Electricity rates in 57520 — Agar, SD
Homes in ZIP 57520 pay about 7.7¢ per kWh (Oahe Electric Coop Inc., 2024 average). 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 7.7¢ per kWh. Real bills add or subtract fixed charges, tiers, time-of-use and fuel adjustments.
Where ZIP 57520 is
Outlined: ZIP code area · scroll or pinch to zoomUtilities serving Sully County
| Utility | Home price | Avg. bill | Customers in SD |
|---|---|---|---|
| Oahe Electric Coop Inc. Cooperative · serves Sully County | 7.7¢ 2024 | $703 | 3,385 |
| Dakota Energy Coop Inc. Cooperative · serves Sully County | 15.3¢ 2024 | $246 | 3,224 |
| City of Onida (SD) Municipal · serves Sully County | 11.1¢ 2024 | $144 | 483 |
Utilities are matched to this ZIP code by NREL’s ZIP–utility table and the EIA service-territory list for Sully 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 57520
How much does electricity cost in 57520?
About 7.7¢ per kWh for homes (Oahe Electric Coop Inc., 2024 average, EIA). At 900 kWh a month that is roughly $69.
Who is the electric utility for 57520?
Oahe Electric Coop Inc. serves Sully County (EIA service territory), with about 3,385 residential customers in South Dakota; 2 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¢.