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Overview and Summary of Significant Accounting Policies
12 Months Ended
Dec. 31, 2024
Significant Accounting Policies [Line Items]  
Business Description and Basis of Presentation
DPL, an indirectly wholly-owned subsidiary of AES, is a diversified regional energy company organized in 1985 under the laws of Ohio. DPL owns all of the outstanding common stock of DP&L, which does business as AES Ohio. Substantially all of DPL’s business consists of transmitting, distributing and selling of electric energy conducted through its principal subsidiary, AES Ohio. The terms “we”, “us”, “our” and “ours” are used to refer to DPL and its subsidiaries.

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, transmission and distribution services are still regulated. AES Ohio has the exclusive right to provide such service to its approximately 537,000 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.

DPL’s other primary subsidiaries are MVIC and Miami Valley Lighting. MVIC is our captive insurance company that provides insurance services to AES Ohio and our other subsidiaries, and Miami Valley Lighting provides street and outdoor lighting services to customers in the Dayton region. DPL's subsidiaries are all wholly-owned. DPL also has a wholly-owned business trust, DPL Capital Trust II, formed for the purpose of issuing trust capital securities to investors.

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.

Agreement to Sell Minority Interest in AES Ohio
On September 13, 2024, DPL entered into (i) a Purchase and Sale Agreement with Astrid Holdings LP ("Investor"), a wholly-owned subsidiary of Caisse de dépôt et placement du Québec ("CDPQ"), pursuant to which DPL agreed to sell to Investor 15% of the issued and outstanding shares of common stock, no par value per share, of AES Ohio Holdings, Inc. ("Ohio Holdings" and, such agreement, the "Ohio Holdings Purchase Agreement") for a purchase price of approximately $273 million, subject to adjustment, and (ii) a Purchase and Sale Agreement with Investor, pursuant to which DPL agreed to sell to Investor 17.65% of the issued and outstanding shares of common stock, no par value per share, of AES Ohio Investments, Inc. ("Ohio Investments" and, such agreement, the "Ohio Investments Purchase Agreement" and together with the Ohio Holdings Purchase Agreement, the "Purchase Agreements") for a purchase price of approximately $273 million, subject to adjustment. Upon consummation of the transactions contemplated by the Ohio Holdings Purchase Agreement and the Ohio Investments Purchase Agreement together, the ("Closings"), CDPQ will own an aggregate indirect equity interest in AES Ohio of approximately 30%, with total proceeds to DPL of approximately $546 million, subject to adjustment.

It is anticipated that the Closings will occur on the same day in the first half of 2025. There will be no change in management or operational control of DPL, Ohio Investments, Ohio Holdings or AES Ohio as a result of these transactions.

The purchases and sales of the shares of capital stock of each of Ohio Holdings and Ohio Investments contemplated under each of the Purchase Agreements are subject to the satisfaction of certain customary conditions described in the Purchase Agreements, including, among others, receipt of the approval of the PUCO, the FERC and completion of review by the Committee on Foreign Investments in the United States ("CFIUS"). As of
the filing of this report, approval has been received from the FERC and CFIUS has completed its review. In addition, each of the parties to the Purchase Agreements has agreed to customary covenants therein.

In connection with the Closings, Investor, Ohio Investments and DPL will enter into a Shareholders' Agreement with respect to Ohio Investments (the "Shareholders' Agreement"), the form of which has been agreed to by the parties. The Shareholders' Agreement will establish the general framework governing the relationship between and among Investor and the Company, and their respective successors and transferees, as shareholders of Ohio Investments. In addition, Investor, Ohio Holdings and Ohio Investments will also enter into a Shareholders' Agreement with respect to Ohio Holdings with substantially identical terms.
Overview and Summary of Significant Accounting Policies OVERVIEW AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
DPL, an indirectly wholly-owned subsidiary of AES, is a diversified regional energy company organized in 1985 under the laws of Ohio. DPL owns all of the outstanding common stock of DP&L, which does business as AES Ohio. Substantially all of DPL’s business consists of transmitting, distributing and selling of electric energy conducted through its principal subsidiary, AES Ohio. The terms “we”, “us”, “our” and “ours” are used to refer to DPL and its subsidiaries.

