Robert Frenzel

Northern States Power Co. engages in the generation, transmission, distribution and sale of electricity. It supplies electricity to the portions of northwestern Wisconsin and the western portion of the Upper Peninsula of Michigan. The company purchases, transports, distributes and sells natural gas to retail customers and transports customer-owned natural gas. Its large commercial and industrial electric retail customers include food products, paper, allied products and sand mining for oil and gas extraction industries. Northern States Power was founded in 1901 and is headquartered in Eau Claire, WI.

Public Service Company of Colorado engages in the of generation, purchase, transmission, distribution, and sale of electricity in Colorado. It operates through the following segments: Regulated Electric Utility, Regulated Natural Gas Utility, and All Other. The Regulated Electricity segment generates electricity which is transmitted and distributed in Colorado. It also comprises sales for resale and provides wholesale transmission service to various entities in the United States. The Regulated Natural Gas Utility segment focuses in the transportation, storage, and distribution of natural gas in portions. The company was founded in 1924 and is headquartered in Denver, CO.

Southwestern Public Service Co. engages in the provision of electricity services. The firm generates, purchases, transmission, distributes, and sales electricity in portions of Texas and New Mexico. It offers oil and gas extraction, petroleum, and coal products. The company was founded in 1921 and is headquartered in Amarillo, TX.

Northern States Power Co. engages in the generation, purchase, transmission, distribution and sale of electricity. It operates through the following segments: Regulated Electric, Regulated Natural Gas, and Other. The Regulated Electric segment generates electricity which is transmitted and distributed in Minnesota, North Dakota and South Dakota. The Regulated Natural Gas segment includes transports, stores, and distributes natural gas in portions of Minnesota and North Dakota. The company was founded in 1909 and is headquartered in Minneapolis, MN.

Luminant Holding Co. LLC operates as a holding company with interest in power generation business with plant, mine, wholesale marketing and trading, and development operations. The company is headquartered in Dallas, TX.

Arthur Andersen LLP used to provide accounting services. It was also into consulting services for clients that operate businesses throughout the United States and around the world. Arthur Andersen was founded in 1913 and was headquartered in Chicago, IL.