Form 8-K

8-K — DTE ENERGY CO

Accession: 0000936340-26-000083

Filed: 2026-05-01

Period: 2026-05-01

CIK: 0000936340

SIC: 4911 (ELECTRIC SERVICES)

Item: Results of Operations and Financial Condition

Item: Financial Statements and Exhibits

Documents

8-K — dte-20260501.htm (Primary)

EX-99.1 (dtegas-exhibit991x033126.htm)

GRAPHIC (dte-20260501_g1.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: dte-20260501.htm · Sequence: 1

dte-20260501

0000936340false00009363402026-05-012026-05-010000936340us-gaap:CommonStockMember2026-05-012026-05-010000936340dte:SeriesE20175.25JuniorSubordinatedDebenturesDue2077Member2026-05-012026-05-010000936340dte:SeriesG20204375JuniorSubordinatedDebenturesDue2080Member2026-05-012026-05-010000936340dte:SeriesE20214375JuniorSubordinatedDebenturesDue2081Member2026-05-012026-05-010000936340dte:SeriesH20256.25JuniorSubordinatedDebenturesDue2085Member2026-05-012026-05-01

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________

FORM 8-K

_____________________________

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 01, 2026

Commission File Number: 1-11607

DTE Energy Company

Michigan 38-3217752

(State or other jurisdiction of incorporation or organization) (I.R.S Employer Identification No.)

Registrants address of principal executive offices: One Energy Plaza, Detroit, Michigan 48226-1221

Registrants telephone number, including area code: (313) 235-4000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class

Trading Symbol(s)

Name of Exchange on which Registered

Common stock, without par value

DTE

New York Stock Exchange

2017 Series E 5.25% Junior Subordinated Debentures due 2077

DTW

New York Stock Exchange

2020 Series G 4.375% Junior Subordinated Debentures due 2080 DTB

New York Stock Exchange

2021 Series E 4.375% Junior Subordinated Debentures due 2081 DTG New York Stock Exchange

2025 Series H 6.25% Junior Subordinated Debentures due 2085 DTK New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 under the Securities Act (17 CFR 230.405) or Rule 12b-2 under Exchange Act (17 CFR 240.12b-2).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02. Results of Operations and Financial Condition.

DTE Energy Company (“DTE Energy”) is furnishing the Securities and Exchange Commission (“SEC”) the financial statements for its indirect wholly-owned subsidiary, DTE Gas Company, for the quarter ended March 31, 2026. The financial statements were posted to DTE Energy's website at www.dteenergy.com on May 1, 2026. The financial statements are furnished as Exhibit 99.1 and incorporated herein by reference.

In accordance with General Instruction B.2 of Form 8-K, the information contained in this Current Report on Form 8-K under Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth in such a filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

99.1

Financial Statements of DTE Gas Company for the quarter ended March 31, 2026.

104 Cover Page Interactive Data File (embedded within the Inline XBRL document).

Forward-Looking Statements:

This Form 8-K contains forward-looking statements that are subject to various assumptions, risks and uncertainties. It should be read in conjunction with the “Forward-Looking Statements” section in DTE Energy's 2025 Form 10-K and 2026 Form 10-Qs (which sections are incorporated by reference herein), and in conjunction with other SEC reports filed by DTE Energy that discuss important factors that could cause DTE Energy's actual results to differ materially. DTE Energy expressly disclaims any current intention to update any forward-looking statements contained in this report as a result of new information or future events or developments.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned hereunto duly authorized.

Date: May 1, 2026

DTE Energy Company

(Registrant)

/s/Tracy J. Myrick

Tracy J. Myrick

Chief Accounting Officer

EX-99.1

Filename: dtegas-exhibit991x033126.htm · Sequence: 2

Document

Exhibit 99.1

DTE Gas Company

Unaudited Consolidated Financial Statements as of and for the Three Months Ended March 31, 2026

TABLE OF CONTENTS

Page

Definitions

Consolidated Statements of Operations (Unaudited)

Consolidated Statements of Comprehensive Income (Unaudited)

Consolidated Statements of Financial Position (Unaudited)

Consolidated Statements of Cash Flows (Unaudited)

Consolidated Statements of Changes in Shareholder's Equity (Unaudited)

Notes to Consolidated Financial Statements (Unaudited)