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, transmission and distribution services are still regulated. AES Ohio has the exclusive right to provide such service to its approximately 537,000 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.

DPL’s other primary subsidiaries are MVIC and Miami Valley Lighting. MVIC is our captive insurance company that provides insurance services to AES Ohio and our other subsidiaries, and Miami Valley Lighting provides street and outdoor lighting services to customers in the Dayton region. DPL's subsidiaries are all wholly-owned. DPL also has a wholly-owned business trust, DPL Capital Trust II, formed for the purpose of issuing trust capital securities to investors.

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.

Agreement to Sell Minority Interest in AES Ohio
On September 13, 2024, DPL entered into (i) a Purchase and Sale Agreement with Astrid Holdings LP ("Investor"), a wholly-owned subsidiary of Caisse de dépôt et placement du Québec ("CDPQ"), pursuant to which DPL agreed to sell to Investor 15% of the issued and outstanding shares of common stock, no par value per share, of AES Ohio Holdings, Inc. ("Ohio Holdings" and, such agreement, the "Ohio Holdings Purchase Agreement") for a purchase price of approximately $273 million, subject to adjustment, and (ii) a Purchase and Sale Agreement with Investor, pursuant to which DPL agreed to sell to Investor 17.65% of the issued and outstanding shares of common stock, no par value per share, of AES Ohio Investments, Inc. ("Ohio Investments" and, such agreement, the "Ohio Investments Purchase Agreement" and together with the Ohio Holdings Purchase Agreement, the "Purchase Agreements") for a purchase price of approximately $273 million, subject to adjustment. Upon consummation of the transactions contemplated by the Ohio Holdings Purchase Agreement and the Ohio Investments Purchase Agreement together, the ("Closings"), CDPQ will own an aggregate indirect equity interest in AES Ohio of approximately 30%, with total proceeds to DPL of approximately $546 million, subject to adjustment.

It is anticipated that the Closings will occur on the same day in the first half of 2025. There will be no change in management or operational control of DPL, Ohio Investments, Ohio Holdings or AES Ohio as a result of these transactions.

The purchases and sales of the shares of capital stock of each of Ohio Holdings and Ohio Investments contemplated under each of the Purchase Agreements are subject to the satisfaction of certain customary conditions described in the Purchase Agreements, including, among others, receipt of the approval of the PUCO, the FERC and completion of review by the Committee on Foreign Investments in the United States ("CFIUS"). As of
the filing of this report, approval has been received from the FERC and CFIUS has completed its review. In addition, each of the parties to the Purchase Agreements has agreed to customary covenants therein.

In connection with the Closings, Investor, Ohio Investments and DPL will enter into a Shareholders' Agreement with respect to Ohio Investments (the "Shareholders' Agreement"), the form of which has been agreed to by the parties. The Shareholders' Agreement will establish the general framework governing the relationship between and among Investor and the Company, and their respective successors and transferees, as shareholders of Ohio Investments. In addition, Investor, Ohio Holdings and Ohio Investments will also enter into a Shareholders' Agreement with respect to Ohio Holdings with substantially identical terms.

Financial Statement Presentation
DPL’s Consolidated Financial Statements include the accounts of DPL and its wholly-owned subsidiaries, except for DPL Capital Trust II, which is not consolidated consistent with the provisions of GAAP. All material intercompany accounts and transactions are eliminated in consolidation. We have evaluated subsequent events through the date this report was issued.

Reclassifications
Certain amounts from prior periods have been reclassified to conform to the current period presentation.

