Thomas L. Aller

Interstate Power & Light Co. engages in the generation and distribution of electricity and the distribution and transportation of natural gas to retail customers. It operates through the following segments: Electric, Gas, and Other. The Other segment includes steam operations and unallocated portions of the utility business. The company was is headquartered in Cedar Rapids, IA.

Wisconsin Power & Light Co. engages in the generation and distribution of electricity and transportation of natural gas to retail customers in select markets in Wisconsin. The firm has operations in municipalities pursuant to permits of indefinite duration and state statutes authorizing utility operation in areas annexed by a municipality. It operates through the Electric, Gas and Other segments. The company was founded in 1917 and is headquartered in Madison, WI.

Whiting Petroleum Corp. engages in the development, production, acquisition, and exploration of oil and gas properties. It operates in the Rocky Mountains regions. The company was founded by Kenneth R. Whiting and J. Bert Ladd in January 1980 and is headquartered in Denver, CO.

Whiting Oil & Gas Corp. explores, and produces crude oil, natural gas and natural gas liquids. The company is headquartered in Denver, CO.

Alliant Energy Resources LLC supplies electricity. The company is headquartered in Madison, WI.

Part of Legend Corp. Ltd., IES Investments Pty Ltd. is an Australian private holding company for Electronic Solutions Pty Ltd. The company is based in Hendon, Australia. IES Investments was acquired by Legend Corp. Ltd. on November 21, 2006 for $17.66 million.