As of 2022, 54.16% of DTE's electricity was generated from coal, 18.16% from nuclear, 14.22% from natural gas and 13.11% from renewable energy including wind, solar and hydroelectric.

In 1905, a majority of the Detroit City Gas Co. was acquired by the American Light & Traction Co., a holding company that controlled utility and transportation interests stretching from Grand Rapids to Milwaukee.

In 1913, Detroit City Gas acquired additional service territory that included the communities of River Rouge, Wyandotte, Dearborn, Ecorse and Trenton.

Between 1924 and 1929, Detroit Edison increased its production capacity by building the Marysville, Trenton Channel and Delray 3 power plants.

The merger, approved in 1938 by state and federal regulators, created one gas provider for most of the southern half of the Lower Peninsula.

Construction also began in 1972 on the Greenwood Energy Center — the company's first inland plant designed for both oil - and nuclear-fueled generating units.

In 1986, the Detroit Edison Foundation was formed to manage the company's charitable giving programs and volunteer efforts that had grown over the years.

The first DTE Energy-owned and constructed wind parks were commissioned (connected to the grid and generating power) in December 2012.

According to a statement released by the White House on Nov 18, 2021, DTE Energy participated in the American Rescue Plan by committing to help customers during the COVID-19 pandemic, by proactively using resources.

The group began by building upon Detroit Edison's (now DTE Electric) existing capabilities and customer relationships to develop non-regulated (non-utility) projects within Michigan.

DTE Energy Trading is an active physical and financial gas, power and environmental marketing company operating in Detroit, Michigan.