Use of Management Estimates
The preparation of consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities and the revenue and expenses of the periods reported. Actual results could differ from these estimates and assumptions. Significant items subject to such estimates and assumptions include: the carrying value of Property, plant and equipment; unbilled revenue; the valuation of allowances for receivables and deferred income taxes; regulatory assets and liabilities; reserves recorded for income tax exposures; litigation; contingencies; and assets and liabilities related to employee benefits.

Cash and Cash Equivalents
Cash and cash equivalents are stated at cost, which approximates fair value. All highly liquid short-term investments with original maturities of three months or less are considered cash equivalents.

Restricted Cash
Restricted cash includes cash which is restricted as to withdrawal or usage. The nature of the restrictions includes restrictions imposed by agreements related to deposits held as collateral.

The following table summarizes cash, cash equivalents and restricted cash amounts reported within the Consolidated Balance Sheets that reconcile to the total of such amounts as shown on the Consolidated Statements of Cash Flows:
December 31,
$ in millions20242023
Cash and cash equivalents$54.0 $41.0 
Restricted cash (included in Prepayments and other current assets)
0.1 0.1 
Total cash, cash equivalents and restricted cash
$54.1 $41.1 

Accounts Receivable and Allowance for Credit Losses
The following table summarizes accounts receivable as of December 31, 2024 and 2023:
December 31,
$ in millions20242023
Accounts receivable, net
Customer receivables$79.8 $71.0 
Unbilled revenue24.1 19.4 
Amounts due from affiliates3.0 0.8 
Other6.0 2.2 
Allowance for credit losses(6.1)(0.9)
Total accounts receivable, net$106.8 $92.5 
The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the years ended December 31, 2024 and 2023:
For the years ended December 31,
$ in millions20242023
Allowance for credit losses:
Beginning balance$0.9 $0.5 
Current period provision8.3 5.4 
Write-offs charged against allowance(3.7)(6.0)
Recoveries collected0.6 1.0 
Ending balance$6.1 $0.9 

The allowance for credit losses primarily relates to utility customer receivables, including unbilled amounts. Expected credit loss estimates are developed by disaggregating customers into those with similar credit risk characteristics and using historical credit loss experience. In addition, we also consider how current and future economic conditions are expected to impact collectability, as applicable, of our receivables balance. Amounts are written off when reasonable collections efforts have been exhausted. During 2024, the current period provision and allowance for credit losses increased due to a temporary pause of customer disconnections and certain collection efforts and write-off processes after the implementation of our customer billing system upgrade in the third quarter of 2024. We currently anticipate reinstituting the customer disconnections process and collection efforts and write-off processes by the end of the third quarter of 2025.

Inventories
Inventories are carried at average cost, net of reserves, and consist of materials and supplies used for utility operations.

Regulatory Accounting
As a regulated utility, AES Ohio applies the provisions of ASC 980 - Regulated Operations, which gives recognition to the ratemaking and accounting practices of the PUCO and the FERC. Regulatory assets generally represent incurred costs that have been deferred because such costs are probable of future recovery in customer rates. Regulatory assets can also represent performance incentives permitted by the regulator. Regulatory assets have been included as allowable costs for ratemaking purposes, as authorized by the PUCO or established regulatory practices. Regulatory liabilities generally represent obligations to make refunds or future rate reductions to customers for previous over collections or the deferral of revenue collected for costs that AES Ohio expects to incur in the future.

The deferral of costs (as regulatory assets) is appropriate only when the future recovery of such costs is probable. In assessing probability, we consider such factors as specific orders from the PUCO or the FERC, regulatory precedent and the current regulatory environment. To the extent recovery of costs is no longer deemed probable, related regulatory assets would be required to be expensed in current period earnings. Our regulatory assets and liabilities have been created pursuant to a specific order of the PUCO or the FERC or established regulatory practices, such as other utilities under the jurisdiction of the PUCO or the FERC being granted recovery of similar costs. It is probable, but not certain, that these regulatory assets will be recoverable, subject to approval by the PUCO or the FERC. Regulatory assets and liabilities are classified as current or non-current based on the term in which recovery is expected. See Note 2. Regulatory Matters for more information.