Note 1 — Organization and Basis of Presentation

Note 2 — Significant Accounting Policies

Note 3 — New Accounting Pronouncements

Note 4 — Revenue

Note 5 — Regulatory Matters

Note 6 — Fair Value

Note 7 — Financial and Other Derivative Instruments

Note 8 — Short-Term Credit Arrangements and Borrowings

Note 9 — Commitments and Contingencies

Note 10 — Retirement Benefits and Trusteed Assets

Table of Contents

DEFINITIONS

ASU Accounting Standards Update issued by the FASB

Company DTE Gas Company and subsidiary companies

Customer Choice Michigan legislation giving customers the option of retail access to alternative suppliers for natural gas

DTE Energy DTE Energy Company, directly or indirectly the parent of DTE Electric Company, DTE Gas, and numerous non-utility subsidiaries

DTE Gas DTE Gas Company (an indirect wholly-owned subsidiary of DTE Energy) and subsidiary companies

EGLE Michigan Department of Environment, Great Lakes, and Energy, formerly known as Michigan Department of Environmental Quality

EPA U.S. Environmental Protection Agency

FASB Financial Accounting Standards Board

FERC Federal Energy Regulatory Commission

GCR A Gas Cost Recovery mechanism authorized by the MPSC that allows DTE Gas to recover through rates its natural gas costs

MGP Manufactured Gas Plant

MPSC Michigan Public Service Commission

TCJA Tax Cuts and Jobs Act of 2017, which reduced the corporate Federal income tax rate from 35% to 21%

Topic 606 FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, as amended

VIE Variable Interest Entity

Table of Contents

DTE Gas Company

Consolidated Statements of Operations (Unaudited)

Three Months Ended

March 31,

2026 2025

(In millions)

Operating Revenues $ 923 $ 868

Operating Expenses

Cost of gas

373 326

Operation and maintenance

149 154

Depreciation and amortization

58 54

Taxes other than income

38 37

618 571

Operating Income 305 297

Other (Income) and Deductions

Interest expense

35 32

Interest income

(1) (2)

Non-operating retirement benefits, net

(1) (1)

Other income

(2) (1)

Other expenses

2 1

33 29

Income Before Income Taxes 272 268

Income Tax Expense 63 63

Net Income $ 209 $ 205

See Notes to Consolidated Financial Statements (Unaudited)

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DTE Gas Company

Consolidated Statements of Comprehensive Income (Unaudited)

Three Months Ended

March 31,

2026 2025

(In millions)

Net Income $ 209 $ 205

Other comprehensive income — —

Comprehensive Income $ 209 $ 205

See Notes to Consolidated Financial Statements (Unaudited)

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DTE Gas Company

Consolidated Statements of Financial Position (Unaudited)

March 31, December 31,

2026 2025

(In millions)

ASSETS

Current Assets

Cash and cash equivalents

$ 135 $ 31

Accounts receivable (less allowance for doubtful accounts of $25 and $17, respectively)

Customer

437 422

Affiliates

26 10

Other

4 2

Inventories

Gas

11 45

Materials and supplies

39 38

Gas customer choice deferred asset

16 39

Notes receivable

Other

3 3

Regulatory assets

52 12

Other

45 31

768 633

Investments

53 54

Property

Property, plant, and equipment

9,321 9,212

Accumulated depreciation and amortization (2,098) (2,072)

7,223 7,140

Other Assets

Regulatory assets

547 559

Notes receivable 49 49

Prepaid pension costs — affiliates

134 130

Prepaid postretirement costs — affiliates

309 298

Other

50 42

1,089 1,078

Total Assets $ 9,133 $ 8,905

See Notes to Consolidated Financial Statements (Unaudited)

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DTE Gas Company

Consolidated Statements of Financial Position (Unaudited) — Continued

March 31, December 31,

2026 2025

(In millions, except shares)

LIABILITIES AND SHAREHOLDER'S EQUITY

Current Liabilities

Accounts payable

Affiliates

$ 77 $ 30

Other

174 208

Accrued interest 46 31

Short-term borrowings

Affiliates 1 1

Other

— 80

Gas inventory equalization

125 —

Regulatory liabilities

2 40

Other

45 59

470 449

Long-Term Debt 3,043 3,043

Other Liabilities

Deferred income taxes

1,072 1,031

Regulatory liabilities

1,016 1,006

Asset retirement obligations

211 208

Accrued pension liability — affiliates

11 11

Accrued postretirement liability — affiliates

2 2

Other

39 39

2,351 2,297

Commitments and Contingencies (Notes 5 and 9)

