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Alaska Power & Telephone Company provides energy, telecommunications, and broadband services to the residents, businesses, and communities of rural Alaska. The company operates through Energy and Telecom divisions. The Energy division generates energy using hydro and fossil-fuels. The Telecom division provides voice services, as well as broadband and data transport services. Alaska Power & Telephone Company was founded in 1957 and is headquartered in Port Townsend, Washington.

Black Hills Corporation, through its subsidiaries, operates as an electric and natural gas utility company in the United States. The company operates in two segments: Electric Utilities and Gas Utilities. The Electric Utilities segment generates, transmits, and distributes electricity to approximately 222,000 electric utility customers in Colorado, Montana, South Dakota, and Wyoming; and owns and operates 1,394 megawatts of generation capacity and 9,106 miles of electric transmission and distribution lines. The Gas Utilities segment distributes natural gas to approximately 1,116,000 natural gas utility customers in Arkansas, Colorado, Iowa, Kansas, Nebraska, and Wyoming; owns and operates 4,663 miles of intrastate gas transmission pipelines; 42,514 miles of gas distribution mains and service lines; seven natural gas storage sites; and approximately 50,000 horsepower of compression and 516 miles of gathering lines. It also constructs and maintains customer owned gas infrastructure facilities for gas transportation customers; and provides appliance repair services to residential utility customers, as well as electrical system construction services to large industrial customers. In addition, the company produces electric power through wind, natural gas, and coal-fired generating plants; and coal at its coal mine located near Gillette, Wyoming. Black Hills Corporation was incorporated in 1941 and is headquartered in Rapid City, South Dakota.

Premier Holding Corp. is a holding company, which engages in the provision of energy solutions. The firm operates through its subsidiary companies, Energy Efficiency Experts, Inc. (E3) and The Power Company USA, LLC (TPC). It enables customers to reduce energy consumption, lower operating and maintenance costs, and realize environmental benefits. The company was founded on October 18, 1971 and is headquartered in Tustin, CA.

Principal Solar, Inc. does not have significant operations. It focuses on renewable energy and natural gas sectors. The company is headquartered in Dallas Texas.

Summer Energy Holdings, Inc., through its subsidiaries, operates as a retail electric provider in Texas, Massachusetts, New Hampshire, Ohio, and Illinois. It procures wholesale energy and resells to commercial and residential customers. The company was founded in 2011 and is headquartered in Houston, Texas.