EXHIBIT 21 WPL HOLDINGS, INC. AND SUBSIDIARIES SUBSIDIARIES The material subsidiaries of the Company as of December 31, 1994, are as follows: % of Voting Stock Owned Directly or State of Indirectly by Name of Subsidiary Incorp. the Company A. Wisconsin Power and Light Company Wisconsin 100% 1. South Beloit Water, Gas and Electric Company Illinois 100% 2. REAC, Inc Wisconsin 100% 3. NUFUS Resources, Inc Wisconsin 100% 4. Wisconsin River Power Company Wisconsin 33-1/3% 5. Wisconsin Valley Improvement Company Wisconsin 13% B. Heartland Development Corporation Wisconsin 97.60% 1. Energy Services A. A&C Enercom Consultants, Inc. Wisconsin 92.72% B. Entec Consulting, Inc. Wisconsin 100% C. Heartland Energy Services, Inc. Wisconsin 100% D. Enserv, Inc. Wisconsin 100% E. Heartland Fuels Corportion Wisconsin 80% 2. Environmental Services A. Environmental Holding Company Wisconsin 90.80% B. RMT, Inc. Wisconsin 100% C. Jones & Neuse, Inc. Wisconsin 100% D. QES, Inc. Wisconsin 100% 3. Affordable Housing A. Heartland Properties, Inc. Wisconsin 100% B. Tool Kit Property Management Systems, Inc. Wisconsin 100% C. Heartland Retirement Services Wisconsin 95.50% D. Capital Square Financial Corp. Wisconsin 100% E. Heartland Capital Co. Wisconsin 47%