Shareholder's Equity

Common stock ($1 par value, 15,100,000 shares authorized, and 10,300,000 shares issued and outstanding for both periods) 1,803 1,803

Retained earnings

1,466 1,313

Total Shareholder's Equity 3,269 3,116

Total Liabilities and Shareholder's Equity $ 9,133 $ 8,905

See Notes to Consolidated Financial Statements (Unaudited)

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DTE Gas Company

Consolidated Statements of Cash Flows (Unaudited)

Three Months Ended

March 31,

2026 2025

(In millions)

Operating Activities

Net Income $ 209 $ 205

Adjustments to reconcile Net Income to Net cash from operating activities:

Depreciation and amortization 58 54

Allowance for equity funds used during construction (1) —

Deferred income taxes 36 49

Changes in assets and liabilities:

Accounts receivable, net (33) (78)

Inventories 33 49

Prepaid pension costs — affiliates (4) (4)

Prepaid postretirement benefit costs — affiliates (11) (11)

Accounts payable 34 (2)

Gas inventory equalization 125 121

Accrued pension liability — affiliates — (1)

Regulatory assets and liabilities (50) (10)

Other current and noncurrent assets and liabilities 11 33

Net cash from operating activities 407 405

Investing Activities

Plant and equipment expenditures (166) (125)

Notes receivable from affiliates — (202)

Other (1) —

Net cash used for investing activities (167) (327)

Financing Activities

Short-term borrowings, net — affiliates — (14)

Short-term borrowings, net — other (80) (9)

Dividends paid on common stock (56) (55)

Net cash used for financing activities (136) (78)

Net Increase in Cash and Cash Equivalents 104 —

Cash and Cash Equivalents at Beginning of Period 31 —

Cash and Cash Equivalents at End of Period $ 135 $ —

Supplemental disclosure of non-cash investing and financing activities

Plant and equipment expenditures in accounts payable $ 57 $ 47

See Notes to Consolidated Financial Statements (Unaudited)

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DTE Gas Company

Consolidated Statements of Changes in Shareholder's Equity (Unaudited)

Common Stock Additional Paid-in Capital Retained Earnings

Shares Amount Total

(Dollars in millions, shares in thousands)

Balance, December 31, 2025 10,300 $ 10 $ 1,793 $ 1,313 $ 3,116

Net Income — — — 209 209

Dividends declared on common stock — — — (56) (56)

Balance, March 31, 2026 10,300 $ 10 $ 1,793 $ 1,466 $ 3,269

Common Stock Additional Paid-in Capital Retained Earnings

Shares Amount Total

(Dollars in millions, shares in thousands)

Balance, December 31, 2024 10,300 $ 10 $ 1,743 $ 1,238 $ 2,991

Net Income — — — 205 205

Dividends declared on common stock — — — (55) (55)

Balance, March 31, 2025 10,300 $ 10 $ 1,743 $ 1,388 $ 3,141

See Notes to Consolidated Financial Statements (Unaudited)

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DTE Gas Company

Notes to Consolidated Financial Statements (Unaudited)

NOTE 1 — ORGANIZATION AND BASIS OF PRESENTATION

Corporate Structure

DTE Gas is a public utility engaged in the purchase, storage, transportation, distribution, and sale of natural gas to approximately 1.4 million customers throughout Michigan and the sale of storage and transportation capacity. The Company is regulated by the MPSC and certain activities are regulated by the FERC. In addition, the Company is regulated by other federal and state regulatory agencies including the EPA and EGLE.

Basis of Presentation

The Consolidated Financial Statements should be read in conjunction with the Notes to Consolidated Financial Statements included in the Company's 2025 Consolidated Financial Statements furnished on Form 8-K.

The accompanying Consolidated Financial Statements are prepared using accounting principles generally accepted in the United States of America. These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from the Company's estimates.

The Consolidated Financial Statements are unaudited but, in the Company's opinion include all adjustments necessary to present a fair statement of the results for the interim periods. All adjustments are of a normal recurring nature, except as otherwise disclosed in these Consolidated Financial Statements and Notes to Consolidated Financial Statements. Financial results for this interim period are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2026.

