Regulatory Matters (Notes)	3 Months Ended
Mar. 31, 2023
Schedule of Regulatory Assets and Liabilities [Text Block]	REGULATORY MATTERS AES Ohio ESPs and Comprehensive Settlement AES Ohio ESP – Ohio law requires utilities to file either an ESP or MRO plan to establish SSO rates. From November 1, 2017 through December 18, 2019, AES Ohio operated pursuant to an approved ESP, which was initially approved on October 20, 2017 (ESP 3). On December 18, 2019, the PUCO approved AES Ohio's Notice of Withdrawal and reversion to its prior rate plan (ESP 1). Among other items, the PUCO Order approving the ESP 1 rate plan includes reinstating the non-bypassable RSC Rider, which provides annual revenues of approximately $79.0 million. The OCC has appealed to the Ohio Supreme Court the PUCO's decision approving the reversion to ESP 1 as well as argued for a refund of the RSC revenues dating back to August 2021. A decision is pending. We are unable to predict the outcome of this appeal, but if this results in terms that are more adverse than AES Ohio's current ESP rate plan, it could have a material adverse effect on our results of operations, financial condition and cash flows. Comprehensive Settlement - On October 23, 2020, AES Ohio entered into a Stipulation and Recommendation with the staff of the PUCO, various customers and organizations representing customers of AES Ohio and certain other parties with respect to, among other matters, AES Ohio's applications pending at the PUCO for (i) approval of AES Ohio's plan to modernize its distribution grid (the Smart Grid Plan), (ii) findings that DP&L passed the SEET for 2018 and 2019, and (iii) findings that AES Ohio's current ESP 1 satisfies the SEET and the more favorable in the aggregate (MFA) regulatory test. On June 16, 2021, the PUCO issued their opinion and order accepting the stipulation as filed. The OCC appealed the final PUCO order to the Ohio Supreme Court on December 6, 2021. Oral arguments regarding this appeal are expected but not yet scheduled. ESP 4 – AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability, provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the RSC would continue as part of ESP 4. On April 10, 2023, AES Ohio entered into a Stipulation and Recommendation with the PUCO Staff and seventeen parties (the “Settlement”) with respect to AES Ohio’s ESP 4 application, pending at the PUCO. The Settlement is subject to, and conditioned upon, approval by the PUCO. The Settlement would provide for a three-year ESP without a rate stability charge, and, in addition to other items, provides for the following: •A Distribution Investment Rider for the term of the ESP allowing for the timely recovery of distribution investments by AES Ohio based on a 9.999% return on equity, subject to revenue caps; •The recovery of approximately $66.0 million related to past expenditures by AES Ohio plus future carrying costs and the recovery of incremental vegetation management expenses up to certain annual limits during the term of ESP 4; and •Funding of programs for assistance to low-income customers and for economic development. Upon approval of this Settlement, the distribution rates that were approved by the PUCO in December 2022, and are described in the paragraph below, will become effective. An evidentiary hearing began May 2, 2023, and AES Ohio expects an order by the PUCO in the third quarter of 2023. Distribution Rate Case On November 30, 2020, AES Ohio filed a new distribution rate case application with the PUCO to increase AES Ohio’s base rates for electric distribution service to address, in part, increased costs of materials and labor and substantial investments to improve distribution structures. On December 14, 2022, the PUCO issued an order on the application. Among other matters, the order: •Establishes a revenue increase of $75.6 million for AES Ohio’s base rates for electric distribution service and •Provides for a return on equity of 9.999% and a cost of long-term debt of 4.4% on a distribution rate base of $783.5 million and based on a capital structure of 53.87% equity and 46.13% long-term debt. As noted above, these rates will go into effect when the PUCO approves AES Ohio's Settlement regarding ESP 4.
