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The financial statements for DTE Gas Company, an indirect wholly-owned subsidiary of DTE Energy Company, for the quarter and six months ended June 30, 2026, were furnished as Exhibit 99.1 and posted to DTE Energy’s website on July 31, 2026.

Operating Revenues

For the three months ended June 30, 2026, operating revenues for DTE Gas Company were $311 million, a slight decrease from $313 million in 2025. For the six months ended June 30, operating revenues increased to $1,234 million in 2026 from $1,181 million in 2025.

Disaggregated Revenue

• Gas sales: $222 million for the three months ended June 30, 2026, down from $225 million in 2025. For the six months ended June 30, 2026, gas sales were $906 million, down from $908 million in 2025.
• End User Transportation: $53 million for the three months ended June 30, 2026, up from $51 million in 2025. For the six months ended June 30, 2026, end user transportation revenue was $144 million, up from $142 million in 2025.
• Intermediate Transportation: $16 million for the three months ended June 30, 2026, unchanged from $16 million in 2025. For the six months ended June 30, 2026, intermediate transportation revenue was $55 million, up from $47 million in 2025.
• Other revenues: $20 million for the three months ended June 30, 2026, down from $21 million in 2025. For the six months ended June 30, 2026, other revenues were $129 million, up from $84 million in 2025, and include revenue adjustments related to various regulatory mechanisms, such as the GCR.

Operating Expenses

Total operating expenses for the three months ended June 30, 2026, were $288 million, up from $278 million in 2025. For the six months ended June 30, total operating expenses were $906 million in 2026, up from $849 million in 2025.

Breakdown of Operating Expenses

• Cost of gas: $36 million for the three months ended June 30, 2026, down from $43 million in 2025. For the six months ended June 30, 2026, cost of gas was $409 million, up from $369 million in 2025.
• Operation and maintenance: $158 million for the three months ended June 30, 2026, up from $148 million in 2025. For the six months ended June 30, 2026, operation and maintenance expenses were $307 million, up from $302 million in 2025.
• Depreciation and amortization: $58 million for the three months ended June 30, 2026, up from $54 million in 2025. For the six months ended June 30, 2026, depreciation and amortization expenses were $116 million, up from $108 million in 2025.
• Taxes other than income: $36 million for the three months ended June 30, 2026, up from $33 million in 2025. For the six months ended June 30, 2026, taxes other than income were $74 million, up from $70 million in 2025.

Operating Income

Operating income for the three months ended June 30, 2026, was $23 million, a decrease from $35 million in 2025. For the six months ended June 30, operating income was $328 million in 2026, slightly down from $332 million in 2025.

Other (Income) and Deductions

For the three months ended June 30, 2026, total other (income) and deductions were $28 million, up from $27 million in 2025. For the six months ended June 30, total other (income) and deductions were $61 million in 2026, up from $56 million in 2025.

Key Components of Other (Income) and Deductions

• Interest expense: $35 million for the three months ended June 30, 2026, up from $32 million in 2025. For the six months ended June 30, 2026, interest expense was $70 million, up from $64 million in 2025.
• Interest income: - $3 million for the three months ended June 30, 2026, compared to - $4 million in 2025. For the six months ended June 30, 2026, interest income was - $4 million, compared to - $6 million in 2025.
• Other income: - $4 million for the three months ended June 30, 2026, compared to - $3 million in 2025. For the six months ended June 30, 2026, other income was - $6 million, compared to - $4 million in 2025.

Income (Loss) Before Income Taxes

Income (loss) before income taxes was - $5 million for the three months ended June 30, 2026, compared to $8 million in 2025. For the six months ended June 30, it was $267 million in 2026, down from $276 million in 2025.

Income Tax Expense (Benefit)

Income tax expense (benefit) was - $1 million for the three months ended June 30, 2026, compared to $2 million in 2025. For the six months ended June 30, it was $62 million in 2026, down from $65 million in 2025. The effective income tax rate was 21.1% for the three months ended June 30, 2026, and 23.2% for the six months ended June 30, 2026.