Property, Plant and Equipment
New property, plant and equipment additions are stated at cost. For regulated transmission and distribution property, cost includes direct labor and material, allocable overhead expenses and AFUDC. AFUDC represents the cost of borrowed funds and equity used to finance regulated construction projects. Capitalization of AFUDC and interest ceases at either project completion or at the date specified by regulators.

For substantially all depreciable property, when a unit of property is retired, the original cost of that property, less any salvage value, is charged to Accumulated depreciation and amortization, consistent with composite depreciation practices. Depreciation expense is calculated using the straight-line method, which allocates the cost of property over its estimated useful life. For DPL’s transmission and distribution assets, straight-line depreciation is applied monthly on an average composite basis using group rates. Depreciation and amortization expense in the Consolidated Statements of Operations is presented net of regulatory deferrals of depreciation expense and also
includes amortization of intangible assets and amortization of previously deferred regulatory costs. The following table presents average composite group rates and depreciation expense for each respective period.
Years ended December 31,
$ in millions202420232022
Composite group rates2.9 %3.2 %3.3 %
Depreciation expense$85.4 $78.0 $76.7 

AES Ohio may receive contributions in aid of construction ("CIAC") from customers that are intended to defray all or a portion of the costs for certain capital projects, to the extent the project does not benefit regulated customers in general. AES Ohio accounts for CIAC as a reduction to property, plant and equipment.

AFUDC
In accordance with the Uniform System of Accounts prescribed by FERC, AES Ohio capitalizes an allowance for the net cost of funds (interest on borrowed funds and a reasonable rate of return on equity funds) used for construction purposes during the period of construction with a corresponding credit to income. AFUDC equity and AFUDC debt were as follows for the years ended December 31, 2024, 2023 and 2022:
Years ended December 31,
$ in millions202420232022
AFUDC equity$6.2 $5.0 $5.7 
AFUDC debt$7.7 $6.5 $1.3 

Impairment of Long-lived Assets
GAAP requires that we test long-lived assets for impairment when indicators of impairment exist. If an asset is deemed to be impaired, we are required to write down the asset to its fair value with a charge to current earnings. The net book value of our property, plant, and equipment was $2,571.4 million and $2,221.0 million as of December 31, 2024 and 2023, respectively. We do not believe any of these assets are currently impaired. In making this assessment, we consider such factors as: the overall condition and distribution capacity of the assets; the expected ability to recover additional expenditures in the assets; and the anticipated demand and relative pricing of retail electricity in our service territory.

Intangible Assets
Intangibles include software and renewable energy credits. Renewable energy credits are carried on a weighted average cost basis and amortized as they are used or retired. Finite-lived intangible assets include capitalized software amortized on a straight-line basis over their estimated useful lives. These capitalized software intangible assets have a 12.6 year-weighted average amortization period.

The following table presents information related to the Company's capitalized software balances, including the gross amount capitalized and related amortization:
December 31,
$ in millions20242023
Capitalized software$197.7 $146.5 
Accumulated amortization$(22.6)$(32.5)
Years ended December 31,
202420232022
Amortization expense$9.8 $4.1 $3.3 
Estimated future amortization
Years ending December 31,
2025$15.7 
202615.5 
202715.2 
202814.9 
202914.5 
Total$75.8 
Implementation Costs Related to Software as a Service
DPL has recorded prepayments for implementation costs related to software as a service in support of utility customer services which are recorded within Prepayments and other current assets and Other non-current assets on the accompanying Consolidated Balance Sheets as follows:

December 31,
$ in millions20242023
Implementation costs$4.0 $14.8 

Debt Issuance Costs
Costs incurred in connection with the issuance of long-term debt are deferred and presented as a direct reduction from the face amount of that debt and amortized over the related financing period using the effective interest method. Debt issuance costs related to a line-of-credit or revolving credit facility are deferred and presented as an asset and amortized over the related financing period. Make-whole payments in connection with early debt retirements are classified as cash flows from financing activities.

