505 alliantenergy.com Executive Secretary Iowa Utilities Board 1375 East Court Avenue Des Moines, IA 50319-0069 RE: Interstate Power and Light Company Docket No. RPU-2023-0002 Customer Notices Dear Executive Secretary: Enclosed please find copies of Interstate Power and Light Company's (IPL) Customer Notices related to the above -referenced Application for Revision of Electric and Natural Gas Rates. The enclosed electric and natural gas Customer Notices will be provided to customers in compliance with Iowa Code section 476.6(2). Copies (see Attachments A and B) are being provided to the Iowa Utilities Board (Board) five days prior to transmitting the notices to customers (Order) in compliance with 199 IAC section 26.4(1)(b)5), as modified by the Board's September 5, 2023 Order Approving Customer Notices, Conditionally Granting Waivers, and Scheduling Consumer Comment Meetings. The Board's Order permits IPL to file its Customer Notices with the Board five days prior to transmitting the notices to customers. Additionally, IPL is providing Attachments C and D' which provide the calculations of all amounts included in the Customer Notices with applicable source references. Please do not hesitate to contact the undersigned counsel if you have any questions. Sincerely, By: /s/ Matthew J. Sowden Matthew J. Sowden Corporate Counsel 500 East Court Avenue, Suite 300 Des Moines, IA 50309 Telephone: (515) 558-9703 matthewsowden(c�alliantenergy.com By: /s/ Tara Z. Hall Tara Z. Hall Dentons Davis Brown PC 215 10th Street, Suite 1300 Des Moines, IA 50309 Telephone: (515) 288-2500 Tara. Hal l(a�dentons.com The calculations in Attachments C and D source to exhibits that will be filed with IPL's Application for Revision of Electric and Natural Gas Rates. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 1 of 14 ,AI Alliant Energy. Notice of proposed electric rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal to the Iowa Utilities Board on October 12, 2023 to adjust customersOelectric rates in late 2024. The drivers of our proposed electric rate increase include our investments to build a more reliable, sustainable and resilient energy future to benefit our customers and the communities we serve in Iowa. We are investing to diversify our generation resources, expand economic opportunities, replace and upgrade aging infrastructure and create a healthier environment that benefits all Iowans. By building cost-effective projects and modernizing the energy grid, weDII be improving security, reliability and resilience. At the same time, we are continuing to meet all c u stomersO energy needs in light of rising costs that have impacted all industries. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. The new rates are proposed to be phased in over approximately two years with increases in October 2024 and October 2025. If the Iowa Utilities Board decides that the proposed rates will be implemented in a different time period, the increase may vary from what is shown in the chart. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 2 of 14 Estimated average monthly electric bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average Proposed Average bill Proposed Average bill Proposed total bill prior to monthly bill beginning in monthly bill beginning in monthly bill October 2024 increase % October 2024 increase % October 2025 increase % effective in effective in October 2024 October 2025 Residential " $130.24 7.7% $140.29 5.7% $147.64 13.4% Non -Residential $325.52 11.1 % $361.63 8.9% $390.63 20.0% General Service *" Large General $17,091.85 9.8% $18,764.59 7.6% $20,071.65 17.4% Service Large General $26,448.77 11.1 % $29,382.76 8.9% $31,738.52 20.0% Service - Supplementary High Load Factor 1,985,243.94 11.1 % 1 $2,204,707.70 1 8.9% $2,380,796.80 20.0% Lighting $296.51 0.0% $296.51 0.0% $296.51 0.0% Standby $279,041.98 7.0% 1 $298,634.85 5.0% $312,533.78 12.0% *Assumes typical customer using 738 kWh per month. Includes proposed monthly increase in basic service charge from $13.00 to $15.50. **Assumes typical customer using 1,996 kWh per month. Includes proposed monthly increase in basic service charge from $20.00 to $23.00. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140449 WF 861250 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 3 of 14 ,AI Alliant Energy. Notice of proposed electric rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal to the Iowa Utilities Board on October 12, 2023 to adjust customersOelectric rates in late 2024. The drivers of our proposed electric rate increase include our investments to build a more reliable, sustainable and resilient energy future to benefit our customers and the communities we serve in Iowa. We are investing to diversify our generation resources, expand economic opportunities, replace and upgrade aging infrastructure and create a healthier environment that benefits all Iowans. By building cost-effective projects and modernizing the energy grid, weDII be improving security, reliability and resilience. At the same time, we are continuing to meet all c u stomersO energy needs in light of rising costs that have impacted all industries. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. The new rates are proposed to be phased in over approximately two years with increases in October 2024 and October 2025. If the Iowa Utilities Board decides that the proposed rates will be implemented in a different time period, the increase may vary from what is shown in the chart. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 4 of 14 Estimated average monthly electric bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average Proposed Average bill Proposed Average bill Proposed total bill prior to monthly bill beginning in monthly bill beginning in monthly bill October 2024 increase % October 2024 increase % October 2025 increase % effective in effective in October 2024 October 2025 Residential " $130.24 7.7% $140.29 5.7% $147.64 13.4% Non -Residential $325.52 11.1 % $361.63 8.9% $390.63 20.0% General Service *" Large General $17,091.85 9.8% $18,764.59 7.6% $20,071.65 17.4% Service Large General $26,448.77 11.1 % $29,382.76 8.9% $31,738.52 20.0% Service - Supplementary High Load Factor 1,985,243.94 11.1 % 1 $2,204,707.70 1 8.9% $2,380,796.80 20.0% Lighting $296.51 0.0% $296.51 0.0% $296.51 0.0% Standby $279,041.98 7.0% 1 $298,634.85 5.0% $312,533.78 12.0% *Assumes typical customer using 738 kWh per month. Includes proposed monthly increase in basic service charge from $13.00 to $15.50. **Assumes typical customer using 1,996 kWh per month. Includes proposed monthly increase in basic service charge from $20.00 to $23.00. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140462 WF 867050 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 5 of 14 ,AI Alliant Energy. Notice of proposed electric rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal to the Iowa Utilities Board on October 12, 2023 to adjust customersOelectric rates in late 2024. The drivers of our proposed electric rate increase include our investments to build a more reliable, sustainable and resilient energy future to benefit our customers and the communities we serve in Iowa. We are investing to diversify our generation resources, expand economic opportunities, replace and upgrade aging infrastructure and create a healthier environment that benefits all Iowans. By building cost-effective projects and modernizing the energy grid, weDII be improving security, reliability and resilience. At the same time, we are continuing to meet all c u stomersO energy needs in light of rising costs that have impacted all industries. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. The new rates are proposed to be phased in over approximately two years with increases in October 2024 and October 2025. If the Iowa Utilities Board decides that the proposed rates will be implemented in a different time period, the increase may vary from what is shown in the chart. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 6 of 14 Estimated average monthly electric bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average Proposed Average bill Proposed Average bill Proposed total bill prior to monthly bill beginning in monthly bill beginning in monthly bill October 2024 increase % October 2024 increase % October 2025 increase % effective in effective in October 2024 October 2025 Residential " $130.24 7.7% $140.29 5.7% $147.64 13.4% Non -Residential $325.52 11.1 % $361.63 8.9% $390.63 20.0% General Service *" Large General $17,091.85 9.8% $18,764.59 7.6% $20,071.65 17.4% Service Large General $26,448.77 11.1 % $29,382.76 8.9% $31,738.52 20.0% Service - Supplementary High Load Factor 1,985,243.94 11.1 % 1 $2,204,707.70 1 8.9% $2,380,796.80 20.0% Lighting $296.51 0.0% $296.51 0.0% $296.51 0.0% Standby $279,041.98 7.0% 1 $298,634.85 5.0% $312,533.78 12.0% *Assumes typical customer using 738 kWh per month. Includes proposed monthly increase in basic service charge from $13.00 to $15.50. **Assumes typical customer using 1,996 kWh per month. Includes proposed monthly increase in basic service charge from $20.00 to $23.00. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140464 WF 867114 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 7 of 14 ,AI Alliant Energy. Notice of proposed electric rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal to the Iowa Utilities Board on October 12, 2023 to adjust customersOelectric rates in late 2024. The drivers of our proposed electric rate increase include our investments to build a more reliable, sustainable and resilient energy future to benefit our customers and the communities we serve in Iowa. We are investing to diversify our generation resources, expand economic opportunities, replace and upgrade aging infrastructure and create a healthier environment that benefits all Iowans. By building cost-effective projects and modernizing the energy grid, weDII be improving security, reliability and resilience. At the same time, we are continuing to meet all c u stomersO energy needs in light of rising costs that have impacted all industries. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. The new rates are proposed to be phased in over approximately two years with increases in October 2024 and October 2025. If the Iowa Utilities Board decides that the proposed rates will be implemented in a different time period, the increase may vary from what is shown in the chart. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 8 of 14 Estimated average monthly electric bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average Proposed Average bill Proposed Average bill Proposed total bill prior to monthly bill beginning in monthly bill beginning in monthly bill October 2024 increase % October 2024 increase % October 2025 increase % effective in effective in October 2024 October 2025 Residential " $130.24 7.7% $140.29 5.7% $147.64 13.4% Non -Residential $325.52 11.1 % $361.63 8.9% $390.63 20.0% General Service *" Large General $17,091.85 9.8% $18,764.59 7.6% $20,071.65 17.4% Service Large General $26,448.77 11.1 % $29,382.76 8.9% $31,738.52 20.0% Service - Supplementary High Load Factor 1,985,243.94 11.1 % 1 $2,204,707.70 1 8.9% $2,380,796.80 20.0% Lighting $296.51 0.0% $296.51 0.0% $296.51 0.0% Standby $279,041.98 7.0% 1 $298,634.85 5.0% $312,533.78 12.0% *Assumes typical customer using 738 kWh per month. Includes proposed monthly increase in basic service charge from $13.00 to $15.50. **Assumes typical customer using 1,996 kWh per month. Includes proposed monthly increase in basic service charge from $20.00 to $23.00. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140465 WF 867178 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 9 of 14 ,AI Alliant Energy. Notice of proposed electric rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal to the Iowa Utilities Board on October 12, 2023 to adjust customersOelectric rates in late 2024. The drivers of our proposed electric rate increase include our investments to build a more reliable, sustainable and resilient energy future to benefit our customers and the communities we serve in Iowa. We are investing to diversify our generation resources, expand economic opportunities, replace and upgrade aging infrastructure and create a healthier environment that benefits all Iowans. By building cost-effective projects and modernizing the energy grid, weDII be improving security, reliability and resilience. At the same time, we are continuing to meet all c u stomersO energy needs in light of rising costs that have impacted all industries. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. The new rates are proposed to be phased in over approximately two years with increases in October 2024 and October 2025. If the Iowa Utilities Board decides that the proposed rates will be implemented in a different time period, the increase may vary from what is shown in the chart. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 10 of 14 Estimated average monthly electric bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average Proposed Average bill Proposed Average bill Proposed total bill prior to monthly bill beginning in monthly bill beginning in monthly bill October 2024 increase % October 2024 increase % October 2025 increase % effective in effective in October 2024 October 2025 Residential " $130.24 7.7% $140.29 5.7% $147.64 13.4% Non -Residential $325.52 11.1 % $361.63 8.9% $390.63 20.0% General Service *" Large General $17,091.85 9.8% $18,764.59 7.6% $20,071.65 17.4% Service Large General $26,448.77 11.1 % $29,382.76 8.9% $31,738.52 20.0% Service - Supplementary High Load Factor 1,985,243.94 11.1 % 1 $2,204,707.70 8.9% $2,380,796.80 1 20.0% Lighting $296.51 0.0% $296.51 0.0% $296.51 0.0% Standby $279,041.98 7.0% 1 $298,634.85 5.0% $312,533.78 12.0% *Assumes typical customer using 738 kWh per month. Includes proposed monthly increase in basic service charge from $13.00 to $15.50. **Assumes typical customer using 1,996 kWh per month. Includes proposed monthly increase in basic service charge from $20.00 to $23.00. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140472 WF 867242 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 11 of 14 ,AI Alliant Energy. Notice of proposed electric rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal to the Iowa Utilities Board on October 12, 2023 to adjust customersOelectric rates in late 2024. The drivers of our proposed electric rate increase include our investments to build a more reliable, sustainable and resilient energy future to benefit our customers and the communities we serve in Iowa. We are investing to diversify our generation resources, expand economic opportunities, replace and upgrade aging infrastructure and create a healthier environment that benefits all Iowans. By building cost-effective projects and modernizing the energy grid, weDII be improving security, reliability and resilience. At the same time, we are continuing to meet all c u stomersO energy needs in light of rising costs that have impacted all industries. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. The new rates are proposed to be phased in over approximately two years with increases in October 2024 and October 2025. If the Iowa Utilities Board decides that the proposed rates will be implemented in a different time period, the increase may vary from what is shown in the chart. