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Intrastate Natural Gas Distribution Operators – Investor-Owned
MidAmerican Energy Co.
PO Box 657
Des Moines, IA 50306-0657
Toll-Free: 1-800-595-5325
Montana-Dakota Utilities Co.
400 N. Fourth St.
Bismarck, ND 58501
Toll-Free: 1-800-638-3278
NorthWestern Energy
3010 W. 69th St.
Sioux Falls, SD 57108
Toll-Free: 1-800-245-6977