Contingencies
DPL accrues for loss contingencies when the amount of the loss is probable and estimable. We are subject to various environmental regulations and are involved in certain legal proceedings. If DPL’s actual environmental and/or legal obligations are different from our estimates, the recognition of the actual amounts may have a material impact on our results of operations, financial condition and cash flows; although that has not been the case during the periods covered by this report. Accruals for loss contingencies were not material as of December 31, 2024 and 2023. See Note 10. Contractual Obligations, Commercial Commitments and Contingencies for additional information.

Financial Instruments
Our Master Trust investments in debt and equity financial instruments of publicly traded entities are classified as equity investments. These equity securities are carried at fair value and unrealized gains and losses on these securities are recorded in Other income. As these financial instruments are held to be used for the benefit of employees or former employees participating in employee benefit plans and are not used for general operating purposes, they are recorded within Other non-current assets on the accompanying Consolidated Balance Sheets. See Note 4. Fair Value for more information.

Financial Derivatives
We have contracts involving the physical delivery of energy. These contracts qualify for the normal purchases and normal sales scope exception in ASC 815 - Derivatives and Hedging, thus we have elected to account for them as accrual contracts, which are not adjusted for changes in fair value.

We have, in the past, used interest rate hedges to manage the interest rate risk of our variable rate debt. We used cash flow hedge accounting when the hedge or a portion of the hedge was deemed to be highly effective, which resulted in changes in fair value being recorded within accumulated other comprehensive loss, a component of shareholder’s equity / (deficit). We elected not to offset net derivative positions in the consolidated financial statements. Accordingly, we did not offset such derivative positions against the fair value of amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral under master netting agreements. See Note 5. Derivative Instruments and Hedging Activities for more information.

Leases
We have operating leases primarily for office space in which we are the lessee. Operating leases with an initial term of 12 months or less are not recorded on the balance sheet, but are expensed on a straight-line basis over the lease term. Our leases do not contain any material residual value guarantees, restrictive covenants or subleases.

Right-of-use assets represent our right to use an underlying asset for the lease term while lease liabilities represent our obligation to make lease payments arising from the lease. Right-of-use assets and lease liabilities are recognized on commencement of the lease based on the present value of lease payments over the lease term. Generally, the rate implicit in the lease is not readily determinable; as such, we use the incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. We determine discount rates based on the existing credit rates of our borrowings which are then adjusted for the appropriate lease term. The right-of-use asset also includes any lease payments made and excludes lease
incentives that are paid or payable to the lessee at commencement. The lease term includes periods covered by the option to extend if it is reasonably certain that the option will be exercised and periods covered by an option to terminate if it is reasonably certain that the option will not be exercised.

Accumulated other comprehensive loss
The changes in the components of Accumulated other comprehensive loss during the years ended December 31, 2024 and 2023 are as follows:
$ in millionsGains / (losses) on cash flow hedgesChange in unfunded pension and other postretirement obligationsTotal
Balance at January 1, 2023$12.0 $(14.4)$(2.4)
Other comprehensive loss before reclassifications— (1.6)(1.6)
Amounts reclassified from accumulated other comprehensive loss to earnings(0.8)0.2 (0.6)
Net current period other comprehensive loss(0.8)(1.4)(2.2)
Balance at December 31, 202311.2 (15.8)(4.6)
Other comprehensive loss before reclassifications— — — 
Amounts reclassified from accumulated other comprehensive loss to earnings(0.8)0.1 (0.7)
Net current period other comprehensive income / (loss)(0.8)0.1 (0.7)
Balance at December 31, 2024$10.4 $(15.7)$(5.3)

