Electricity rates in 57278 — Willow Lake, SD
Homes in ZIP 57278 pay about 14.1¢ per kWh (NorthWestern Energy (SD), Jan–Aug 2026). The South Dakota average is 15.2¢ and the U.S. average 18.2¢ (Aug 2026).
What a month of electricity costs
Monthly cost at the average price of 14.1¢ per kWh. Real bills add or subtract fixed charges, tiers, time-of-use and fuel adjustments.
Where ZIP 57278 is
Outlined: ZIP code area · scroll or pinch to zoomUtilities serving Clark County
| Utility | Home price | Avg. bill | Customers in SD |
|---|---|---|---|
| NorthWestern Energy (SD) Investor Owned · serves Clark County | 14.1¢ Jan–Aug 2026 | $113 | 51,467 |
| Northern Electric Coop, Inc. Cooperative · serves Clark County | 15.3¢ Jan–Aug 2026 | $226 | 5,757 |
| Codington-Clark Elec Coop, Inc. Cooperative · serves Clark County | 9.8¢ 2024 | $385 | 3,457 |
| Kingsbury Electric Coop, Inc. Cooperative · serves Clark County | 14.6¢ 2024 | $366 | 905 |
Utilities are matched to this ZIP code by NREL’s ZIP–utility table and the EIA service-territory list for Clark County; county matches may serve only part of the area. Prices are each utility’s average residential revenue per kWh.
South Dakota price trend
Hover or tap the chart for exact monthly values. Source: EIA-861M (monthly, latest months preliminary); forecast: EIA Short-Term Energy Outlook (October 2026) for the West North Central region, which includes Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, South Dakota.
Averages, not a quote. Prices here are what each utility’s residential customers paid on average (revenue ÷ kWh sold, fixed charges included), as reported to the U.S. Energy Information Administration. Your own rate depends on your plan, season and usage — check your bill or your utility’s tariff.
Questions about 57278
How much does electricity cost in 57278?
About 14.1¢ per kWh for homes (NorthWestern Energy (SD), Jan–Aug 2026, EIA). At 900 kWh a month that is roughly $127.
Who is the electric utility for 57278?
NorthWestern Energy (SD) serves Clark County (EIA service territory), with about 51,467 residential customers in South Dakota; 3 other utilities also serve parts of the area.
Is electricity in SD getting more expensive?
The South Dakota residential average was 15.2¢ per kWh in August 2026, up 9% from a year earlier; the U.S. average was 18.2¢.