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CMS Energy is an energy holding company with three principal businesses. Its regulated utility, Consumers Energy, provides regulated natural gas service to 1.8 million customers and electric service to 1.9 million customers in Michigan. NorthStar Clean Energy, formerly CMS Enterprises, is engaged in wholesale power generation, including contracted renewable energy. CMS sold EnerBank in October 2021.

Southern is one of the largest utilities in the US. The company serves 9 million customers with vertically integrated electric utilities in three states and natural gas distribution utilities in four states. It owns 46 gigawatts of rate-regulated generating capacity, primarily for serving customers in Georgia, Alabama, and Mississippi. Subsidiary Southern Power owns 13 gigawatts of natural gas generation and renewable energy across the US and sells the electricity primarily under long-term contracts.