Slide 1: Business Update September 28 - 29, 2026
Business Update September 28 - 29, 2026 EXHIBIT 99.1
Slide 2: Safe harbor statement
Safe harbor statement 2 The information contained herein is as of the date of this document. DTE Energy expressly disclaims any current intention to update any forward-looking statements contained in this document as a result of new information or future events or developments. Words such as “antici
Slide 3: Continuing to deliver exceptional results; well positioned for long-term growth
Continuing to deliver exceptional results for our stakeholders; well positioned for long-term growth 3 1. Refer to the appendix for information regarding the reconciliation of operating earnings (non-GAAP) to reported earnings ✓ Highly engaged team committed to delivering best-in-class results for o
Slide 4: Strategic investments and operational execution to improve reliability for customers
Continued focus on strategic investments and operational execution to drive improvement in reliability for our customers Technology and Automation • Installed 730 automatic devices in 2025; 20% more than planned through efficiency gains • Another 500+ additional devices planned for 2026 3 minutes AW
Slide 5: 2026 IRP filing outlines plan for a cleaner, reliable energy future
✓ Reaffirms the retirement of all coal in 2032 • Monroe Power Plant Units 3 and 4 will retire in 2028, followed by Units 1 and 2 in 2032, retiring 3 GW of capacity ✓ Adds combination of resources to support load growth and meet renewable and clean energy standards • 15 GW of renewable energy (solar
Slide 6: Executing on data center opportunities that enhance affordability and drive growth
Executing on data center opportunities that enhance customer affordability and drive growth 1. Refer to the appendix for information regarding the reconciliation of operating earnings (non-GAAP) to reported earnings Proven execution with contracts that protect customers and drive growth 2.4 GW of ex
Slide 7: Data center projects and continuous improvement sustain customer affordability
7 1. Source: Energy Information Administration (EIA). Ending point is the average 12-month rolling residential bill from April 2025 to March 2026 2. Source: EIA and Federal Reserve Economic Data (FRED) Data center projects combined with our continuous improvement culture will sustain our historical
Slide 8: Regulatory strategy focused on delivering value and visibility for customers
Regulatory strategy focused on continuing to deliver value and provide visibility for our customers Integrated Resource Plan (IRP) and Renewable Energy Plan (REP) filings provide visibility into long-term generation and capacity needs • IRP outlines our plan to meet long-term resource needs, includi
Slide 9: Maintaining strong cash flows, balance sheet and credit profile
Maintaining strong cash flows, balance sheet and credit profile 9 Credit ratings S&P Moody’s Fitch DTE Energy (unsecured) BBB Baa2 BBB DTE Electric (secured) A Aa3 A+ DTE Gas (secured) A A1 A Strong balance sheet supports robust customer-focused investment agenda • Customer-focused capital investmen
Slide 10: Well positioned to drive long-term value for shareholders
10 Well positioned to continue to drive long-term value for shareholders while delivering affordable, reliable energy for our customers Strong Long-Term Growth Opportunities Solid Regulatory Construct Reliable and Affordable Energy for our Customers Consistent Financial Results • Met or exceeded ope
Slide 11: Appendix
11 Appendix
Slide 12: Data center opportunities continue to progress; Oracle and Google
12 • Contracts approved by MPSC and construction initiated; demand expected to ramp in the 2027/2028 timeframe • Load ramp supported by existing capacity and new energy storage investments; nearly $2 billion storage investment in plan • 19-year power supply agreement with minimum monthly charges; 15
Slide 13: 2026 operating EPS guidance midpoint provides 7% growth over 2025
2026 operating EPS1 guidance midpoint provides 7% growth over 2025 original guidance midpoint; positioned to achieve high end 13 (millions, except EPS) 2026 operating earnings DTE Electric $1,340 - $1,360 DTE Gas 315 - 325 DTE Vantage 180 - 190 Energy Trading 50 - 60 Corporate & Other (310) - (300)
Slide 14: Data center development and reliability investments drive increase to capital plan
Data center development and investments in reliability and cleaner generation drive significant increase to capital plan; additional data center opportunities provide upside to plan and additional affordability benefits 14 1. Refer to the appendix for information regarding the reconciliation of oper
Slide 15: Capital increase of $6 billion from prior plan
• Capital increase of $6 billion from prior plan is primarily driven by Oracle data center project and other customer-focused initiatives — Incremental storage investment to support data center transaction; fully covered by Oracle — Renewable investment supports continued success of MIGreenPower vol
Slide 16: DTE Gas: replacing aging infrastructure for reliability and safety
DTE Gas: replacing aging infrastructure to ensure reliability and safety for our customers 16 Gas renewal program Base infrastructure $1.5 $1.8 $2.5 $2.7 2025 - 2029 prior plan 2026 - 2030 current plan $4.0 $4.5 DTE Gas investment (billions) • Continuing to improve customer service excellence and pr
Slide 17: DTE Vantage: strategic focus on custom energy solutions projects
DTE Vantage: strategic focus on custom energy solutions projects 17 • Progressing on project development − Began construction on project to design, build, own and operate a combined heat and power project; expecting commercial operation in late 2027 − Continuing to advance the development of a behin
Slide 18: Top tier affordability for our customers
Top tier affordability for our customers over the last 5 years 18 State comparison – electric residential bill change % from 2021 to 20261 Great Lakes average 26.4% U.S. average 27.1% 1st quartile 2nd quartile 3rd quartile 4th quartile 1. Source: Energy Information Administration (EIA). Ending point
Slide 19: ESG efforts are key priorities
Environmental, social and governance (ESG) efforts are key priorities; aspiring to be the best in the industry Environment • Transitioning towards net zero1 emissions at both utilities • Accelerating transition to cleaner generation • Protecting our natural resources Social • Focusing on the diversi
Slide 20: Weather impact on sales
Weather impact on sales Cooling degree days1 Operating earnings2 impact of weather Weather normal sales1 DTE Electric Heating degree days3 Operating earnings2 impact of weather DTE Gas (millions) (per share) 2Q YTD 2Q YTD 2025 $0 $2 $0.00 $0.01 2026 ($19) ($11) ($0.09) ($0.05) (millions) (per share)
Slide 21: Cash flow and capital expenditures guidance
Cash flow and capital expenditures guidance 21 1. Includes equity issued for employee benefit programs. Up to $100 million expected in 2026 2026 guidance DTE Electric Base infrastructure $1,020 Cleaner generation 2,440 Distribution infrastructure 1,760 $5,220 DTE Gas Base infrastructure $590 Gas ren
Slide 22: Reconciliation of reported to operating earnings
Reconciliation of reported to operating earnings (non-GAAP) 22 Use of Operating Earnings Information – Operating earnings exclude non-recurring items, certain mark-to-market adjustments and discontinued operations. DTE Energy management believes that operating earnings provide a meaningful represent