Otter Tail Power Co. electricity rates
Investor-owned utility · South Dakota
Otter Tail Power Co. is a for-profit, investor-owned utility regulated by the state utility commission, serving 9,094 homes in South Dakota. Its residential customers pay an average of 11.63¢/kWh including fixed and delivery charges, 35% less than the U.S. average.
Rate basis: EIA-861M monthly utility data, 12 months ending 2026-07.
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Otter Tail Power Co. bill estimates
| Monthly use | At average all-in rate |
|---|---|
| 500 kWh | $58.15 |
| 1,000 kWh | $116.30 |
| 1,500 kWh | $174.45 |
| 2,000 kWh | $232.60 |
Otter Tail Power Co. residential rate plans
| Plan | Effective | Customer charge | Energy charges |
|---|---|---|---|
| Residential Service (Rate code 101)time-of-use | 2018-08-01 | $14.00 | 10.2¢ (12am–12am) — summer weekdays |
| Residential Demand Control Service (Rate 241)time-of-use | 2018-07-31 | $18.38 | 5.6¢ (12am–12am) — summer weekdays |
| Residential Service (Rate Code 101)time-of-use | 2018-06-01 | $9.75 | 11.3¢ (12am–12am) — summer weekdays |
| Residential Demand Control Service (Rate Code 241)time-of-use | 2014-07-01 | $16.00 | 4.8¢ (12am–12am) — summer weekdays |
| Farm Service (Rate code 361)time-of-use | 2014-07-01 | $14.00 | 8.1¢ (12am–12am) — summer weekdays |
| Off Peak Water Heating (Rate code 191)time-of-use | 2014-07-01 | $2.00 | 6.1¢ (12am–12am) — summer weekdays |
| Residential Demand Control Service( Rate Code 241)time-of-use | 2014-07-01 | $13.00 | 4.8¢ (12am–12am) — summer weekdays |
| Off Peak Water Heating (Rate code 191)time-of-use | 2014-07-01 | $2.50 | 6.0¢ (12am–12am) — summer weekdays |
Source: OpenEI U.S. Utility Rate Database. Rates change. Check the linked tariff or your bill for current figures.
Otter Tail Power Co. rate history
2015–2025: +25% change in the average residential rate (9.13¢ → 11.42¢). Annual EIA-861 data.
Outages & reliability
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Reliability history
| 2025 | Otter Tail Power Co. | South Dakota avg | U.S. avg |
|---|---|---|---|
| Outage minutes per customer (SAIDI) | 191 | 257 | 266 |
| Outages per customer (SAIFI) | 1.73 | 1.24 | 1.34 |
| Average restoration time (CAIDI) | 110 min | — | — |
| Outage minutes excluding major storms | 189 | 63 | 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 Otter Tail Power Co.'s counties, customers averaged 2 hr 5 min without power.
| County | Outage min/customer | Days with outages | Peak customers out | Worst day |
|---|---|---|---|---|
| Marshall | 874 | 26 | 692 | 2025-08-16 |
| Roberts | 388 | 41 | 956 | 2025-11-25 |
| Deuel | 376 | 23 | 1,039 | 2025-02-13 |
| Day | 324 | 21 | 1,447 | 2025-11-25 |
| Grant | 312 | 13 | 1,916 | 2025-04-07 |
| Hamlin | 174 | 14 | 930 | 2025-06-28 |
| Moody | 151 | 14 | 352 | 2025-11-21 |
| Kingsbury | 82 | 11 | 319 | 2025-08-16 |
| Lake | 61 | 17 | 893 | 2025-08-17 |
| Brookings | 49 | 14 | 434 | 2025-11-18 |
| Codington | 7 | 6 | 330 | 2025-12-10 |
Otter Tail Power Co. service area
Otter Tail Power Co. serves 11 counties in South Dakota and 68 ZIP codes.
Brookings, Codington, Day, Deuel, Grant, Hamlin, Kingsbury, Lake, Marshall, Moody, Roberts
Cities: Brookings, Watertown, Dell Rapids, Milbank, Sisseton, Flandreau, Volga, Webster, Clear Lake, Britton, De Smet
Programs, smart meters & solar
| Smart meters (AMI) for homes | 100% |
| Customers with daily usage data online | 9,089 |
| Time-based rate programs | Time-of-use rates, Critical peak pricing |
| Homes on time-based rates | 3,415 |
| Net-metered solar homes | 2 |
| Homes in demand response (e.g. thermostat rebates) | 3,675 |
| Residential efficiency incentives paid (2025) | $103,567 |
| Residential energy saved by programs | 834 MWh |
Otter Tail Power Co. at a glance
| Ownership | Investor-owned utility |
| Services | — |
| Commercial rate | 8.33¢/kWh |
| Retail revenue (2025) | $48,471,100 |
| Electricity sold (2025) | 563,968 MWh |
| Balancing authority | MISO |
| EIA utility ID | 14232 |
Other utilities in South Dakota
Frequently asked questions
What is Otter Tail Power Co.'s electricity rate?
Otter Tail Power Co. residential customers pay an average of 11.63¢ per kWh, all charges included (EIA-861M monthly utility data, 12 months ending 2026-07). That's 18% below the South Dakota average of 14.20¢ and 35% below the U.S. average.
What is the average Otter Tail Power Co. electric bill?
About $126 a month. The average Otter Tail Power Co. home uses 1,080 kWh a month. At 1,000 kWh the bill would be about $116.
How many customers does Otter Tail Power Co. have?
Otter Tail Power Co. serves 9,094 residential customers and 12,027 customers in total in South Dakota, across 11 counties.
How reliable is Otter Tail Power Co.?
In 2025, the average Otter Tail Power Co. customer was without power for 3 hr 11 min (SAIDI) over 1.73 interruptions (SAIFI), including major storms. Excluding major event days it was 3 hr 9 min. The South Dakota average was 4 hr 17 min and the U.S. average 4 hr 26 min.
Does Otter Tail Power Co. offer time-of-use rates?
Yes. The OpenEI rate database lists 8 time-of-use residential plans, including Residential Service (Rate code 101). Running big appliances off-peak can cut their cost. Pick the plan in the calculator above to see by how much.
Does Otter Tail Power Co. offer net metering for solar?
Otter Tail Power Co. had 2 residential net-metered customers in 2025 with 0.0 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 Otter Tail Power Co. before making decisions.