CMS Energy

CMS Energy is an energy holding company whose primary subsidiary is Consumers Energy, an electric and natural gas utility serving customers in Michigan. Consumers Energy participates in the Green Button Connect My Data (GBCMD) program, exposing customer-authorized energy usage data to third parties via OAuth 2.0 - typically brokered through UtilityAPI - for use in energy management, demand response, EV charging, solar, and sustainability applications.