Hours Of Operations NorthWestern Energy Montana Great Falls NorthWestern Energy Hours of Operation and Locations in Great Falls, MT 4.8 - 111 votes 1 Locations in Great Falls www.northwesternenergy.com NorthWestern Energy Hours Category: Home & Garden NorthWestern Energy - Great Falls, MT 59404 6700 Rainbow Dam Rd(406) 268-2300 View Store Details Explore Great FallsView More Apparel Sam's ClubRoss Dress for LessKmartBig LotsCarhartt Sports TargetVansColemanSnap FitnessLady Foot Locker Jewelry Sam's ClubKay JewelersAvonBon-TonJensen Jewelers Recommend For You NSTAR Orlando Utilities Commission Otter Tail Power Company Peoples Gas Pepco Runnings Farm & Fleet Tucson Electric Power United Power Urgent Care of Connecticut Aero Energy