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 12 of 14 Estimated average monthly electric bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average Proposed Average bill Proposed Average bill Proposed total bill prior to monthly bill beginning in monthly bill beginning in monthly bill October 2024 increase % October 2024 increase % October 2025 increase % effective in effective in October 2024 October 2025 Residential " $130.24 7.7% $140.29 5.7% $147.64 13.4% Non -Residential $325.52 11.1 % $361.63 8.9% $390.63 20.0% General Service *" Large General $17,091.85 9.8% $18,764.59 7.6% $20,071.65 17.4% Service Large General $26,448.77 11.1 % $29,382.76 8.9% $31,738.52 20.0% Service - Supplementary High Load Factor 1,985,243.94 11.1% 1 $2,204,707.70 1 8.9% $2,380,796.80 20.0% Lighting $296.51 0.0% $296.51 0.0% $296.51 0.0% Standby $279,041.98 7.0% 1 $298,634.85 5.0% $312,533.78 12.0% *Assumes typical customer using 738 kWh per month. Includes proposed monthly increase in basic service charge from $13.00 to $15.50. **Assumes typical customer using 1,996 kWh per month. Includes proposed monthly increase in basic service charge from $20.00 to $23.00. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140475 WF 867306 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 13 of 14 ,AI Alliant Energy. Notice of proposed electric rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal to the Iowa Utilities Board on October 12, 2023 to adjust customersOelectric rates in late 2024. The drivers of our proposed electric rate increase include our investments to build a more reliable, sustainable and resilient energy future to benefit our customers and the communities we serve in Iowa. We are investing to diversify our generation resources, expand economic opportunities, replace and upgrade aging infrastructure and create a healthier environment that benefits all Iowans. By building cost-effective projects and modernizing the energy grid, weDII be improving security, reliability and resilience. At the same time, we are continuing to meet all c u stomersO energy needs in light of rising costs that have impacted all industries. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. The new rates are proposed to be phased in over approximately two years with increases in October 2024 and October 2025. If the Iowa Utilities Board decides that the proposed rates will be implemented in a different time period, the increase may vary from what is shown in the chart. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment A Page 14 of 14 Estimated average monthly electric bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average Proposed Average bill Proposed Average bill Proposed total bill prior to monthly bill beginning in monthly bill beginning in monthly bill October 2024 increase % October 2024 increase % October 2025 increase % effective in effective in October 2024 October 2025 Residential " $130.24 7.7% $140.29 5.7% $147.64 13.4% Non -Residential $325.52 11.1 % $361.63 8.9% $390.63 20.0% General Service *" Large General $17,091.85 9.8% $18,764.59 7.6% $20,071.65 17.4% Service Large General $26,448.77 11.1 % $29,382.76 8.9% $31,738.52 20.0% Service - Supplementary High Load Factor 1,985,243.94 11.1 % 1 $2,204,707.70 1 8.9% $2,380,796.80 20.0% Lighting $296.51 0.0% $296.51 0.0% $296.51 0.0% Standby $279,041.98 7.0% 1 $298,634.85 5.0% $312,533.78 12.0% *Assumes typical customer using 738 kWh per month. Includes proposed monthly increase in basic service charge from $13.00 to $15.50. **Assumes typical customer using 1,996 kWh per month. Includes proposed monthly increase in basic service charge from $20.00 to $23.00. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140476 WF 867370 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 1 of 18 ,AI Alliant Energy. Notice of proposed gas rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal with the Iowa Utilities Board on October 12, 2023, to adjust customers0gas rates in late 2024. The drivers of our proposed gas rate increase include our investments in our natural gas system by replacing aging materials, installing new inspection and safety equipment and upgrading existing infrastructure to benefit our customers. We are also making investments to enhance our system in light of rising costs that have impacted all industries. This will provide a more secure and reliable energy supply for customers. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 2 of 18 Estimated average monthly gas bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average bill prior to October 2024 Proposed monthly bill increase % effective in October 2024 Average bill beginning in October 2024 Residential" $66.31 5.0% $69.64 Non -Residential General Service— $251.18 2.0% $256.29 Large General Service $10,381.36 4.0% $10,801.13 Contract Demand $38,999.05 10.4% $43,054.80 Large Volume Transport $9,853.80 27.3% $12,542.84 Large Volume Transport Demand - Commodity $26,008.79 31.4% $34,182.25 Small Volume Transport $3,453.93 7.7% $3,719.56 Small Volume Transport - Balancing $507.54 -1.6% $499.48 Pipeline Corridor 1 $41,282.30 0.00% $41,282.30 *Assumes typical customer using 63 therms per month. Includes no proposed monthly increase in basic service charge. **Assumes typical customer using 305 therms per month. Includes no proposed monthly increase in basic service charge. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140477 WF 865340 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 3 of 18 ,AI Alliant Energy. Notice of proposed gas rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal with the Iowa Utilities Board on October 12, 2023, to adjust customers0gas rates in late 2024. The drivers of our proposed gas rate increase include our investments in our natural gas system by replacing aging materials, installing new inspection and safety equipment and upgrading existing infrastructure to benefit our customers. We are also making investments to enhance our system in light of rising costs that have impacted all industries. This will provide a more secure and reliable energy supply for customers. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 4 of 18 Estimated average monthly gas bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average bill prior to October 2024 Proposed monthly bill increase % effective in October 2024 Average bill beginning in October 2024 Residential" $66.31 5.0% $69.64 Non -Residential General Service— $251.18 2.0% $256.29 Large General Service $10,381.36 4.0% $10,801.13 Contract Demand $38,999.05 10.4% $43,054.80 Large Volume Transport $9,853.80 27.3% $12,542.84 Large Volume Transport Demand - Commodity $26,008.79 31.4% $34,182.25 Small Volume Transport $3,453.93 7.7% $3,719.56 Small Volume Transport - Balancing $507.54 -1.6% $499.48 Pipeline Corridor 1 $41,282.30 0.00% $41,282.30 *Assumes typical customer using 63 therms per month. Includes no proposed monthly increase in basic service charge. **Assumes typical customer using 305 therms per month. Includes no proposed monthly increase in basic service charge. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140481 WF 867434 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 5 of 18 ,AI Alliant Energy. Notice of proposed gas rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal with the Iowa Utilities Board on October 12, 2023, to adjust customers0gas rates in late 2024. The drivers of our proposed gas rate increase include our investments in our natural gas system by replacing aging materials, installing new inspection and safety equipment and upgrading existing infrastructure to benefit our customers. We are also making investments to enhance our system in light of rising costs that have impacted all industries. This will provide a more secure and reliable energy supply for customers. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 6 of 18 Estimated average monthly gas bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average bill prior to October 2024 Proposed monthly bill increase % effective in October 2024 Average bill beginning in October 2024 Residential" $66.31 5.0% $69.64 Non -Residential General Service— $251.18 2.0% $256.29 Large General Service $10,381.36 4.0% $10,801.13 Contract Demand $38,999.05 10.4% $43,054.80 Large Volume Transport $9,853.80 27.3% $12,542.84 Large Volume Transport Demand - Commodity $26,008.79 31.4% $34,182.25 Small Volume Transport $3,453.93 7.7% $3,719.56 Small Volume Transport - Balancing $507.54 -1.6% $499.48 Pipeline Corridor 1 $41,282.30 0.00% $41,282.30 *Assumes typical customer using 63 therms per month. Includes no proposed monthly increase in basic service charge. **Assumes typical customer using 305 therms per month. Includes no proposed monthly increase in basic service charge. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140479 WF 867498 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 7 of 18 ,AI Alliant Energy. Notice of proposed gas rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal with the Iowa Utilities Board on October 12, 2023, to adjust customers0gas rates in late 2024. The drivers of our proposed gas rate increase include our investments in our natural gas system by replacing aging materials, installing new inspection and safety equipment and upgrading existing infrastructure to benefit our customers. We are also making investments to enhance our system in light of rising costs that have impacted all industries. This will provide a more secure and reliable energy supply for customers. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 8 of 18 Estimated average monthly gas bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average bill prior to October 2024 Proposed monthly bill increase % effective in October 2024 Average bill beginning in October 2024 Residential" $66.31 5.0% $69.64 Non -Residential General Service— $251.18 2.0% $256.29 Large General Service $10,381.36 4.0% $10,801.13 Contract Demand $38,999.05 10.4% $43,054.80 Large Volume Transport $9,853.80 27.3% $12,542.84 Large Volume Transport Demand - Commodity $26,008.79 31.4% $34,182.25 Small Volume Transport $3,453.93 7.7% $3,719.56 Small Volume Transport - Balancing $507.54 -1.6% $499.48 Pipeline Corridor 1 $41,282.30 0.00% $41,282.30 *Assumes typical customer using 63 therms per month. Includes no proposed monthly increase in basic service charge. **Assumes typical customer using 305 therms per month. Includes no proposed monthly increase in basic service charge. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140485 WF 867562 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 9 of 18 ,AI Alliant Energy. Notice of proposed gas rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal with the Iowa Utilities Board on October 12, 2023, to adjust customers0gas rates in late 2024. The drivers of our proposed gas rate increase include our investments in our natural gas system by replacing aging materials, installing new inspection and safety equipment and upgrading existing infrastructure to benefit our customers. We are also making investments to enhance our system in light of rising costs that have impacted all industries. This will provide a more secure and reliable energy supply for customers. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 10 of 18 Estimated average monthly gas bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average bill prior to October 2024 Proposed monthly bill increase % effective in October 2024 Average bill beginning in October 2024 Residential" $66.31 5.0% $69.64 Non -Residential General Service— $251.18 2.0% $256.29 Large General Service $10,381.36 4.0% $10,801.13 Contract Demand $38,999.05 10.4% $43,054.80 Large Volume Transport $9,853.80 27.3% $12,542.84 Large Volume Transport Demand - Commodity $26,008.79 31.4% $34,182.25 Small Volume Transport $3,453.93 7.7% $3,719.56 Small Volume Transport - Balancing $507.54 -1.6% $499.48 Pipeline Corridor 1 $41,282.30 0.00% $41,282.30 *Assumes typical customer using 63 therms per month. Includes no proposed monthly increase in basic service charge. **Assumes typical customer using 305 therms per month. Includes no proposed monthly increase in basic service charge. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140487 WF 867626 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 11 of 18 ,AI Alliant Energy. Notice of proposed gas rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal with the Iowa Utilities Board on October 12, 2023, to adjust customers0gas rates in late 2024. The drivers of our proposed gas rate increase include our investments in our natural gas system by replacing aging materials, installing new inspection and safety equipment and upgrading existing infrastructure to benefit our customers. We are also making investments to enhance our system in light of rising costs that have impacted all industries. This will provide a more secure and reliable energy supply for customers. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 12 of 18 Estimated average monthly gas bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average bill prior to October 2024 Proposed monthly bill increase % effective in October 2024 Average bill beginning in October 2024 Residential" $66.31 5.0% $69.64 Non -Residential General Service— $251.18 2.0% $256.29 Large General Service $10,381.36 4.0% $10,801.13 Contract Demand $38,999.05 10.4% $43,054.80 Large Volume Transport $9,853.80 27.3% $12,542.84 Large Volume Transport Demand - Commodity $26,008.79 31.4% $34,182.25 Small Volume Transport $3,453.93 7.7% $3,719.56 Small Volume Transport - Balancing $507.54 -1.6% $499.48 Pipeline Corridor 1 $41,282.30 0.00% $41,282.30 *Assumes typical customer using 63 therms per month. Includes no proposed monthly increase in basic service charge. **Assumes typical customer using 305 therms per month. Includes no proposed monthly increase in basic service charge. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140490 WF 867690 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 13 of 18 ,AI Alliant Energy. Notice of proposed gas rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal with the Iowa Utilities Board on October 12, 2023, to adjust customers0gas rates in late 2024. The drivers of our proposed gas rate increase include our investments in our natural gas system by replacing aging materials, installing new inspection and safety equipment and upgrading existing infrastructure to benefit our customers. We are also making investments to enhance our system in light of rising costs that have impacted all industries. This will provide a more secure and reliable energy supply for customers. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 14 of 18 Estimated average monthly gas bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average bill prior to October 2024 Proposed monthly bill increase % effective in October 2024 Average bill beginning in October 2024 Residential" $66.31 5.0% $69.64 Non -Residential General Service— $251.18 2.0% $256.29 Large General Service $10,381.36 4.0% $10,801.13 Contract Demand $38,999.05 10.4% $43,054.80 Large Volume Transport $9,853.80 27.3% $12,542.84 Large Volume Transport Demand - Commodity $26,008.79 31.4% $34,182.25 Small Volume Transport $3,453.93 7.7% $3,719.56 Small Volume Transport - Balancing $507.54 -1.6% $499.48 Pipeline Corridor 1 $41,282.30 0.00% $41,282.30 *Assumes typical customer using 63 therms per month. Includes no proposed monthly increase in basic service charge. **Assumes typical customer using 305 therms per month. Includes no proposed monthly increase in basic service charge. