Much of their property is on the mainland surrounding West Jefferson Avenue .
The Detroit Edison Company , a present - day subsidiary of DTE Energy , purchased the southern portion of the island and constructed the Trenton Channel Power Plant in 1949 .
Much of DTE Energy 's property is on the mainland surrounding West Jefferson Avenue .
The Detroit Edison Company , a present - day subsidiary of DTE Energy , purchased the southern portion of the island and constructed the Trenton Channel Power Plant in 1949 .