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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.

Pioneer Natural Resources Company operates as an independent oil and gas exploration and production company in the United States. The company explores for, develops, and produces oil, natural gas liquids (NGLs), and gas. It has operations in the Midland Basin in West Texas. The company was founded in 1997 and is headquartered in Irving, Texas.

Unum Group, together with its subsidiaries, provides financial protection benefit solutions primarily in the United States, the United Kingdom, Poland, and internationally. It operates through Unum US, Unum International, Colonial Life, and Closed Block segment. The company offers group long-term and short-term disability, group life, and accidental death and dismemberment products; supplemental and voluntary products, such as individual disability, voluntary benefits, and dental and vision products; and accident, sickness, disability, life, and cancer and critical illness products. It also provides group pension, individual life and corporate-owned life insurance, reinsurance pools and management operations, and other miscellaneous products. The company sells its products primarily to employers for the benefit of employees. It sells its products through field sales personnel, independent brokers, consultants, and independent contractor agent sales force and brokers. Unum Group was founded in 1848 and is based in Chattanooga, Tennessee.