Montana-Dakota Utilities Co
Investor Owned electric utility · North Dakota · #182 of 3,199 U.S. utilities by customers · EIA utility #12199
Montana-Dakota Utilities Co is a investor owned electric utility serving 146,550 customers in Montana, North Dakota, South Dakota, Wyoming. In 2025 it sold 4,579 gigawatt-hours of electricity for $360.85M in revenue, an average realized rate of 7.88¢ per kWh across all customer classes and 11.47¢ per kWh for residential customers. Its reported service territory covers 55 counties. EIA records its activities as: generation, transmission, buying transmission, distribution, bundled.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 120,678 | 1,191 | $136.68M | 11.47¢ | |
| Commercial | 25,658 | 2,902 | $186.41M | 6.42¢ | |
| Industrial | 214 | 486 | $37.76M | 7.77¢ | |
| Total | 146,550 | 4,579 | $360.85M | 7.88¢ |
Average realized rate = revenue divided by sales as reported on EIA Form 861. It blends fixed charges, demand charges and riders into one per-kWh figure; it is not the utility's tariff rate. Estimated residential bill assumes the average residential customer's actual 2025 usage (823 kWh/month).
Operations by state
| State | Customers | Sales (GWh) | Residential rate |
|---|---|---|---|
| North Dakota | 94,744 | 3,459 | 11.06¢ |
| Montana | 25,498 | 693 | 12.33¢ |
| Wyoming | 17,864 | 299 | 11.96¢ |
| South Dakota | 8,444 | 129 | 12.99¢ |
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 144,103 | 3,272 | $303.61M | 10.56¢ |
| 2022 | 144,561 | 3,344 | $328.41M | 11.04¢ |
| 2023 | 145,064 | 4,196 | $346.69M | 11.36¢ |
| 2024 | 145,686 | 4,244 | $355.73M | 12.06¢ |
| 2025 | 146,550 | 4,579 | $360.85M | 11.47¢ |
Reliability (2025)
Average outage time (SAIDI): 95 minutes per customer per year
Average outages (SAIFI): 0.81 per customer
Average restoration time (CAIDI): 117 minutes
As reported for North Dakota under the IEEE standard, with major event days included where the standard reports them. Lower is better; see the reliability rankings.
Energy supply (2025)
Net generation: 1,865 GWh
Wholesale power purchased: 3,045 GWh
Winter peak demand: 634 MW
Energy losses: 5.0% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 0.0% of 146,550 meters
Customer-sited generation (net metering): 248 installations, 2.3 MW of capacity
Counties served
Adams, NDBillings, NDBottineau, NDBowman, NDBrown, SDBurke, NDBurleigh, NDCampbell, SDCorson, SDCuster, MTDaniels, MTDawson, MTDay, SDDickey, NDDivide, NDDunn, NDEdmunds, SDEmmons, NDFallon, MTFaulk, SDGolden Valley, NDGrant, NDGrant, SDHarding, SDHettinger, NDJohnson, WYKidder, NDLaMoure, NDLogan, NDMcCone, MTMcIntosh, NDMcKenzie, NDMcPherson, SDMercer, NDMorton, NDMountrail, NDOliver, NDPerkins, SDPotter, SDPrairie, MTRenville, NDRichland, MTRichland, NDRoberts, SDRoosevelt, MTRosebud, MTSheridan, MTSheridan, WYSioux, NDSlope, NDStark, NDWalworth, SDWard, NDWibaux, MTWilliams, ND
Other large utilities in North Dakota
- Cass County Elec Coop Inc - 60,646 customers, residential 12.66¢
- Capital Electric Coop, Inc - 22,758 customers, residential 13.53¢
- Nodak Electric Coop Inc - 21,260 customers, residential 12.69¢
- Mountrail-Williams Elec Coop - 19,199 customers, residential 7.25¢
- Verendrye Electric Coop Inc - 16,815 customers, residential 11.19¢
- Roughrider Electric Cooperativ - 15,326 customers, residential 10.82¢
- McKenzie Electric Coop Inc - 13,829 customers, residential 8.03¢
- Northern Plains Electric Coop - 12,127 customers, residential 10.88¢
All North Dakota utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #12199 in the EIA frame.