Official EIA-861 State Grid Summary
South Dakota Power Outage Risk, Electric Utilities & Generator Sizing
South Dakota households average 1.4 hrs/yr (85 minutes/year) of total blackout duration across 0.81 outages/year (Reliability Grade A — Low Outage Risk), with an average residential electricity rate of 13.02 ¢/kWh.
Interactive Appliance Load Calculator
⚡ Home Backup Wattage Sizer for South Dakota
Check the appliances you need to keep running during a blackout. We calculate your continuous running watts, highest motor starting surge, and 20% NEC safety headroom automatically.
Live Sizing Result (+20% Headroom)
3,000 W
Recommended Minimum Generator / Inverter Rating
1,250 WContinuous Running
2,250 WPeak Motor Surge
Top Cities & Towns in South Dakota
Sioux Falls→Rapid→Aberdeen→Brookings→Watertown→Yankton→Mitchell→Huron→Box Elder→Spearfish→Pierre→Vermillion→Brandon→Harrisburg→Tea→Sturgis→Madison→Belle Fourche→Dell Rapids→Hot Springs→Hartford→Milbank→Mobridge→North Sioux→Lead→Summerset→Canton→Winner→Lennox→Chamberlain→Sisseton→Volga→Flandreau→Fort Pierre→Redfield→Beresford→Elk Point→Springfield→Custer→Webster→Parkston→Wagner→Crooks→Deadwood→Groton→Baltic→Salem→Freeman→Miller→Parker→Eagle Butte→Gregory→Platte→Clear Lake→Britton→Garretson→Clark→Aurora→Lemmon→Mission→Tyndall→Gettysburg→De Smet→Piedmont→
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Electric Utilities Operating in South Dakota (EIA Form 861)
| Utility Name | Ownership | Customers | Outages/Yr | Annual Outage Time | Avg Restoration | Residential Rate |
|---|---|---|---|---|---|---|
| Northern States Power Co - Minnesota (#13781) | Investor-Owned | 92,204 | 0.88x/yr | 100 min (1.7h) | 114 min | 13.87 ¢/kWh |
| Black Hills Power, Inc. (#19545) | Investor-Owned | 60,951 | 0.86x/yr | 57 min (1.0h) | 66 min | 14.37 ¢/kWh |
| NorthWestern Energy - (SD) (#13809) | Investor-Owned | 51,467 | 0.70x/yr | 76 min (1.3h) | 108 min | 12.56 ¢/kWh |
| Sioux Valley SW Elec Coop (#17267) | Cooperative | 22,213 | 1.01x/yr | 71 min (1.2h) | 71 min | 12.94 ¢/kWh |
| Southeastern Electric Coop Inc - (SD) (#19293) | Cooperative | 20,160 | 1.00x/yr | 71 min (1.2h) | 100 min | 12.41 ¢/kWh |
| West River Electric Assn Inc (#20401) | Cooperative | 18,423 | 0.53x/yr | 44 min (0.7h) | 82 min | 14.25 ¢/kWh |
| Watertown Municipal Utilities (#20187) | Municipal | 11,633 | 0.06x/yr | 3 min (0.1h) | 58 min | 9.30 ¢/kWh |
| City of Brookings - (SD) (#2285) | Municipal | 10,544 | 0.14x/yr | 11 min (0.2h) | 78 min | 11.12 ¢/kWh |
| Black Hills Electric Coop, Inc (#1769) | Cooperative | 9,227 | 1.03x/yr | 229 min (3.8h) | 222 min | 14.76 ¢/kWh |
| Otter Tail Power Co (#14232) | Investor-Owned | 9,048 | 1.48x/yr | 135 min (2.2h) | 91 min | 10.93 ¢/kWh |
