Hours Of Operations NorthWestern Energy South Dakota Plankinton 57368 NorthWestern Energy Hours of Operation and Location in Plankinton, SD 57368 4.3 - 51 votes 38910 254th St, Plankinton, SD 57368 (605) 942-7246 Get Directions NorthWestern Energy Hours Category: Home & Garden Hours Hours may vary due to season or holiday reasons. For specific hours, please contact store directly. Map Explore PlankintonView More Sports Vans Recommend For You Otter Tail Power Company Runnings Farm & Fleet Ferrellgas Toys R Us A Healing Touch A Nails A New Image A New Look A Perfect 10 A Plus Nails