EXHIBIT 21 WISCONSIN POWER AND LIGHT AND SUBSIDIARIES The material subsidiaries of WP&L as of December 31, 1995, are as follows: % of Voting Stock Owned Directly or State of Indirectly by Name of Subsidiary Incorp. WP&L 1. South Beloit Water, Gas and Electric Company Illinois 100% 2. REAC, Inc Wisconsin 100% 3. Wisconsin River Power Company Wisconsin 33-1/3% 4. Wisconsin Valley Improvement Company Wisconsin 13%