| Butte Electric Coop, Inc (#2655) | Cooperative | 7,265 | 0.81x/yr | 85 min (1.4h) | 104 min | 14.59 ¢/kWh |
| Moreau-Grand Electric Coop Inc (#12915) | Cooperative | 7,153 | 0.81x/yr | 85 min (1.4h) | 104 min | 12.97 ¢/kWh |
| West Central Electric Coop Inc - (SD) (#20368) | Cooperative | 6,801 | 0.81x/yr | 85 min (1.4h) | 104 min | 13.12 ¢/kWh |
| LaCreek Electric Assn, Inc (#10558) | Cooperative | 6,665 | 0.81x/yr | 85 min (1.4h) | 104 min | 11.76 ¢/kWh |
| Central Electric Coop, Inc - (SD) (#3236) | Cooperative | 6,483 | 0.81x/yr | 85 min (1.4h) | 104 min | 13.64 ¢/kWh |
| Montana-Dakota Utilities Co (#12199) | Investor-Owned | 6,367 | 1.44x/yr | 154 min (2.6h) | 107 min | 14.59 ¢/kWh |
| City of Pierre - (SD) (#15040) | Municipal | 6,126 | 0.81x/yr | 85 min (1.4h) | 104 min | 10.65 ¢/kWh |
| Northern Electric Coop, Inc (#13750) | Cooperative | 5,757 | 0.67x/yr | 50 min (0.8h) | 74 min | 11.29 ¢/kWh |
| Grand Electric Coop, Inc (#7484) | Cooperative | 5,247 | 0.81x/yr | 85 min (1.4h) | 104 min | 14.65 ¢/kWh |
| City of Vermillion - (SD) (#19788) | Municipal | 5,034 | 0.81x/yr | 85 min (1.4h) | 104 min | 11.60 ¢/kWh |
| Cherry-Todd Electric Coop, Inc (#3435) | Cooperative | 4,939 | 0.81x/yr | 85 min (1.4h) | 104 min | 11.18 ¢/kWh |
| Rosebud Electric Coop Inc (#16286) | Cooperative | 4,856 | 0.84x/yr | 112 min (1.9h) | 133 min | 10.63 ¢/kWh |
| MidAmerican Energy Co (#12341) | Investor-Owned | 4,236 | 1.19x/yr | 428 min (7.1h) | 360 min | 8.68 ¢/kWh |
| Bon Homme Yankton El Assn, Inc (#1898) | Cooperative | 4,133 | 0.81x/yr | 85 min (1.4h) | 104 min | 11.94 ¢/kWh |
| Clay-Union Electric Corp (#3716) | Cooperative | 3,895 | 0.81x/yr | 85 min (1.4h) | 104 min | 10.90 ¢/kWh |
| H-D Electric Coop Inc (#7870) | Cooperative | 3,829 | 0.81x/yr | 85 min (1.4h) | 104 min | 10.83 ¢/kWh |
| Whetstone Valley Elec Coop Inc (#20422) | Cooperative | 3,658 | 0.81x/yr | 85 min (1.4h) | 104 min | 11.87 ¢/kWh |
| Lake Region Electric Assn, Inc - (SD) (#10632) | Cooperative | 3,468 | 0.81x/yr | 85 min (1.4h) | 104 min | 9.37 ¢/kWh |
| Codington-Clark Elec Coop, Inc (#3850) | Cooperative | 3,457 | 0.81x/yr | 85 min (1.4h) | 104 min | 9.84 ¢/kWh |
| Oahe Electric Coop Inc (#13853) | Cooperative | 3,385 | 0.81x/yr | 85 min (1.4h) | 104 min | 7.66 ¢/kWh |
| Dakota Energy Coop Inc (#4720) | Cooperative | 3,224 | 0.81x/yr | 85 min (1.4h) | 104 min | 15.30 ¢/kWh |
| City of Sioux Falls - (SD) (#17265) | Municipal | 2,936 | 0.81x/yr | 85 min (1.4h) | 104 min | 11.66 ¢/kWh |
| City of Madison - (SD) (#11475) | Municipal | 2,802 | 0.81x/yr | 85 min (1.4h) | 104 min | 11.49 ¢/kWh |
| Charles Mix Electric Assn, Inc (#3315) | Cooperative | 2,660 | 0.81x/yr | 85 min (1.4h) | 104 min | 13.07 ¢/kWh |
| Cam Wal Electric Coop, Inc (#2986) | Cooperative | 2,586 | 0.81x/yr | 85 min (1.4h) | 104 min | 13.34 ¢/kWh |