Montana-Dakota Utilities Co. electricity rates
Investor-owned utility · South Dakota
Montana-Dakota Utilities Co. is a for-profit, investor-owned utility regulated by the state utility commission, serving 6,348 homes in South Dakota. Its residential customers pay an average of 13.79¢/kWh including fixed and delivery charges, 23% less than the U.S. average.
Rate basis: EIA-861M monthly utility data, 12 months ending 2026-07.
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Montana-Dakota Utilities Co. bill estimates
| Monthly use | At average all-in rate | Base tariff charges* |
|---|---|---|
| 500 kWh | $68.95 | $65.85 |
| 1,000 kWh | $137.90 | $106.68 |
| 1,500 kWh | $206.85 | $157.51 |
| 2,000 kWh | $275.80 | $208.34 |
*Residential Rate 10 (effective 2017-03-01, $25.02/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.
Montana-Dakota Utilities Co. residential rate plans
| Plan | Effective | Customer charge | Energy charges |
|---|---|---|---|
| Residential Rate 10 | 2017-03-01 | $25.02 | 8.17¢ first 1,000 kWh, 10.17¢ after |
| Optional Time of Day Residential Electric Service (Rate 16)time-of-use | 2017-09-01 | $10.58 | 7.7¢ (12am–12pm, 8pm–12am) · 12.0¢ (12pm–8pm) — summer weekdays |
| Optional Residential Electric Thermal Energy Storage Service (Rate 13)time-of-use | 2017-09-01 | $7.91 | 5.7¢ (12am–12am) — summer weekdays |
| Optional Time of Day Residential Electric Service (Rate 16)time-of-use | 2017-09-01 | $10.58 | 10.5¢ (12am–12pm, 8pm–12am) · 14.7¢ (12pm–8pm) — summer weekdays |
| Optional Residential Electric Thermal Energy Storage Service (Rate 13)time-of-use | 2017-09-01 | $7.91 | 5.7¢ (12am–12am) — summer weekdays |
| Residential Electric Service (Rate 10)time-of-use | 2017-09-01 | $5.17 | 10.3¢ (12am–12am) — summer weekdays |
| Residential Electric Service (Rate 10)time-of-use | 2017-09-01 | $5.17 | 12.9¢ (12am–12am) — summer weekdays |
| Rate 16 Optional Time-Of-Day REStime-of-use | 2017-05-01 | $16.73 | 8.5¢ (12am–12pm, 9pm–12am) · 14.9¢ (12pm–9pm) — summer weekdays |
| RS Rate 10time-of-use | 2017-05-01 | $7.51 | 10.9¢ (12am–12am) — summer weekdays |
| Rate 53 Special Residential Electric Dual Fuel Space Heating Service (CLOSED) | 2017-05-01 | $7.51 | 5.94¢ |
| Special Residential Controlled (Electric Service Rate 11) | 2017-03-01 | $5.42 | 5.80¢ |
Source: OpenEI U.S. Utility Rate Database. Rates change. Check the linked tariff or your bill for current figures.
Montana-Dakota Utilities Co. rate history
2015–2025: +38% change in the average residential rate (9.43¢ → 12.99¢). Annual EIA-861 data.
Outages & reliability
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Reliability history
| 2025 | Montana-Dakota Utilities Co. | South Dakota avg | U.S. avg |
|---|---|---|---|
| Outage minutes per customer (SAIDI) | 212 | 257 | 266 |
| Outages per customer (SAIFI) | 2.62 | 1.24 | 1.34 |
| Average restoration time (CAIDI) | 81 min | — | — |
| Outage minutes excluding major storms | 206 | 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 Montana-Dakota Utilities Co.'s counties, customers averaged 4 hr 1 min without power.
| County | Outage min/customer | Days with outages | Peak customers out | Worst day |
|---|---|---|---|---|
| Harding | 2,928 | 28 | 1,041 | 2025-09-04 |
| Perkins | 1,822 | 19 | 1,147 | 2025-07-24 |
| Roberts | 388 | 41 | 956 | 2025-11-25 |
| Day | 324 | 21 | 1,447 | 2025-11-25 |
| Grant | 312 | 13 | 1,916 | 2025-04-07 |
| Faulk | 188 | 5 | 447 | 2025-06-24 |
| Potter | 150 | 2 | 219 | 2025-05-16 |
| Corson | 139 | 18 | 201 | 2025-08-21 |
| Walworth | 138 | 11 | 721 | 2025-07-10 |
| Brown | 112 | 16 | 1,838 | 2025-10-29 |
| Edmunds | 111 | 10 | 527 | 2025-05-11 |
| McPherson | 80 | 2 | 607 | 2025-05-11 |
| Campbell | 75 | 1 | 226 | 2025-04-02 |
Montana-Dakota Utilities Co. service area
Montana-Dakota Utilities Co. serves 13 counties in South Dakota and 48 ZIP codes.
Brown, Campbell, Corson, Day, Edmunds, Faulk, Grant, Harding, McPherson, Perkins, Potter, Roberts, Walworth
Cities: Aberdeen, Mobridge, Webster, Lemmon, Gettysburg
Programs, smart meters & solar
| Smart meters (AMI) for homes | 0% |
| Time-based rate programs | Time-of-use rates |
| Homes on time-based rates | 1 |
| Net-metered solar homes | 0 reported |
Montana-Dakota Utilities Co. at a glance
| Ownership | Investor-owned utility |
| Services | — |
| Commercial rate | 12.58¢/kWh |
| Industrial rate | 15.36¢/kWh |
| Retail revenue (2025) | $16,021,000 |
| Electricity sold (2025) | 128,802 MWh |
| Balancing authority | MISO |
| EIA utility ID | 12199 |
Other utilities in South Dakota
Frequently asked questions
What is Montana-Dakota Utilities Co.'s electricity rate?
Montana-Dakota Utilities Co. residential customers pay an average of 13.79¢ per kWh, all charges included (EIA-861M monthly utility data, 12 months ending 2026-07). That's 3% below the South Dakota average of 14.20¢ and 23% below the U.S. average.
What is the average Montana-Dakota Utilities Co. electric bill?
About $118 a month. The average Montana-Dakota Utilities Co. home uses 852 kWh a month. At 1,000 kWh the bill would be about $138.
How many customers does Montana-Dakota Utilities Co. have?
Montana-Dakota Utilities Co. serves 6,348 residential customers and 8,444 customers in total in South Dakota, across 13 counties.
How reliable is Montana-Dakota Utilities Co.?
In 2025, the average Montana-Dakota Utilities Co. customer was without power for 3 hr 32 min (SAIDI) over 2.62 interruptions (SAIFI), including major storms. Excluding major event days it was 3 hr 26 min. The South Dakota average was 4 hr 17 min and the U.S. average 4 hr 26 min.
Does Montana-Dakota Utilities Co. offer time-of-use rates?
Yes. The OpenEI rate database lists 8 time-of-use residential plans, including Optional Time of Day Residential Electric Service (Rate 16). Running big appliances off-peak can cut their cost. Pick the plan in the calculator above to see by how much.
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 Montana-Dakota Utilities Co. before making decisions.