Subsidiaries [Member]
Schedule of Regulatory Assets and Liabilities [Text Block]	REGULATORY MATTERS AES Ohio ESPs and Comprehensive Settlement AES Ohio ESP – Ohio law requires utilities to file either an ESP or MRO plan to establish SSO rates. From November 1, 2017 through December 18, 2019, AES Ohio operated pursuant to an approved ESP, which was initially approved on October 20, 2017 (ESP 3). On December 18, 2019, the PUCO approved AES Ohio's Notice of Withdrawal and reversion to its prior rate plan (ESP 1). Among other items, the PUCO Order approving the ESP 1 rate plan includes reinstating the non-bypassable RSC Rider, which provides annual revenues of approximately $79.0 million. The OCC has appealed to the Ohio Supreme Court the PUCO's decision approving the reversion to ESP 1 as well as argued for a refund of the RSC revenues dating back to August 2021. A decision is pending. We are unable to predict the outcome of this appeal, but if this results in terms that are more adverse than AES Ohio's current ESP rate plan, it could have a material adverse effect on our results of operations, financial condition and cash flows. Comprehensive Settlement - On October 23, 2020, AES Ohio entered into a Stipulation and Recommendation with the staff of the PUCO, various customers and organizations representing customers of AES Ohio and certain other parties with respect to, among other matters, AES Ohio's applications pending at the PUCO for (i) approval of AES Ohio's plan to modernize its distribution grid (the Smart Grid Plan), (ii) findings that DP&L passed the SEET for 2018 and 2019, and (iii) findings that AES Ohio's current ESP 1 satisfies the SEET and the more favorable in the aggregate (MFA) regulatory test. On June 16, 2021, the PUCO issued their opinion and order accepting the stipulation as filed. The OCC appealed the final PUCO order to the Ohio Supreme Court on December 6, 2021. Oral arguments regarding this appeal are expected but not yet scheduled. ESP 4 – AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability, provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the RSC would continue as part of ESP 4. On April 10, 2023, AES Ohio entered into a Stipulation and Recommendation with the PUCO Staff and seventeen parties (the “Settlement”) with respect to AES Ohio’s ESP 4 application, pending at the PUCO. The Settlement is subject to, and conditioned upon, approval by the PUCO. The Settlement would provide for a three-year ESP without a rate stability charge, and, in addition to other items, provides for the following: •A Distribution Investment Rider for the term of the ESP allowing for the timely recovery of distribution investments by AES Ohio based on a 9.999% return on equity, subject to revenue caps; •The recovery of approximately $66.0 million related to past expenditures by AES Ohio plus future carrying costs and the recovery of incremental vegetation management expenses up to certain annual limits during the term of ESP 4; and •Funding of programs for assistance to low-income customers and for economic development. Upon approval of this Settlement, the distribution rates that were approved by the PUCO in December 2022, and are described in the paragraph below, will become effective. An evidentiary hearing began May 2, 2023, and AES Ohio expects an order by the PUCO in the third quarter of 2023. Distribution Rate Case On November 30, 2020, AES Ohio filed a new distribution rate case application with the PUCO to increase AES Ohio’s base rates for electric distribution service to address, in part, increased costs of materials and labor and substantial investments to improve distribution structures. On December 14, 2022, the PUCO issued an order on the application. Among other matters, the order: •Establishes a revenue increase of $75.6 million for AES Ohio’s base rates for electric distribution service and •Provides for a return on equity of 9.999% and a cost of long-term debt of 4.4% on a distribution rate base of $783.5 million and based on a capital structure of 53.87% equity and 46.13% long-term debt. As noted above, these rates will go into effect when the PUCO approves AES Ohio's Settlement regarding ESP 4.

