Summary of Significant Accounting Policies (Policy)

3 Months Ended

Mar. 31, 2026

Significant Accounting Policies [Line Items]

Inventories

Inventories consist of materials and supplies as of March 31, 2026 and December 31, 2025.

DP&L, which does business as AES Ohio, is a public utility incorporated in 1911 under the laws of Ohio. Beginning in 2001, Ohio law gave consumers the right to choose the electric generation supplier from whom they purchase retail generation service; however, retail transmission and distribution services are still regulated. AES Ohio has the exclusive right to provide such transmission and distribution services to its approximately 540,000 customers located in West Central Ohio. Principal industries located in AES Ohio’s service territory include automotive, food processing, paper, plastic, manufacturing and defense. AES Ohio also provides retail SSO electric service to residential, commercial, industrial and governmental customers in a 6,000-square mile area of West Central Ohio. AES Ohio sources all of the generation for its SSO customers through a competitive bid process. AES Ohio's sales reflect the general economic conditions, seasonal weather patterns of the area, the market price of electricity and customer energy efficiency initiatives. AES Ohio owns numerous transmission facilities. AES Ohio records revenue and expenses for its proportional share of energy and capacity from its investment in OVEC. AES Ohio has one reportable segment, the Utility segment. In addition to AES Ohio's electric transmission and distribution businesses, the Utility segment includes revenue and expenses associated with AES Ohio's investment in OVEC. AES Ohio is an indirect majority-owned subsidiary of DPL.

AES Ohio’s electric transmission and distribution businesses are subject to rate regulation by federal and state regulators. Accordingly, AES Ohio applies the accounting standards for regulated operations to its electric transmission and distribution businesses and records regulatory assets when incurred costs are expected to be recovered in future customer rates and regulatory liabilities when current cost recoveries in customer rates relate to expected future costs or overcollections of riders.

Proposed AES Merger

On March 1, 2026, AES entered into an Agreement and Plan of Merger (the “Merger Agreement”), by and among AES, Horizon Parent, L.P., a Delaware limited partnership (“Parent”), and Horizon Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Parent (“Merger Sub”). Pursuant to the Merger Agreement, Merger Sub will merge with and into AES (the “Merger”), with AES continuing as the surviving corporation in the Merger. Parent is controlled by investment vehicles affiliated with one or more funds, accounts or other entities managed or advised by Global Infrastructure Management, LLC and the EQT Infrastructure VI fund. Consummation of the Merger is subject to various closing conditions, including regulatory approval from the PUCO. See Note 2. Regulatory Matters - AES Ohio Merger Application for further details.

Financial Statement Presentation

AES Ohio does not have any subsidiaries. We have evaluated subsequent events through the date this report was issued.

Interim Financial Presentation

The accompanying unaudited condensed financial statements and footnotes have been prepared in accordance with GAAP, as contained in the FASB ASC, for interim financial information and Article 10 of Regulation S-X issued by the SEC. Accordingly, they do not include all the information and footnotes required by GAAP for annual fiscal reporting periods. In the opinion of management, the interim financial information includes all adjustments of a normal recurring nature necessary for a fair presentation of the results of operations, financial position, comprehensive income or loss, changes in shareholder's equity, and cash flows. The results of operations for the three months ended March 31, 2026 are not necessarily indicative of expected results for the year ending December 31, 2026. The accompanying condensed financial statements are unaudited and should be read in conjunction with the 2025 audited financial statements and footnotes thereto, which are included in our Form 10-K.

Accounting for Taxes Collected from Customers and Remitted to Governmental Authorities

AES Ohio collects certain excise taxes levied by state or local governments from its customers. These taxes are accounted for on a net basis and not included in revenue. The amounts of such taxes collected for the three months ended March 31, 2026 and 2025 were as follows:


	Three months ended
	March 31,
$ in millions		2026		2025
Excise taxes collected		$	12.9	$	13.2

Recently Issued Accounting Standards

New Accounting Pronouncements Issued But Not Yet Effective

The following table provides a brief description of recent accounting pronouncements that could have an impact on our financial statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or are expected to have no material impact on our financial statements.