Principles of Consolidation

The Company consolidates all majority-owned subsidiaries and investments in entities in which it has controlling influence. Non-majority owned investments are accounted for using the equity method when the Company is able to significantly influence the operating policies of the investee. When the Company does not influence the operating policies of an investee, the equity investment is valued at cost minus any impairments, if applicable. The Company eliminates all intercompany balances and transactions.

The Company evaluates whether an entity is a VIE whenever reconsideration events occur. The Company consolidates VIEs for which it is the primary beneficiary. If the Company is not the primary beneficiary and an ownership interest is held, the VIE is accounted for under the equity method of accounting. When assessing the determination of the primary beneficiary, the Company considers all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. The Company performs ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed.

The Company holds a variable interest in a natural gas pipeline entity through purchases under a long-term transportation capacity contract. The Company does not have a controlling influence in and does not consolidate the pipeline entity. As of March 31, 2026, the carrying amount of liabilities in the Company's Consolidated Statements of Financial Position that relate to its variable interest under the long-term contract are primarily related to working capital accounts and generally represent the amounts owed by the Company for transportation associated with the current billing cycle under the contract. The Company has not provided any significant form of financial support associated with the long-term contract. There is no material potential exposure to loss as a result of the Company's variable interest through the long-term contract.

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DTE Gas Company

Notes to Consolidated Financial Statements (Unaudited) - (Continued)

NOTE 2 — SIGNIFICANT ACCOUNTING POLICIES

Income Taxes

Tax rates are affected by estimated annual permanent items, regulatory adjustments, and discrete items that may occur in any given period, but are not consistent from period to period. The table below summarizes how the Company's effective income tax rates have varied from the statutory federal income tax rate:

Three Months Ended March 31,

2026 2025

Statutory federal income tax rate 21.0 % 21.0 %

Increase (decrease) due to:

State and local income taxes, net of federal benefit 5.4 5.4

TCJA regulatory liability amortization (2.9) (2.9)

Other (0.4) (0.1)

Effective income tax rate 23.1 % 23.4 %

The Company had federal and state income tax payables with DTE Energy of $19 million at March 31, 2026 which are included in Accounts payable — Affiliates on the Consolidated Statements of Financial Position. The Company had federal and state income tax receivables with DTE Energy of $8 million at December 31, 2025, which are included in Accounts receivable — Affiliates on the Consolidated Statements of Financial Position.

Allocated Stock-Based Compensation

The Company received an allocation of costs from DTE Energy associated with stock-based compensation of $4 million and $3 million for the three months ended March 31, 2026 and 2025, respectively.

Financing Receivables

Financing receivables are primarily composed of trade receivables, notes receivable, and unbilled revenue. The Company's financing receivables are stated at net realizable value.

The Company monitors the credit quality of financing receivables on a regular basis by reviewing credit quality indicators and monitoring for trigger events, such as a credit rating downgrade or bankruptcy. Credit quality indicators include, but are not limited to, ratings by credit agencies where available, collection history, collateral, counterparty financial statements and other internal metrics. Utilizing such data, the Company has determined three internal grades of credit quality. Internal grade 1 includes financing receivables for counterparties where credit rating agencies have ranked the counterparty as investment grade. To the extent credit ratings are not available, the Company utilizes other credit quality indicators to determine the level of risk associated with the financing receivable. Internal grade 1 may include financing receivables for counterparties for which credit rating agencies have ranked the counterparty as below investment grade; however, due to favorable information on other credit quality indicators, the Company has determined the risk level to be similar to that of an investment grade counterparty. Internal grade 2 includes financing receivables for counterparties with limited credit information and those with a higher risk profile based upon credit quality indicators. Internal grade 3 reflects financing receivables for which the counterparties have the greatest level of risk, including those in bankruptcy status.

The following represents the Company's financing receivables by year of origination, classified by internal grade of credit risk, including current year-to-date gross write-offs, if any. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through March 31, 2026.

Year of Origination

2026 2025 2024 and Prior Total

(In millions)

Notes receivable, internal grade 2 $ 1 $ 4 $ 13 $ 18

Net investment in leases, internal grade 1 $ — $ — $ 34 $ 34

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DTE Gas Company

Notes to Consolidated Financial Statements (Unaudited) - (Continued)

The allowance for doubtful accounts on accounts receivable for the Company is generally calculated using an aging approach that utilizes rates developed in reserve studies. The Company establishes an allowance for uncollectible accounts based on historical losses and management's assessment of existing and future economic conditions, customer trends and other factors. Customer accounts are generally considered delinquent if the amount billed is not received by the due date, which is typically in 21 days, however, factors such as assistance programs may delay aggressive action. The Company generally assesses late payment fees on trade receivables based on past-due terms with customers. Customer accounts are written off when collection efforts have been exhausted. The time period for write-off is 150 days after service has been terminated.

