Avangrid, Inc. operates as an energy services holding company in the United States. It engages in the generation, transmission, and distribution of electricity, as well as distribution, transportation, and sale of natural gas. As of December 31, 2016, the company delivered electricity to approximately 2.2 million electric utility customers, as well as natural gas to approximately 992,000 natural gas public utility customers; and owned approximately 67.5 billion cubic feet of net working gas storage capacity. It also develops, constructs, and operates renewable energy generation facilities primarily using onshore wind power, as well as solar, biomass, and thermal power. The company delivers natural gas and electricity to residential, commercial, and institutional customers through its regulated utilities in New York, Maine, Connecticut, and Massachusetts; and sells its output to investor-owned utilities, public utilities, and other credit-worthy entities. It also generates and provides power and other services to federal and state agencies, as well as institutional retail and joint action agencies; and delivers thermal output to wholesale customers in the Western United States. The company was formerly known as Iberdrola USA, Inc. Avangrid, Inc. was founded in 1852 and is headquartered in New Haven, Connecticut. Avangrid, Inc. is a subsidiary of Iberdrola, S.A.