Regulatory Matters	3 Months Ended
Mar. 31, 2026
Regulated Operations [Abstract]
Regulatory Matters	2. REGULATORY MATTERS Regulatory Rate Review On June 3, 2025, AES Indiana filed a petition with the IURC for authority to increase its basic rates and charges to cover the rising operational costs and needs associated with continuing to serve its customers safely and reliably. The factors leading to AES Indiana’s base rate increase request include inflationary impacts on operations and maintenance expenses and continued investments in generation, transmission and distribution assets. AES Indiana is also seeking recovery of increased costs to support its vegetation management plan, storm restoration costs and technology to enhance resiliency and reliability. On October 15, 2025, AES Indiana entered into a Stipulation and Settlement Agreement (the “Settlement”) with most parties in AES Indiana's pending regulatory rate review at the IURC. This Settlement provides for updated base rates for electric services in AES Indiana's territory and is subject to, and conditioned upon, approval by the IURC. Among other things, the Settlement proposes an increase in AES Indiana's revenue of $90.7 million and provides a return on common equity of 9.75% and cost of long-term debt of 5.34%, on a rate base of approximately $5.5 billion for AES Indiana's 2027 electric service base rates. The partial settlement agreement also includes a commitment to not implement additional base rate increases, following the implementation of new base rates under the Settlement, until at least January of 2030 and to not start a second TDSIC Plan before January of 2028. An evidentiary hearing with the IURC was held on January 28 and 29, 2026, and AES Indiana anticipates a final order from the IURC in the second quarter of 2026. HEA 1007 - Large Load Customer Project Filing On April 22, 2026, AES Indiana filed a petition and case in chief seeking IURC approval related to certain generation resources and energy infrastructure investments required to serve increasing demand in AES Indiana's service territory, primarily driven by the anticipated demand for a new data center campus to be located in Monrovia, Indiana, which is being developed by a subsidiary of Alphabet, Inc. (the “Customer”). This energy infrastructure and generation resources primarily required to serve the Customer is referred to as the "Monrovia Project". AES Indiana is also seeking approval of various accounting and ratemaking requests associated with the Monrovia Project. As part of developing this comprehensive plan, AES Indiana has incorporated certain protections for existing and future customers that ensure the costs of the generation resources and energy infrastructure upgrades required benefit all customers, are fairly allocated, and follow cost causation/beneficiary pays regulatory principles. The petition includes AES Indiana's plan to serve this increasing demand through the acquisition and development of additional generation resources, including solar and energy storage projects, sufficient to provide 390 MW of new load by the end of 2029. AES Indiana is seeking approval to acquire two development stage projects located in Indiana, including i) Crosstrack, a 130 MW solar and 130 MW (520 MWh) energy storage project in Pike County with a planned in-service date in late 2028 and ii) Foundry Works, a 200 MW (800 MWh) energy storage project in Lake County with a planned in-service date in mid-2028. Additionally, AES Indiana is seeking approval to develop and construct a 130 MW (520 MWh) energy storage project at its existing Hardy Hills renewable facility in Clinton County with a planned in-service date in March 2029. The petition also includes AES Indiana's plan to develop and construct specific transmission network upgrades and enhancements required to serve the increasing demand, including seeking approval of a construction service agreement executed with the Customer. AES Indiana is also seeking approval of an electric services agreement ("ESA") executed with the Customer to provide high-voltage retail electric service to the new data center campus, which includes financial assurances, minimum demand commitments, and exit provisions as protections for existing customers. The rates and charges that the Customer will pay under these agreements will be sufficient to reimburse AES Indiana for the incremental annual revenue requirement associated with the Monrovia Project. At full demand, AES Indiana estimates the ESA will provide over $770 million in benefits, which AES Indiana proposes to return to existing customers through its various rate adjustment mechanisms. As such, the Monrovia Project is consistent with both state and federal policy framework for serving large load customers, including President Trump’s Ratepayer Protection Pledge. AES Indiana anticipates a final order from the IURC in the fourth quarter of 2026.

On June 3, 2025, AES Indiana filed a petition with the IURC for authority to increase its basic rates and charges to cover the rising operational costs and needs associated with continuing to serve its customers safely and reliably. The factors leading to AES Indiana’s base rate increase request include inflationary impacts on operations and maintenance expenses and continued investments in generation, transmission and distribution assets. AES Indiana is also seeking recovery of increased costs to support its vegetation management plan, storm restoration costs and technology to enhance resiliency and reliability. On October 15, 2025, AES Indiana entered into a Stipulation and Settlement Agreement (the “Settlement”) with most parties in AES Indiana's pending regulatory rate review at the IURC. This Settlement provides for updated base rates for electric services in AES Indiana's territory and is subject to, and conditioned upon, approval by the IURC. Among other things, the Settlement proposes an increase in AES Indiana's revenue of $90.7 million and provides a return on common equity of 9.75% and cost of long-term debt of 5.34%, on a rate base of approximately $5.5 billion for AES Indiana's 2027 electric service base rates. The partial settlement agreement also includes a commitment to not implement additional base rate increases, following the implementation of new base rates under the Settlement, until at least January of 2030 and to not start a second TDSIC Plan before January of 2028. An evidentiary hearing with the IURC was held on January 28 and 29, 2026, and AES Indiana anticipates a final order from the IURC in the second quarter of 2026.

On April 22, 2026, AES Indiana filed a petition and case in chief seeking IURC approval related to certain generation resources and energy infrastructure investments required to serve increasing demand in AES Indiana's service territory, primarily driven by the anticipated demand for a new data center campus to be located in Monrovia, Indiana, which is being developed by a subsidiary of Alphabet, Inc. (the “Customer”). This energy infrastructure and generation resources primarily required to serve the Customer is referred to as the "Monrovia Project". AES Indiana is also seeking approval of various accounting and ratemaking requests associated with the Monrovia Project. As part of developing this comprehensive plan, AES Indiana has incorporated certain protections for existing and future customers that ensure the costs of the generation resources and energy infrastructure upgrades required benefit all customers, are fairly allocated, and follow cost causation/beneficiary pays regulatory principles.

The petition includes AES Indiana's plan to serve this increasing demand through the acquisition and development of additional generation resources, including solar and energy storage projects, sufficient to provide 390 MW of new load by the end of 2029. AES Indiana is seeking approval to acquire two development stage projects located in Indiana, including i) Crosstrack, a 130 MW solar and 130 MW (520 MWh) energy storage project in Pike County

with a planned in-service date in late 2028 and ii) Foundry Works, a 200 MW (800 MWh) energy storage project in Lake County with a planned in-service date in mid-2028. Additionally, AES Indiana is seeking approval to develop and construct a 130 MW (520 MWh) energy storage project at its existing Hardy Hills renewable facility in Clinton County with a planned in-service date in March 2029.

The petition also includes AES Indiana's plan to develop and construct specific transmission network upgrades and enhancements required to serve the increasing demand, including seeking approval of a construction service agreement executed with the Customer. AES Indiana is also seeking approval of an electric services agreement ("ESA") executed with the Customer to provide high-voltage retail electric service to the new data center campus, which includes financial assurances, minimum demand commitments, and exit provisions as protections for existing customers. The rates and charges that the Customer will pay under these agreements will be sufficient to reimburse AES Indiana for the incremental annual revenue requirement associated with the Monrovia Project. At full demand, AES Indiana estimates the ESA will provide over $770 million in benefits, which AES Indiana proposes to return to existing customers through its various rate adjustment mechanisms. As such, the Monrovia Project is consistent with both state and federal policy framework for serving large load customers, including President Trump’s Ratepayer Protection Pledge.