The allowance for doubtful accounts for other receivables is generally calculated based on specific review of probable future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, customer trends and other factors are also considered. Receivables are written off on a specific identification basis and determined based upon the specific circumstances of the associated receivable.

Notes receivable are primarily comprised of a finance lease receivable and loans that are included in Notes Receivable on the Consolidated Statements of Financial Position.

The Company establishes an allowance for credit loss for principal and interest amounts due that are estimated to be uncollectible in accordance with the contractual terms of the note receivable. In determining the allowance for credit losses for notes receivable, the Company considers the historical payment experience and other factors that are expected to have a specific impact on the counterparty's ability to pay including existing and future economic conditions. Notes receivable are typically considered delinquent when payment is not received for periods ranging from 60 to 120 days. If amounts are no longer probable of collection, the Company may consider the note receivable impaired, adjust the allowance, and cease accruing interest (nonaccrual status).

Cash payments received on nonaccrual status notes receivable, that do not bring the account contractually current, are first applied to the contractually owed past due interest, with any remainder applied to principal. Accrual of interest is generally resumed when the note receivable becomes contractually current.

The following tables present a roll-forward of the activity for the Company's financing receivables credit loss reserves:

Trade accounts receivable Other receivables Total

(In millions)

Beginning reserve balance, January 1, 2026 $ 16 $ 1 $ 17

Current period provision 14 — 14

Write-offs charged against allowance (9) — (9)

Recoveries of amounts previously written off 3 — 3

Ending reserve balance, March 31, 2026 $ 24 $ 1 $ 25

Trade accounts receivable Other receivables Total

(In millions)

Beginning reserve balance, January 1, 2025 $ 21 $ 1 $ 22

Current period provision 25 — 25

Write-offs charged against allowance (42) — (42)

Recoveries of amounts previously written off 12 — 12

Ending reserve balance, December 31, 2025 $ 16 $ 1 $ 17

Uncollectible expense is primarily comprised of the current period provision for allowance for doubtful accounts. Uncollectible expense was $14 million and $16 million for the three months ended March 31, 2026 and 2025, respectively.

There are no material amounts of past due financing receivables for the Company as of March 31, 2026.

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DTE Gas Company

Notes to Consolidated Financial Statements (Unaudited) - (Continued)

NOTE 3 — NEW ACCOUNTING PRONOUNCEMENTS

Recently Adopted Pronouncements

In July 2025, the FASB issued ASU No. 2025-05, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets, which provides a practical expedient related to the estimation of expected credit losses for current accounts receivable and current contract assets arising from transactions accounted for under ASC 606. The Company adopted the ASU effective January 1, 2026 on a prospective basis and elected not to apply the practical expedient, with no impact on the Company's financial position or results of operations.

Recently Issued Pronouncements

In November 2024, the FASB issued ASU No. 2024-03, Income Statement-Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, as amended. The amendments in this update require disaggregated disclosure of income statement expense captions into specified categories in disclosures with the footnotes to the financial statements. The ASU is effective for the Company for annual reporting periods beginning after December 15, 2026, and for interim reporting periods beginning after December 15, 2027. The guidance may be applied on a prospective or retrospective basis. Early adoption is permitted. The Company will apply the guidance upon the effective date.

In September 2025, the FASB issued ASU No. 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 modernize the accounting guidance for the costs to develop software for internal use. The amendments remove all references to a sequential software development method (referred to as "project stages") throughout ASC 350-40 and clarifies the threshold entities apply to begin capitalizing eligible costs. The ASU is effective for the Company for annual and interim periods beginning after December 15, 2027. The guidance may be applied on a prospective, retrospective, or modified transition basis. Early adoption is permitted. The Company is currently assessing the impact of this standard on its Consolidated Financial Statements.

