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Fortis owns and operates eight transmission and distribution utility subsidiaries in Canada and the United States, serving 3.5 million electricity and gas customers. The company has smaller stakes in electricity generation and several Caribbean utilities. Subsidiary ITC operates electric transmission in seven US states, with more than 16,000 miles of high-voltage transmission lines in operation.

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.