DTE Energy, the coal-reliant Michigan investor-owned utility, has laid out plans to source 40% of its power from renewables by 2050, up from 10% last year, requiring a 6GW build-out that will lean heavily on new wind farms in the state.

Last year DTE announced it would retire 11 of its 17 coal-fired plants by the early 2020s, and the Detroit-based utility has now committed to slashing its carbon emissions 80% by 2050 – citing climate change concerns as its major motivation.