NOTE 4 — REVENUE

Disaggregation of Revenue

The following is a summary of disaggregated revenues for the Company:

Three Months Ended March 31,

2026 2025

(In millions)

Gas sales $ 684 $ 683

End User Transportation 91 91

Intermediate Transportation 39 31

Other(a)

109 63

Total Gas operating revenues $ 923 $ 868

_______________________________________

(a)Includes revenue adjustments related to various regulatory mechanisms, including the GCR, which may vary based on changes in the cost of gas.

Revenues included the following which were outside the scope of Topic 606:

Three Months Ended March 31,

2026 2025

(In millions)

Other revenues $ 4 $ 3

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DTE Gas Company

Notes to Consolidated Financial Statements (Unaudited) - (Continued)

Transaction Price Allocated to the Remaining Performance Obligations

In accordance with optional exemptions available under Topic 606, the Company did not disclose the value of unsatisfied performance obligations for (1) contracts with an original expected length of one year or less, (2) with the exception of fixed consideration, contracts for which revenue is recognized at the amount to which the Company has the right to invoice for goods provided and services performed, and (3) contracts for which variable consideration relates entirely to an unsatisfied performance obligation.

Such contracts consist of varying types of performance obligations, including the supply and delivery of energy related products and services. Contracts with variable volumes and/or variable pricing have also been excluded as the related consideration under the contract is variable at inception of the contract. Contract lengths vary from cancellable to multi-year.

The Company expects to recognize revenue for the following amounts related to fixed consideration associated with remaining performance obligations in each of the future periods noted:

(In millions)

2026 $ 95

2027 120

2028 107

2029 90

2030 76

2031 and thereafter 168

$ 656

NOTE 5 — REGULATORY MATTERS

2025 Gas Rate Case Filing

DTE Gas filed a rate case with the MPSC on November 13, 2025 requesting a net increase in base rates of $163 million based on a projected twelve-month period ending September 30, 2027, and an increase in return on equity from 9.8% to 10.25%. The net increase is based on a total revenue deficiency of $238 million, net of the IRM roll-in of $75 million. The requested net increase in base rates was primarily due to continued infrastructure investment and increasing operations and maintenance costs needed to ensure the continued safe and reliable delivery of natural gas to customers. A final MPSC order in this case is expected in September 2026.

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DTE Gas Company

Notes to Consolidated Financial Statements (Unaudited) - (Continued)

NOTE 6 — FAIR VALUE

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable inputs. The Company makes certain assumptions it believes that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. Credit risk of the Company and its counterparties is incorporated in the valuation of assets and liabilities through the use of credit reserves, the impact of which was immaterial at March 31, 2026 and December 31, 2025. The Company believes it uses valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs.

A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. The Company classifies fair value balances based on the fair value hierarchy defined as follows:

•Level 1 — Consists of unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access as of the reporting date.

•Level 2 — Consists of inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.

•Level 3 — Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints.

As of March 31, 2026, the Company had $143 million recorded at fair value on a recurring basis and classified as Level 1 assets. These assets included $130 million of cash equivalents and $13 million of equity securities recorded in Cash and cash equivalents and Investments, respectively, on the Consolidated Statements of Financial Position. At December 31, 2025, the Company had $44 million recorded at fair value on a recurring basis and classified as Level 1 assets. The assets included $31 million of cash equivalents and $13 million of equity securities recorded in Cash and cash equivalents and Investments, respectively, on the Consolidated Statements of Financial Position. For both periods, the assets exclude the cash surrender value of life insurance investments.

The following table presents the carrying amount and fair value of financial instruments:

March 31, 2026 December 31, 2025

Carrying Fair Value Carrying Fair Value

Amount Level 1 Level 2 Level 3 Amount Level 1 Level 2 Level 3

(In millions)

Notes receivable — Other, excluding lessor finance leases $ 18 $ — $ — $ 18 $ 18 $ — $ — $ 18

Short-term borrowings — Affiliates $ 1 $ — $ — $ 1 $ 1 $ — $ — $ 1

Short-term borrowings — Other $ — $ — $ — $ — $ 80 $ — $ 80 $ —

Long-term debt(a)

$ 3,043 $ — $ 1,680 $ 1,094 $ 3,043 $ — $ 1,551 $ 1,221

_______________________________________

(a)Carrying value also includes unamortized debt discounts and issuance costs.

For further fair value information on financial and derivative instruments, see Note 7 to the Consolidated Financial Statements, "Financial and Other Derivative Instruments."