Regulatory Matters (Notes)

3 Months Ended

Mar. 31, 2023

Schedule of Regulatory Assets and Liabilities [Text Block]

REGULATORY MATTERS

AES Ohio ESPs and Comprehensive Settlement

AES Ohio ESP – Ohio law requires utilities to file either an ESP or MRO plan to establish SSO rates. From November 1, 2017 through December 18, 2019, AES Ohio operated pursuant to an approved ESP, which was initially approved on October 20, 2017 (ESP 3). On December 18, 2019, the PUCO approved AES Ohio's Notice of Withdrawal and reversion to its prior rate plan (ESP 1). Among other items, the PUCO Order approving the ESP 1 rate plan includes reinstating the non-bypassable RSC Rider, which provides annual revenues of approximately $79.0 million. The OCC has appealed to the Ohio Supreme Court the PUCO's decision approving the reversion to ESP 1 as well as argued for a refund of the RSC revenues dating back to August 2021. A decision is pending. We are unable to predict the outcome of this appeal, but if this results in terms that are more adverse than AES Ohio's current ESP rate plan, it could have a material adverse effect on our results of operations, financial condition and cash flows.

Comprehensive Settlement - On October 23, 2020, AES Ohio entered into a Stipulation and Recommendation with the staff of the PUCO, various customers and organizations representing customers of AES Ohio and certain other parties with respect to, among other matters, AES Ohio's applications pending at the PUCO for (i) approval of AES Ohio's plan to modernize its distribution grid (the Smart Grid Plan), (ii) findings that DP&L passed the SEET for 2018 and 2019, and (iii) findings that AES Ohio's current ESP 1 satisfies the SEET and the more favorable in the aggregate (MFA) regulatory test. On June 16, 2021, the PUCO issued their opinion and order accepting the stipulation as filed. The OCC appealed the final PUCO order to the Ohio Supreme Court on December 6, 2021. Oral arguments regarding this appeal are expected but not yet scheduled.

ESP 4 – AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability, provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the RSC would continue as part of ESP 4.

On April 10, 2023, AES Ohio entered into a Stipulation and Recommendation with the PUCO Staff and seventeen parties (the “Settlement”) with respect to AES Ohio’s ESP 4 application, pending at the PUCO. The Settlement is subject to, and conditioned upon, approval by the PUCO. The Settlement would provide for a three-year ESP without a rate stability charge, and, in addition to other items, provides for the following:

•A Distribution Investment Rider for the term of the ESP allowing for the timely recovery of distribution investments by AES Ohio based on a 9.999% return on equity, subject to revenue caps;

•The recovery of approximately $66.0 million related to past expenditures by AES Ohio plus future carrying costs and the recovery of incremental vegetation management expenses up to certain annual limits during the term of ESP 4; and

•Funding of programs for assistance to low-income customers and for economic development.

Upon approval of this Settlement, the distribution rates that were approved by the PUCO in December 2022, and are described in the paragraph below, will become effective. An evidentiary hearing began May 2, 2023, and AES Ohio expects an order by the PUCO in the third quarter of 2023.

Distribution Rate Case

On November 30, 2020, AES Ohio filed a new distribution rate case application with the PUCO to increase AES Ohio’s base rates for electric distribution service to address, in part, increased costs of materials and labor and substantial investments to improve distribution structures. On December 14, 2022, the PUCO issued an order on the application. Among other matters, the order:

•Establishes a revenue increase of $75.6 million for AES Ohio’s base rates for electric distribution service and

•Provides for a return on equity of 9.999% and a cost of long-term debt of 4.4% on a distribution rate base of $783.5 million and based on a capital structure of 53.87% equity and 46.13% long-term debt.

As noted above, these rates will go into effect when the PUCO approves AES Ohio's Settlement regarding ESP 4.

Subsidiaries [Member]

Schedule of Regulatory Assets and Liabilities [Text Block]

REGULATORY MATTERS

AES Ohio ESPs and Comprehensive Settlement

parties with respect to, among other matters, AES Ohio's applications pending at the PUCO for (i) approval of AES Ohio's plan to modernize its distribution grid (the Smart Grid Plan), (ii) findings that DP&L passed the SEET for 2018 and 2019, and (iii) findings that AES Ohio's current ESP 1 satisfies the SEET and the more favorable in the aggregate (MFA) regulatory test. On June 16, 2021, the PUCO issued their opinion and order accepting the stipulation as filed. The OCC appealed the final PUCO order to the Ohio Supreme Court on December 6, 2021. Oral arguments regarding this appeal are expected but not yet scheduled.

•A Distribution Investment Rider for the term of the ESP allowing for the timely recovery of distribution investments by AES Ohio based on a 9.999% return on equity, subject to revenue caps;

•Funding of programs for assistance to low-income customers and for economic development.

Distribution Rate Case

•Establishes a revenue increase of $75.6 million for AES Ohio’s base rates for electric distribution service and

As noted above, these rates will go into effect when the PUCO approves AES Ohio's Settlement regarding ESP 4.