Exhibit 99.1 DTE Energy reports third quarter accomplishments, investments and earnings; provides 2026 early outlook DETROIT, Oct. 30, 2025 — DTE Energy (NYSE: DTE) invested nearly $3 billion in its utilities through the third quarter of 2025 and remains on target to invest a total of$4.4 billion this year. These investments are focused on upgrading and modernizing the company's electric and natural gas infrastructure and transitioning to cleaner power generation to provide its customers with energy that i ...