Table of Contents

DTE Gas Company

Notes to Consolidated Financial Statements (Unaudited) - (Continued)

NOTE 7 — FINANCIAL AND OTHER DERIVATIVE INSTRUMENTS

The Company recognizes all derivatives at their fair value as Derivative assets or liabilities on the Consolidated Statements of Financial Position unless they qualify for certain scope exceptions, including the normal purchases and normal sales exception. Further, derivatives that qualify and are designated for hedge accounting are classified as either hedges of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (cash flow hedge); or as hedges of the fair value of a recognized asset or liability or of an unrecognized firm commitment (fair value hedge). For cash flow hedges, the derivative gain or loss is deferred in Accumulated other comprehensive income (loss) and later reclassified into earnings when the underlying transaction occurs. For fair value hedges, changes in fair values for the derivative and hedged item are recognized in earnings each period. For derivatives that do not qualify or are not designated for hedge accounting, changes in fair value are recognized in earnings each period.

The Company's primary market risk exposure is associated with commodity prices, credit, and interest rates. The Company has risk management policies to monitor and manage market risks. The Company purchases, stores, transports, distributes, and sells natural gas, and buys and sells transportation and storage capacity. The Company has fixed-priced contracts for portions of its expected natural gas supply requirements through March 2029. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Forward transportation and storage contracts are generally not derivatives and are therefore accounted for under the accrual method.

NOTE 8 — SHORT-TERM CREDIT ARRANGEMENTS AND BORROWINGS

The Company has a $300 million unsecured revolving credit agreement that can be used for general corporate borrowings but is intended to provide liquidity support for the Company's commercial paper program. Borrowings under the revolver are available at prevailing short-term interest rates. The facility will expire in October 2030. As of March 31, 2026, the Company did not have any commercial paper or revolver borrowings outstanding.

The unsecured revolving credit agreement requires the Company to maintain a total funded debt to capitalization ratio of no more than 0.65 to 1. In the agreement, "total funded debt" means all indebtedness of the Company and its consolidated subsidiaries, including finance lease obligations, hedge agreements, and guarantees of third parties' debt, but excluding contingent obligations, nonrecourse and junior subordinated debt, and, except for calculations at the end of the second quarter, certain short-term debt. "Capitalization" means the sum of (a) total funded debt plus (b) "consolidated net worth," which is equal to consolidated total equity of the Company and its consolidated subsidiaries (excluding pension effects under certain FASB statements), as determined in accordance with accounting principles generally accepted in the United States of America. At March 31, 2026, the total funded debt to total capitalization ratio for the Company was 0.48 to 1 and was in compliance with this financial covenant.

NOTE 9 — COMMITMENTS AND CONTINGENCIES

Environmental

Contaminated and Other Sites — Prior to the construction of major interstate natural gas pipelines, gas for heating and other uses was manufactured locally from processes involving coal, coke, or oil. The facilities, which produced gas, have been designated as MGP sites. The Company owns or previously owned 14 former MGP sites. Investigations have revealed contamination related to the by-products of gas manufacturing at each site. Cleanup of eight MGP sites is complete, and those sites are closed. The Company has also completed partial closure of five additional sites. Cleanup activities associated with the remaining sites will continue over the next several years. The MPSC has established a cost deferral and rate recovery mechanism for investigation and remediation costs incurred at former MGP sites. In addition to the MGP sites, the Company is also in the process of cleaning up other contaminated sites, including gate stations, gas pipeline releases, and underground storage tank locations. At both March 31, 2026 and December 31, 2025, the Company had $25 million accrued for remediation. These costs are not discounted to their present value. Any change in assumptions, such as remediation techniques, nature and extent of contamination, and regulatory requirements, could impact the estimate of remedial action costs for the sites and affect the Company's financial position and cash flows. The Company anticipates the cost amortization methodology approved by the MPSC, which allows for amortization of the MGP costs over a ten-year period beginning with the year subsequent to the year the MGP costs were incurred, will prevent the associated investigation and remediation costs from having a material adverse impact on the Company's results of operations.

Table of Contents

DTE Gas Company

Notes to Consolidated Financial Statements (Unaudited) - (Continued)

Air — In March 2023, the EPA published the Good Neighbor Rule, which includes provisions for compressor engines operated for the transportation of natural gas. In June 2024, the United States Supreme Court issued an opinion granting emergency applications to stay the Good Neighbor Rule. The stay will remain in effect during other litigation. The status of the rule remains uncertain as litigation is ongoing. At this time, the Company does not expect a significant financial impact.

