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Unitil Corporation (Unitil) is a public utility holding company. Unitil's principal business is the retail distribution of both electricity and natural gas in New Hampshire and Massachusetts, and the retail distribution of natural gas in Maine. Unitil has three retail distribution utility subsidiaries: Unitil Energy Systems, Inc., Fitchburg Gas and Electric Light Company, and Northern Utilities, Inc. (Northern). Unitil's retail distribution utilities serve approximately 170,000 customers in their franchise areas. Granite State Gas Transmission, Inc. (Granite State), an interstate natural gas transmission pipeline company, was acquired by Unitil, along with Northern, from NiSource Inc. in December 2008. Unitil also provides energy brokering and advisory services to large commercial and industrial customers throughout the northeastern United States through its non-regulated business segment, Unitil Resources, Inc. and its subsidiary, Usource, LLC.