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Investor-Owned Electric Companies

Black Hills Energy
7001 Mt. Rushmore Rd.
Rapid City, SD 57702
Phone: (605) 721-2660
Toll-Free: 1-888-890-5554

MidAmerican Energy Co.
PO Box 657
Des Moines, IA 50306-0657
Toll-Free: 1-888-427-5632

Montana-Dakota Utilities Co.
400 N. Fourth St.
Bismarck, ND 58501-4092
Phone: (701) 222-7900
Toll-Free: 1-800-638-3278

NorthWestern Energy
3010 W. 69th St.
Sioux Falls, SD 57108
Toll-Free: 1-800-245-6977

Otter Tail Power Co.
215 S. Cascade St.
Fergus Falls, MN 56537-2897
Phone: (218) 739-8877
Toll-Free: 1-800-257-4044

Xcel Energy
500 W. Russell St.
PO Box 988
Sioux Falls, SD 57101-0988
Toll-Free: 1-800-895-4999