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AEE: Ameren Corporation, through its subsidiaries, operates as a public utility company in Missouri and Illinois, the United States. It engages in rate-regulated electric generation, transmission, and distribution businesses; rate-regulated natural gas transmission and distribution businesses; and merchant generation businesses. The company was founded in 1881 and is headquartered in St. Louis, Missouri.

UTL: Unitil Corporation, a public utility holding company, engages in the distribution of electricity and natural gas in the states of New Hampshire, Massachusetts, and Maine. It also operates 87 miles of interstate underground natural gas transmission pipeline that provides interstate natural gas pipeline access and transportation services in New Hampshire and Maine service territory. In addition, the company provides energy brokering and advisory services to commercial and industrial customers in the northeastern United States. It serves approximately 100,900 electric and 70,800 natural gas customers. The company was incorporated in 1984 and is headquartered in Hampton, New Hampshire.

VVC: Vectren Corporation provides energy delivery services to residential, commercial, and industrial and other customers in Indiana and west central Ohio. It provides natural gas distribution and transportation services in Indiana and west central Ohio; and electric distribution services primarily in southwestern Indiana. The company also owns and operates gas electric generation plants with an installed generating capacity of 1,298 megawatts. Its electric transmission system consists of 932 circuit miles of 138,000 and 69,000 volt lines, 34 substations; and distribution system includes 4,200 pole miles of lower voltage overhead lines and 358 trench miles of conduit containing 2,000 miles of underground distribution cable, 97 distribution substations, and 54,000 distribution transformers. In addition, the company provides gas marketing, gas portfolio optimization, and other portfolio and energy management services to municipalities, utilities, industrial operations, schools, and healthcare institutions located in the midwest and southeast United States. Further, it mines and sells coal; and provides underground construction and repair, performance contracting, and renewable energy services, as well as invests in energy-related opportunities and services, real estate, and leveraged leases. Vectren Corporation serves various industries, including automotive assembly, parts, and accessories; feed, flour, and grain processing; metal castings; aluminum products; appliance manufacturing; polycarbonate resin and plastic products; gypsum products; electrical equipment; metal specialties; glass; steel finishing; pharmaceutical and nutritional products; gasoline and oil products; and ethanol and coal mining. As of December 31, 2009, it supplied natural gas service to approximately 993,100 customers; and electric service to approximately 141,400 customers. The company was founded in 1912 and is headquartered in Evansville, Indiana.