More companies sign up for DTE MIGreenPower solar program More companies sign up for DTE MIGreenPower solar program Electricity prices initially higher under MIGreenPower, but credits available Other participants include Ford, GM, University of Michigan, Farbman, Detroit Zoo DTE Energy Three new DTE wind parks have recently become operational, two of which are the state's largest and located in Isabella County. Four major companies have joined DTE Energy Co.'s MIGreenPower program, one of the nation's largest voluntary renewable energy programs, in a national movement toward reducing carbon dioxide gases that also has the potential to save on future energy costs.