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Unitil Corp through its subsidiaries engages in the distribution of electricity and natural gas in its service territories in the states of New Hampshire, Massachusetts and Maine. Its natural gas operations include gas distribution utility operations and interstate gas transmission pipeline operations. It also engages in interstate natural gas transmission pipeline company, operating approximately 85 miles of underground gas transmission pipeline located in Maine and New Hampshire. The company's segments include Electric and Gas.

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.