Sun Prairie Utilities electricity rates
Municipal utility · Wisconsin · MISO region · MISO
Sun Prairie Utilities is a city-owned municipal utility, governed locally rather than by the state commission, serving 17,082 homes in Wisconsin. Its residential customers pay an average of 12.50¢/kWh including fixed and delivery charges, 31% less than the U.S. average.
Rate basis: EIA-861 2025 annual data, adjusted to the 12 months ending 2026-07 using the state's price trend.
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Sun Prairie Utilities bill estimates
| Monthly use | At average all-in rate | Base tariff charges* |
|---|---|---|
| 500 kWh | $62.50 | $109.65 |
| 1,000 kWh | $125.00 | $204.30 |
| 1,500 kWh | $187.50 | $298.95 |
| 2,000 kWh | $250.00 | $393.60 |
*Residential Three Phase (effective 2014-01-06, $15.00/month customer charge), energy and fixed charges from the OpenEI Utility Rate Database. Riders, fuel adjustments and taxes are often billed separately, so real bills usually land closer to the all-in column. Calculate your bill.
Sun Prairie Utilities residential rate plans
| Plan | Effective | Customer charge | Energy charges |
|---|---|---|---|
| Residential Three Phase | 2014-01-06 | $15.00 | 18.93¢ |
| Residential TOU Three Phasetime-of-use | 2014-01-06 | $15.50 | 13.8¢ (12am–7am, 9pm–12am) · 26.8¢ (7am–9pm) — summer weekdays |
| Residential TOU Single Phasetime-of-use | 2014-01-06 | $7.00 | 13.8¢ (12am–7am, 9pm–12am) · 26.8¢ (7am–9pm) — summer weekdays |
| Residential Single Phase | 2014-01-06 | $7.00 | 18.93¢ |
Source: OpenEI U.S. Utility Rate Database. Rates change. Check the linked tariff or your bill for current figures.
Sun Prairie Utilities rate history
2015–2025: +7% change in the average residential rate (11.30¢ → 12.12¢). Annual EIA-861 data.
Outages & reliability
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Reliability history
| 2025 | Sun Prairie Utilities | Wisconsin avg | U.S. avg |
|---|---|---|---|
| Outage minutes per customer (SAIDI) | 11 | 243 | 266 |
| Outages per customer (SAIFI) | 0.14 | 0.95 | 1.34 |
| Average restoration time (CAIDI) | 75 min | — | — |
| Outage minutes excluding major storms | 11 | 84 | 121 |
Outages in counties served (2025)
From ORNL EAGLE-I, which tracks customers without power every 15 minutes. These counts cover every utility in each county. Weighted across Sun Prairie Utilities's counties, customers averaged 85 min without power.
| County | Outage min/customer | Days with outages | Peak customers out | Worst day |
|---|---|---|---|---|
| Dane | 85 | 16 | 8,497 | 2025-08-10 |
Sun Prairie Utilities service area
Sun Prairie Utilities serves Dane County in Wisconsin and 3 ZIP codes.
Dane
Cities: Sun Prairie, DeForest
Programs, smart meters & solar
| Smart meters (AMI) for homes | 100% |
| Customers with daily usage data online | 17,061 |
| Time-based rate programs | Time-of-use rates |
| Homes on time-based rates | 205 |
| Net-metered solar homes | 333 |
Sun Prairie Utilities at a glance
| Ownership | Municipal utility |
| Services | Distribution |
| Commercial rate | 10.82¢/kWh |
| Industrial rate | 8.48¢/kWh |
| Retail revenue (2025) | $33,207,300 |
| Electricity sold (2025) | 303,535 MWh |
| Peak demand | 69 MW summer · 50 MW winter |
| Line losses | 2.3% |
| Balancing authority | MISO |
| EIA utility ID | 18312 |
Other utilities in Wisconsin
Frequently asked questions
What is Sun Prairie Utilities's electricity rate?
Sun Prairie Utilities residential customers pay an average of 12.50¢ per kWh, all charges included (EIA-861 2025 annual data, adjusted to the 12 months ending 2026-07 using the state's price trend). That's 33% below the Wisconsin average of 18.74¢ and 31% below the U.S. average.
What is the average Sun Prairie Utilities electric bill?
About $76 a month. The average Sun Prairie Utilities home uses 611 kWh a month. At 1,000 kWh the bill would be about $125.
How many customers does Sun Prairie Utilities have?
Sun Prairie Utilities serves 17,082 residential customers and 18,906 customers in total in Wisconsin, across 1 county.
How reliable is Sun Prairie Utilities?
In 2025, the average Sun Prairie Utilities customer was without power for 11 min (SAIDI) over 0.14 interruptions (SAIFI), including major storms. Excluding major event days it was 11 min. The Wisconsin average was 4 hr 3 min and the U.S. average 4 hr 26 min.
Does Sun Prairie Utilities offer time-of-use rates?
Yes. The OpenEI rate database lists 2 time-of-use residential plans, including Residential TOU Three Phase. Running big appliances off-peak can cut their cost. Pick the plan in the calculator above to see by how much.
Does Sun Prairie Utilities offer net metering for solar?
Sun Prairie Utilities had 333 residential net-metered customers in 2025 with 2.9 MW of capacity. Estimate solar savings at this utility's rate.
Sources: EIA-861 2025 and EIA-861M (through July 2026), OpenEI URDB, ORNL EAGLE-I, U.S. Census. Methodology. Spot an error? Rates change often, so confirm with Sun Prairie Utilities before making decisions.