ASU Number and Name	Description	Date of Adoption	Effect on the financial statements upon adoption
2024-03: Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40)	The amendments in this Update require disclosure, in the notes to financial statements, of specified information about certain costs and expenses. The amendments require that at each interim and annual reporting period an entity: 1. Disclose the amounts of (a) purchases of inventory, (b) employee compensation, (c) depreciation, (d) intangible asset amortization, and (e) depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities (DD&A) (or other amounts of depletion expense) included in each relevant expense caption. A relevant expense caption is an expense caption presented on the face of the income statement within continuing operations that contains any of the expense categories listed in (a)–(e). 2. Include certain amounts that are already required to be disclosed under current generally accepted accounting principles (GAAP) in the same disclosure as the other disaggregation requirements. 3. Disclose a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. 4. Disclose the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses.	The date for each amendment in this Update is effective for fiscal years beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted.	We are currently evaluating the impact of adopting the standard on our financial statements. This ASU only affects disclosures, which will be provided when the amendment becomes effective.
2025-06: Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software	The amendments in this Update remove all references to prescriptive and sequential software development stages (referred to as “project stages”) throughout Subtopic 350-40. Therefore, an entity is required to start capitalizing software costs when both of the following occur: 1. Management has authorized and committed to funding the software project. 2. It is probable that the project will be completed and the software will be used to perform the function intended. In evaluating the probable-to-complete recognition threshold, an entity is required to consider whether there is significant uncertainty associated with the development activities of the software. The two factors to consider in determining whether there is significant development uncertainty are whether: 1. The software being developed has technological innovations or novel, unique, or unproven functions or features, and the uncertainty related to those technological innovations, functions, or features, if identified, has not been resolved through coding and testing. 2. The entity has determined what it needs the software to do (for example, functions or features), including whether the entity has identified or continues to substantially revise the software’s significant performance requirements.	The amendments in this Update are effective for fiscal years beginning after December 15, 2027, and interim reporting periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period.	We are currently evaluating the impact of adopting the standard on our financial statements.


2025-09: Hedge Accounting Improvements	Issue 1: Similar Risk Assessment for Cash Flow Hedges The amendments in this Update permit grouping forecasted transactions in a cash flow hedge based on similar risk exposures, subject to initial and ongoing risk assessments. Issue 2: Hedging Forecasted Interest Payments on Choose‑Your‑Rate Debt The amendments in this Update provide a model to facilitate the application of cash flow hedge accounting for forecasted interest payments on variable‑rate debt that permits borrowers to change the interest rate index and reset frequency (“choose‑your‑rate” debt). Issue 3: Cash Flow Hedges of Nonfinancial Forecasted Transactions The amendments in this Update expand hedge accounting for forecasted purchases and sales of nonfinancial assets by allowing hedging of eligible price components and subcomponents, subject to specific criteria. Issue 4: Net Written Options as Hedging Instruments The amendments in this Update eliminate the requirement to apply the net written option test to compound derivatives consisting of a swap and a written option that are designated as hedging instruments in cash flow or fair value hedges of interest rate risk. Issue 5: Foreign‑Currency‑Denominated Debt Used in Dual Hedges The amendments in this Update eliminate recognition and presentation mismatches in dual hedge strategies by excluding fair value hedge basis adjustments from net investment hedge effectiveness assessments and requiring related foreign exchange gains and losses to be recognized in earnings.	The amendments in this Update are effective for annual reporting periods beginning after December 15, 2026, and interim periods within those annual reporting periods, and should be applied prospectively for all hedging relationships that exist at the date of adoption.	We are currently evaluating the impact of adopting the standard on our financial statements.
2025-11: Interim Reporting (Topic 270)—Narrow-Scope Improvements	The amendments in this Update clarify interim disclosure requirements and the applicability of Topic 270 by organizing existing GAAP interim disclosure requirements into a single framework and clarifying when additional disclosures are required for material events occurring after the most recent annual reporting period.	The amendments in this Update are effective for fiscal years beginning after December 15, 2027, and interim reporting periods within those annual reporting periods.	We are currently evaluating the impact of adopting the standard on our financial statements.
2025-12: Codification Improvements	The amendments in this Update include 33 issues that represent changes to the Codification that clarify, correct errors, or make minor improvements, making the Codification easier to understand and apply. The amendments in this Update are varied in nature and may affect the application of guidance in cases in which the original guidance may have been unclear.	The amendments in this Update are effective for fiscal years beginning after December 15, 2026, and interim reporting periods within those annual reporting periods. Early adoption is permitted on an issue-by-issue basis as of the beginning of an annual reporting period.	We are currently evaluating the impact of adopting the standard on our financial statements.

- Definition

Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost.

+ References + Details