Insurance and Claims Costs
In addition to insurance obtained from third-party providers, MVIC, a wholly-owned captive subsidiary of DPL, provides insurance coverage solely to us and our subsidiaries for workers’ compensation, general liability and property damage on an ongoing basis. Estimates of the liabilities for insurance and claims costs associated with MVIC and the liabilities for medical, life, disability and other reserves for claims costs below certain coverage thresholds of third-party providers are as follows:
Balance SheetDecember 31,
$ in millionsClassification20242023
Estimated insurance and claims costsAccrued and other current liabilities$2.2 $1.8 
Estimated liabilities for medical, life, disability and other reserves
Accrued and other current liabilities and Other non-current liabilities
$7.3 $8.0 

The estimated liabilities for workers’ compensation, medical, life and disability costs at DPL are actuarially determined using certain assumptions. There is uncertainty associated with these loss estimates, and actual results may differ from the estimates. Modification of these loss estimates based on experience and changed circumstances is reflected in the period in which the estimate is re-evaluated.

Revenue Recognition
Revenue is recognized from retail and wholesale electricity sales and electricity transmission and distribution delivery services. Revenue is recognized upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods or services. Energy sales to customers are based on the reading of their meters that occurs on a systematic basis throughout the month. We recognize the revenue on our Consolidated Statements of Operations using an accrual method for retail and other energy sales that have not yet been billed, but where electricity has been consumed. This is termed “unbilled revenue” and is a widely recognized and accepted practice for utilities. At the end of each month, unbilled revenue is determined by the estimation of unbilled energy provided to customers since the date of the last meter reading, estimated line losses, the assignment of unbilled energy provided to customer classes and the average rate per customer class. For more information, see Note 13. Revenue.
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. AES Ohio’s excise taxes and certain other taxes are accounted for on a net basis and recorded as a reduction in revenue in the accompanying Consolidated Statements of Operations. The amounts of such taxes were as follows:
Years ended December 31,
$ in millions202420232022
Excise taxes collected$48.7 $46.6 $49.2 

Repair and Maintenance Costs
Costs associated with maintenance activities are recognized at the time the work is performed. These costs, which include labor, materials and supplies and outside services required to maintain equipment and facilities, are capitalized or expensed based on defined units of property.

Pension and Postretirement Benefits
We recognize in our Consolidated Balance Sheets an asset or liability reflecting the funded status of pension and other postretirement plans with current-year changes from actuarial gains or losses related to our regulated operations, which would otherwise be recognized in AOCL, recorded as a regulatory asset as this can be recovered through future rates. Such changes that are not related to our regulated operations are recognized in AOCL. All plan assets are recorded at fair value. We follow the measurement date provisions of the accounting guidance, which require a year-end measurement date of plan assets and obligations for all defined benefit plans.

We account for and disclose pension and postretirement benefits in accordance with the provisions of GAAP relating to the accounting for pension and other postretirement plans. These GAAP provisions require the use of assumptions, such as the discount rate for liabilities and long-term rate of return on assets, in determining the obligations, annual cost and funding requirements of the plans. Consistent with the requirements of ASC 715 - Compensation - Retirement Benefits, we apply a disaggregated discount rate approach for determining service cost and interest cost for our defined benefit pension plans and postretirement plans.

See Note 8. Benefit Plans for more information.

Income Taxes
Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of the existing assets and liabilities and their respective income tax bases. We establish an allowance when it is more likely than not that all or a portion of a deferred tax asset will not be realized. Our tax positions are evaluated under a more likely than not recognition threshold and measurement analysis before they are recognized for consolidated financial statement reporting. Uncertain tax positions have been classified as noncurrent income tax liabilities unless expected to be paid within one year. Our policy for interest and penalties is to recognize interest and penalties as a component of the provision for income taxes in the Consolidated Statements of Operations.

