| Aberdeen, City of | Municipalities | SD | UGP | PS | | Ada, City of | Municipalities | MN | UGP | PS | | Adrian, City of | Municipalities | MN | UGP | PS | | Agralite Electric Cooperative | Cooperatives | MN | UGP | PS | | Akron, City of | Municipalities | IA | UGP | PS | | Alexandria, City of | Municipalities | MN | UGP | PS | | Alliant Energy Services, Inc. | Investor-owned Utilities | WI | UGP | PS | | Alta, City of | Municipalities | IA | UGP | PS | | Alton, City of | Municipalities | IA | UGP | PS | | American Electric Power Service Corporation | Power Marketers | OH | UGP | PS | | Anita, City of | Municipalities | IA | UGP | PS | | Ansley, Village of | Municipalities | NE | UGP | PS | | Anthon, City of | Municipalities | IA | UGP | PS | | Arlington, City of | Municipalities | SD | UGP | PS | | Arnold, Village of | Municipalities | NE | UGP | PS | | Atlantic, City of | Municipalities | IA | UGP | PS | | Auburn , City of | Municipalities | NE | UGP | PS | | Auburn, City of | Municipalities | IA | UGP | PS | | Aurelia, City of | Municipalities | IA | UGP | PS | | Aurora, Town of | Municipalities | SD | UGP | PS | | Badger, Town of | Municipalities | SD | UGP | PS | | Barnesville, City of | Municipalities | MN | UGP | PS | | Basin Electric Power Cooperative | Cooperatives | ND | UGP/RM/CRSP | PS/LAP/SLIP | | Beatrice State Development Center | State Agencies | NE | UGP | PS | | Beatrice, City of | Municipalities | NE | UGP | PS | | Beaver City, City of | Municipalities | NE | UGP | PS | | Belcourt & Ft. Totten-BIA | Native American Tribes | ND | UGP | PS | | Benson, City of | Municipalities | MN | UGP | PS | | Beresford, City of | Municipalities | SD | UGP | PS | | Big Horn County Electric Cooperative | Cooperatives | MT | UGP | PS | | Big Stone City, City of | Municipalities | SD | UGP | PS | | Black Hills Power and Light | Investor-owned Utilities | SD | UGP/RM/CRSP | PS/LAP/SLIP | | Black Hills State University | State Agencies | SD | UGP | PS | | Blue Hill, City of | Municipalities | NE | UGP | PS | | Board of Public Utilities | Municipalities | KS | UGP | PS | | Bonneville Power Administration | Federal Agencies | WA | UGP | PS | | Breckenridge, City of | Municipalities | MN | UGP | PS | | Breda, City of | Municipalities | IA | UGP | PS | | Broken Bow, City of | Municipalities | NE | UGP | PS | | Brookings, City of | Municipalities | SD | UGP | PS | | Brown County Rural Electric | Cooperatives | MN | UGP | PS | | Bryant, City of | Municipalities | SD | UGP | PS | | Burke, City of | Municipalities | SD | UGP | PS | | Burwell, City of | Municipalities | NE | UGP | PS | | Callaway, Village of | Municipalities | NE | UGP | PS | | Cambridge, City of | Municipalities | NE | UGP | PS | | Capital Electric Cooperative | Cooperatives | ND | UGP | PS | | Cavalier, City of | Municipalities | ND | UGP | PS | | Central Iowa Power Cooperative | Cooperatives | IA | UGP | PS | | Central Montana Electric Power Cooperative | Cooperatives | MT | UGP | PS |
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