In March 2024, the EPA finalized the National Ambient Air Quality Standards for fine particulate matter, particles of pollution with diameters generally 2.5 micrometers and smaller (PM2.5). It is likely that areas of Michigan in which the Company operates will be designated as non-attainment in the future and the state will be required to develop a State Implementation Plan for such areas. However, the EPA has announced its intention to review the standard. No impact is expected in the near term, and any long-term financial impacts cannot be assessed at this time.

Guarantees

In certain limited circumstances, the Company enters into contractual guarantees. The Company may guarantee another entity’s obligation in the event it fails to perform and may provide guarantees in certain indemnification agreements. The Company may also provide indirect guarantees for the indebtedness of others.

Labor Contracts

There are several bargaining units for the Company's approximate 1,150 represented employees, which represents 67% of the Company's total employees. None of the represented employees have contracts expiring within one year.

Purchase Commitments

The Company has made certain commitments in connection with 2026 annual capital expenditures that are expected to be approximately $900 million.

Other Contingencies

The Company is involved in certain other legal, regulatory, administrative, and environmental proceedings before various courts, arbitration panels, and governmental agencies concerning claims arising in the ordinary course of business. These proceedings include certain contract disputes, additional environmental reviews and investigations, audits, inquiries from various regulators, and pending judicial matters. The Company cannot predict the final disposition of such proceedings. The Company regularly reviews legal matters and records provisions for claims that it can estimate and are considered probable of loss. The resolution of these pending proceedings is not expected to have a material effect on the Consolidated Financial Statements in the periods they are resolved.

For a discussion of contingencies related to regulatory matters, see Note 5 to the Consolidated Financial Statements, "Regulatory Matters."

NOTE 10 — RETIREMENT BENEFITS AND TRUSTEED ASSETS

The Company participates in various plans that provide defined benefit pension and other postretirement benefits for DTE Energy and its affiliates. The plans are primarily sponsored by DTE Energy's subsidiary, DTE Energy Corporate Services, LLC, and cover substantially all employees of the Company. Plan participants of all plans are solely DTE Energy and affiliate participants.

The Company accounts for its participation in the represented qualified pension plan by applying single-employer accounting. Non-represented participation in qualified pension plans, and non-represented and represented participation in non-qualified pension plans, are accounted for by applying multiemployer accounting. Participation in other postretirement benefit plans is accounted for by applying multiple-employer accounting. Within multiemployer and multiple-employer plans, participants pool plan assets for investment purposes and to reduce the cost of plan administration. The primary difference between plan types is that assets contributed in multiemployer plans can be used to provide benefits for all participating employers, while assets contributed within a multiple-employer plan are restricted for use by the contributing employer.

Table of Contents

DTE Gas Company

Notes to Consolidated Financial Statements (Unaudited) - (Continued)

The following table details the components of net periodic benefit costs (credits) for represented pension benefits and total other postretirement benefits:

Pension Benefits Other Postretirement Benefits

2026 2025 2026 2025

(In millions)

Three Months Ended March 31,

Service cost $ 2 $ 2 $ 1 $ 1

Interest cost 6 6 4 4

Expected return on plan assets (8) (8) (11) (10)

Amortization of:

Net actuarial loss 2 2 1 1

Net periodic benefit cost (credit) $ 2 $ 2 $ (5) $ (4)

DTE Energy's subsidiaries accounted for under multiemployer guidance are responsible for their share of qualified and non-qualified pension benefit costs. The Company's allocated portion of pension benefit costs for non-represented plans included in regulatory assets and liabilities, operation and maintenance expense, and capital expenditures was $1 million and nominal for the three months ended March 31, 2026 and 2025, respectively. These amounts may include recognized contractual termination benefit charges, curtailment gains, and settlement charges.

Pension and Other Postretirement Contributions

The Company is not expecting to make any contributions to the represented or non-represented qualified pension plans or postretirement benefit plans in 2026. Plans may be updated at the discretion of management and depending on economic and financial market conditions. The Company anticipates transferring up to $25 million from its non-represented qualified pension plan to DTE Electric Company during 2026 in exchange for cash consideration. In 2025, the Company transferred $25 million of qualified pension plan funds to DTE Electric Company in exchange for cash consideration.

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