Income taxes payable, which are includable in allowable costs for ratemaking purposes in future years, are recorded as regulatory assets or liabilities with a corresponding deferred tax liability or asset. Investment tax credits that reduced federal income taxes in the years they arose have been deferred and are being amortized to income over the useful lives of the properties in accordance with regulatory treatment. See Note 2. Regulatory Matters for more information.

DPL and its subsidiaries file U.S. federal income tax returns as part of the consolidated U.S. income tax return filed by AES. The consolidated tax liability is allocated to each subsidiary based on the separate return method as specified in our tax allocation agreement, and which provides a consistent, systematic and rational approach. See Note 7. Income Taxes for more information.

Related Party Transactions
In the normal course of business, DPL enters into transactions with related parties. All material intercompany accounts and transactions are eliminated in DPL’s Consolidated Financial Statements. See Note 11. Related Party Transactions for more information.
New accounting pronouncements adopted in 2024
The following table provides a brief description of recent accounting pronouncements that had an impact on our consolidated financial statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or did not have a material impact on our consolidated financial statements.
ASU Number and NameDescriptionDate of AdoptionEffect on the financial statement upon adoption
2023-07 Segment Reporting (Topic 280): Improvements to Reportable Segment DisclosuresThe amendments in this section are designed to improve the disclosures related to Segment reporting on an interim and annual basis. Public companies must disclose significant segment expenses and an amount for other segment items. This will also require that a company disclose its annual disclosures under Topic 280 in each interim period. Furthermore, companies will need to disclose the Chief Operating Decision Maker (CODM) and how the CODM assesses the performance of a segment. Lastly, public companies that have a single reportable segment must report the required disclosures under topic 280.December 31, 2024
We adopted this standard on a retrospective basis. Please refer to Note 12, "Business Segments" for impact.
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 consolidated financial statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or did not have a material impact on our Consolidated Financial Statements.
ASU Number and NameDescriptionDate of AdoptionEffect on the financial statements upon adoption
2023-06 Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative
In U.S. Securities and Exchange Commission (SEC) Release No. 33-10532, Disclosure Update and Simplification, issued August 17, 2018, the SEC referred certain of its disclosure requirements that overlap with, but require incremental information to, generally accepted accounting principles (GAAP) to the FASB for potential incorporation into the Codification. The amendments in this Update are the result of the Board’s decision to incorporate into the Codification 14 of the 27 disclosures referred by the SEC.

The amendments in this Update represent changes to clarify or improve disclosure and presentation requirements of a variety of Topics. Many of the amendments allow users to more easily compare entities subject to the SEC’s existing disclosures with those entities that were not previously subject to the SEC’s requirements. Also, the amendments align the requirements in the Codification with the SEC’s regulations.
The effective date for each amendment will be the date on which the SEC's removal of that related disclosure becomes effective, with early adoption prohibited. The amendments in this Update should be applied prospectivelyWe will provide the required disclosures on a prospective basis on the date each amendment becomes effective. We do not expect ASU 2023-06 will have any impact on our Consolidated Financial Statements.
2023-09 Income Taxes (Topic 740): Improvements to Income Tax DisclosuresThe amendments in this Update require that public business entities on an annual basis (1) disclose specific categories in the rate reconciliation and (2) provide additional information for reconciling items that meet a quantitative threshold. Furthermore, companies are required to disclose a disaggregated amount of income taxes paid at a federal, state, and foreign level as well as a break down of income taxes paid in a jurisdiction that comprises 5% of a company's total income taxes paid. Lastly, this ASU requires that companies disclose income (loss) from continuing operations before income tax at a domestic and foreign level and that companies disclose income tax expense from continuing operations on a federal, state, and foreign level.The amendments in this Update are effective for fiscal years beginning after December 15, 2024We are currently evaluating the impact of adopting the standard on our Consolidated Financial Statements.
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 permittedWe are currently evaluating the impact of adopting the standard on our Consolidated Financial Statements.