Net Income (Loss)

Net income (loss) was - $4 million for the three months ended June 30, 2026, compared to $6 million in 2025. For the six months ended June 30, net income was $205 million in 2026, down from $211 million in 2025.

Comprehensive Income (Loss)

Comprehensive income (loss) was - $4 million for the three months ended June 30, 2026, compared to $6 million in 2025. For the six months ended June 30, comprehensive income was $205 million in 2026, down from $211 million in 2025.

Cash Flow from Operating Activities

Net cash from operating activities for the six months ended June 30, 2026, was $619 million, a slight decrease from $628 million in 2025.

Cash Flow from Investing Activities

Net cash used for investing activities for the six months ended June 30, 2026, was - $443 million, an improvement from - $546 million in 2025. Plant and equipment expenditures were - $347 million in 2026, up from - $276 million in 2025.

Cash Flow from Financing Activities

Net cash used for financing activities for the six months ended June 30, 2026, was - $192 million, significantly higher than - $82 million in 2025. Dividends paid on common stock were - $112 million in 2026, compared to - $110 million in 2025.

Cash and Cash Equivalents

Cash and cash equivalents at the end of the period were $15 million as of June 30, 2026, compared to $0 million as of June 30, 2025. The net decrease in cash and cash equivalents for the six months ended June 30, 2026, was - $16 million.

Financial Position (as of June 30, 2026)

• Total Assets: $8,998 million, up from $8,905 million as of December 31, 2025.
• Current Assets: $469 million, down from $633 million as of December 31, 2025. Cash and cash equivalents were $15 million, down from $31 million, and customer accounts receivable were $212 million, down from $422 million.
• Property, plant, and equipment (net): $7,378 million, up from $7,140 million as of December 31, 2025. Gross property, plant, and equipment increased to $9,517 million from $9,212 million.
• Total Liabilities and Shareholder’s Equity: $8,998 million, up from $8,905 million as of December 31, 2025.
• Current Liabilities: $389 million, down from $449 million as of December 31, 2025. Accounts payable to affiliates were $38 million, up from $30 million, and other accounts payable were $228 million, up from $208 million. Short-term borrowings — other decreased from $80 million to $0 million.
• Long-Term Debt: $3,043 million, unchanged from December 31, 2025, which includes a $1.6 billion loan from the U.S. Department of Energy’s Office granted in June 2026 with no draws as of June 30, 2026.
• Total Shareholder’s Equity: $3,209 million, up from $3,116 million as of December 31, 2025.

Other Metrics

• Allowance for doubtful accounts: $33 million as of June 30, 2026, increased from $17 million as of December 31, 2025. The current period provision for credit losses was $28 million for the six months ended June 30, 2026.
• Uncollectible expense: $14 million for the three months ended June 30, 2026, up from $7 million in 2025. For the six months ended June 30, 2026, it was $28 million, up from $23 million in 2025.
• Allocated Stock-Based Compensation: DTE Gas Company received an allocation of $3 million for the three months ended June 30, 2026, unchanged from 2025, and $7 million for the six months ended June 30, 2026, up from $6 million in 2025.
• Long-term debt covenant: As of June 30, 2026, DTE Gas Company’s total funded debt to total capitalization ratio was 0.49 to 1, in compliance with the covenant of no more than 0.65 to 1.
• Environmental Remediation: DTE Gas Company had $25 million accrued for remediation of contaminated sites as of June 30, 2026, and December 31, 2025.
• Labor Contracts: Approximately 2% of DTE Gas Company’s 1,150 represented employees have contracts expiring within one year.

Outlook / Guidance

DTE Gas Company filed a rate case with the MPSC on November 13, 2025, requesting a net increase in base rates of $163 million and an increase in return on equity from 9.8% to 10.25%, with a final MPSC order expected in September 2026. Annual capital expenditures for 2026 are expected to be approximately $900 million. The company does not expect a significant financial impact in the near term from finalized National Ambient Air Quality Standards for fine particulate matter, and does not anticipate making contributions to qualified pension or postretirement benefit plans in 2026, though it expects to transfer up to $25 million from its non-represented qualified pension plan to DTE Electric Company during 2026.