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140491 WF 867754 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 15 of 18 ,AI Alliant Energy. Notice of proposed gas rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal with the Iowa Utilities Board on October 12, 2023, to adjust customers0gas rates in late 2024. The drivers of our proposed gas rate increase include our investments in our natural gas system by replacing aging materials, installing new inspection and safety equipment and upgrading existing infrastructure to benefit our customers. We are also making investments to enhance our system in light of rising costs that have impacted all industries. This will provide a more secure and reliable energy supply for customers. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 16 of 18 Estimated average monthly gas bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average bill prior to October 2024 Proposed monthly bill increase % effective in October 2024 Average bill beginning in October 2024 Residential" $66.31 5.0% $69.64 Non -Residential General Service— $251.18 2.0% $256.29 Large General Service $10,381.36 4.0% $10,801.13 Contract Demand $38,999.05 10.4% $43,054.80 Large Volume Transport $9,853.80 27.3% $12,542.84 Large Volume Transport Demand - Commodity $26,008.79 31.4% $34,182.25 Small Volume Transport $3,453.93 7.7% $3,719.56 Small Volume Transport - Balancing $507.54 -1.6% $499.48 Pipeline Corridor 1 $41,282.30 0.00% $41,282.30 *Assumes typical customer using 63 therms per month. Includes no proposed monthly increase in basic service charge. **Assumes typical customer using 305 therms per month. Includes no proposed monthly increase in basic service charge. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140492 WF 867818 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 17 of 18 ,AI Alliant Energy. Notice of proposed gas rate increase Alliant Energy[R; Iowa utility, Interstate Power and Light Company, is submitting a proposal with the Iowa Utilities Board on October 12, 2023, to adjust customers0gas rates in late 2024. The drivers of our proposed gas rate increase include our investments in our natural gas system by replacing aging materials, installing new inspection and safety equipment and upgrading existing infrastructure to benefit our customers. We are also making investments to enhance our system in light of rising costs that have impacted all industries. This will provide a more secure and reliable energy supply for customers. The overall impact on customer bills will vary, depending on actual energy used and final rates approved by the Iowa Utilities Board. The Iowa Utilities Board will review our request within 10 months and establish final rates, which may be different than the rates we're proposing. We're requesting the rates become effective in October 2024. However, the Iowa Utilities Board will determine if and when any changes in final rates become effective. The rates under review by the Iowa Utilities Board are called base rates and only account for a portion of your bill. Base rates include capital costs, operation and maintenance costs, a return on investment and taxes. The estimated average monthly bill shown in the chart on the next page includes all costs included for a typical customerl� bill, including estimated rate case expense. The estimated average monthly bill is based on projections and may be impacted by other factors, such as fuel costs and weather. Did you know? Your bill consists of two primary elements 0 the cost of energy and the amount of energy you use. To learn about ways you can reduce the amount of energy you use and save on your bill, visit alliantenergy.com/waystosave. You can also learn about resources available to help manage your bill by visiting alliantenergy.com/energyassistance. Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Attachment B Page 18 of 18 Estimated average monthly gas bill impacts for a typical customer The highlighted row represents the customer type listed for your account. Customer type Average bill prior to October 2024 Proposed monthly bill increase % effective in October 2024 Average bill beginning in October 2024 Residential" $66.31 5.0% $69.64 Non -Residential General Service— $251.18 2.0% $256.29 Large General Service $10,381.36 4.0% $10,801.13 Contract Demand $38,999.05 10.4% $43,054.80 Large Volume Transport $9,853.80 27.3% $12,542.84 Large Volume Transport Demand - Commodity $26,008.79 31.4% $34,182.25 Small Volume Transport $3,453.93 7.7% $3,719.56 Small Volume Transport - Balancing $507.54 -1.6% $499.48 Pipeline Corridor 1 $41,282.30 0.00% $41,282.30 *Assumes typical customer using 63 therms per month. Includes no proposed monthly increase in basic service charge. **Assumes typical customer using 305 therms per month. Includes no proposed monthly increase in basic service charge. Customers have the right to file written comments and objections with the Iowa Utilities Board that include any facts that would assist the Board in reviewing the proposed rate adjustment. Customers also have the right to request a public hearing regarding the proposed new rates. Comments, objections, or hearing requests can be submitted to the Iowa Utilities Board online at efs.iowa.gov, by email at customer@iub.iowa.gov or by mail at Iowa Utilities Board, 1375 E. Court Avenue, Des Moines, IA 50319-0069. All comments are a matter of public record and available to the Office of Consumer Advocate, who represents the public interest in rate cases before the Iowa Utilities Board. As part of this request, the Iowa Utilities Board