Utility Service Territory

Alliant Energy's wholly-owned subsidiaries - Interstate Power and Light Company, and Wisconsin Power and Light Company - provide electric and natural gas service to more than one million customers in our three-state utility service territory.

You'll find lists of the communities we serve in our regulatory tariffs, or you can contact one of the state regulatory agencies that oversee our operations:

Iowa: Iowa Utilities Board 350 Maple Street Des Moines, IA 50319-0069 1-877-565-4450 Minnesota: Minnesota Public Utilities Commission 121 7th Place E. Suite 350 St. Paul, MN 55101-2147 1-800-657-3782 Wisconsin: Public Service Commission of Wisconsin 610 North Whitney Way P.O. Box 7854 Madison, WI 53707-7854 1-800-225-7729

For more information about our service territory, use our online database to view profiles of more than 300 Alliant Energy communities, with details on demographics, labor force, education, transportation and more.