will host a series of customer comment meetings. The customer comment meetings are open to the public and are scheduled for the dates below. Details about participating or accessing information presented at the customer comment meetings will be available on the Iowa Utilities Board website, iub.iowa.gov. Cedar Rapids: Monday, November 6 (6:30 p.m.) at The Hotel at Kirkwood Center, Main Ballroom, 7725 Kirkwood Blvd SW, Cedar Rapids, IA 52404. Clear Lake: Tuesday, November 7 (6 p.m.) at The Surf Ballroom, 460 North Shore Dr., Clear Lake, IA 50428. Creston: Wednesday, November 8 (6 p.m.) at Southwestern Community College, Performing Arts Center, 1501 W Townline St., Creston, IA 50801. Virtual: Thursday, November 9 (6 p.m.) at iub.iowa.gov. To learn more about Alliant Energyl� rates, visit alliantenergy.com/iowarates. A free, written explanation of current and proposed rates can be provided upon request. If you have any questions, you may call Alliant Energy at 1-800-ALLIANT (800-255-4268). The proposal reflects our ongoing commitment to continue to deliver safe and reliable energy to our customers. © 2023 Alliant Energy 13140493 WF 867882 9/23 MJ Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Residential General Service Large Gen. Service LGS - Supplemental High Load/Bulk Lighting Standby Subtotal Customers kWh Base Revenue RTS Revenue RER Revenue ECA Revenue EECR Revenue Total Revenue Phase 1 Phase 2 (over Phase 1) Total Phase 1 Total Phase 2 Total Both Total Average Bill 412,033 3,650,454,762 $412,974,170 $137,114,362 $10,962,264 $65,215,707 $17,704,798 $643,971,301 $ 49,656,279 $ 36,357,018 $ 86,013,297 7.71% 5.65% 13.36% $ 147.64 82,311 1,972,215,109 $191,081,911 $81,698,439 $5,922,534 $35,233,803 $7,592,453 $321,529,140 $ 35,667,591 $ 28,638,237 $ 64,305,828 11.09% 8.91% 20.00% $ 390.63 2,826 6,224,753,427 $289,282,988 $148,695,133 $18,692,847 $111,205,787 $11,720,996 $579,597,750 $ 56,723,944 $ 44,323,574 $ 101,047,518 9.79% 7.65% 17.43% 1 $ 20,071.65 105 397,458,695 $15,586,952 $8,696,304 $1,193,563 $7,100,636 $747,990 $33,325,445 $ 3,696,829 $ 2,968,260 $ 6,665,089 11.09% 8.91% 20.00% $ 31,738.52 5 1,875,788,213 $40,663,365 $35,776,379 $5,632,966 $33,511,127 $3,530,800 $119,114,637 $ 13,167,825 $ 10,565,346 $ 23,733,171 11.05% 8.87% 19.92% $ 2,380,796.80 5,652 50,309,249 $16,982,253 $1,899,548 $151,078 $898,779 $179,164 $20,110,821 $ (0) $ - $ (0) 0.00% 0.00% 0.00% $ 296.51 5 103,816,189 $3,037,621 $11,342,812 $311,759 $1,854,686 $195,642 $16,742,519 $ 1,175,572 $ 833,936 $ 2,009,508 7.02% 4.98% 12.00% $ 312,533.78 502,937 14,274,795,644 $969,609,260 $ 425,222,976 $ 42,867,011 $ 255,020,524 $ 41,671,842 $1,734,391,613 $ 160,088,040 1 $ 123,686,371 $283,774,411 Source: IPL lano Direct Exhibit 2 Final and IPL lano Direct Exhibit 3 Final Current Base Rates Phase 1 Base Rates Phase 2 Base Rates $0.11 $ 0.01 $ 0.01 $0.10 $ 0.02 $ 0.01 $0.05 $ 0.01 $ 0.01 $0.04 $ 0.01 $ 0.01 $0.02 1 $ 0.01 1 $ 0.01 $0.34 1 $ (0.00) $ - $0.03 1 $ 0.011 $ 0.01 INTERSTATE POWER AND LIGHT COMPANY IOWA NATURAL GAS UTILITY TEST YEAR ENDING SEPTEMBER 30, 2025 Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Proposed Monthly FINAL Base Rate Changes (2024 Forward) Customer Class Typical Monthly Bill from 2023 Typical Monthly Bill Typical Overall Change % Residential $66.31 $69.64 5.0% General Service $251.18 $256.29 2.0% Large General Service $10,381.36 $10,801.13 4.0% LGS-Contract Demand $38,999.05 $43,054.80 10.4% Transportation -Small $3,453.93 $3,719.56 7.7% Transportation -Large $9,853.80 $12,351.72 25.3% Transp.-Large Dmd-Corn $26,008.79 $34,182.25 31.4% Transp.-Small Vol. Bal. $507.54 $499.48 -1.6% Transp.-Pipeline Cor. $41,282.30 $41,282.30 0.0% Filed with the Iowa Utilities Board on October 6, 2023, RPU-2023-0002 Residential General Service Large General Service LGS-Contract Demand Transportation -Small Transportation -Large Transp.-Large Dmd-Com Transp.-SmallVol. Bal. Transp.-Pipeline Cor. Transp.-RNG Non-Fuel/EECR EECR Customers Dth Fuel Revenue Total Revenue Revenue Revenue 201,251 15,209,522 $77,793,374 $78,934,857 $3,411,226 $160,139,457 24,476 8,963,705 $27,971,306 $45,556,708 $247,244 $73,775,257 99 2,465,541 $2,128,624 $10,108,347 $44,174 $12,281,144 2 6,429,918 $935,977 $0 $0 $935,977 68 1,302,752 $2,832,222 $0 $0 $2,832,222 90 13,357,803 $10,612,539 $0 $0 $10,612,539 10 4,869,326 $3,121,055 $0 $0 $3,121,055 719 1,671,628 $4,229,003 $0 $152,118 $4,381,121 8 17,795,141 $3,963,101 $0 $0 $3,963,101 1 1,182,258 $928,408 $0 $0 $928,408 Total Increase $ Total Increase % Base Increase % $ 8,038,662 5.02% 10.33% $ 1,499,788 2.03% 5.36% $ 496,589 4.04% 23.33% $ 97,338 10.40% 10.40% $ 217,820 7.69% 7.69% $ 2,690,262 25.35% 25.35% $ 980,815 31.43% 31.43% $ (69,582) -1.59% -1.65% $ - 0.00% 0.00% $ 238,107 25.65% 25.65% 226,723 72,065,337 133,587,199 134,599,912 3,854,762 272,041,872 $ 13,951,692 Source: IPL Schmidt Direct Exhibit 3 and IPL Schmidt Direct Exhibit 4 Current Base Phase 1 Rates Base Rates $0.51 $0.05285 $0.31 $0.01673 $0.09 $0.02014 $0.01 $0.00151 $0.22 $0.01672 $0.08 $0.02014 $0.06 $0.02014 $0.25 ($0.00416) $0.02 $0.00000 $0.08 $0.02014 New Average Bill $ 69.64 $ 256.29 $ 10,801.13 $ 43,054.80 $ 3,719.56 $ 12,351.72 $ 34,182.25 $ 499.48 $ 41,282.30 $ 97,209.60