Mountrail-Williams Elec Coop
Cooperative electric utility · North Dakota · #759 of 3,199 U.S. utilities by customers · EIA utility #20413
Mountrail-Williams Elec Coop is a cooperative electric utility serving 19,199 customers in North Dakota. In 2025 it sold 6,136 gigawatt-hours of electricity for $436.59M in revenue, an average realized rate of 7.12¢ per kWh across all customer classes and 7.25¢ per kWh for residential customers. Its reported service territory covers 6 counties. EIA records its activities as: transmission, buying transmission, distribution.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 11,485 | 206 | $14.92M | 7.25¢ | |
| Commercial | 2,662 | 1,273 | $57.50M | 4.52¢ | |
| Industrial | 5,052 | 4,657 | $364.18M | 7.82¢ | |
| Total | 19,199 | 6,136 | $436.59M | 7.12¢ |
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 (1,493 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 21,055 | 3,724 | $288.85M | 6.95¢ |
| 2022 | 18,582 | 4,090 | $321.49M | 7.20¢ |
| 2023 | 18,949 | 5,672 | $417.12M | 7.18¢ |
| 2024 | 19,043 | 6,298 | $446.43M | 7.24¢ |
| 2025 | 19,199 | 6,136 | $436.59M | 7.25¢ |
Reliability (2025)
Average outage time (SAIDI): 116 minutes per customer per year
Average outages (SAIFI): 1.16 per customer
Average restoration time (CAIDI): 100 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: — GWh
Wholesale power purchased: 6,245 GWh
Winter peak demand: 844 MW
Energy losses: 1.6% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 100.0% of 24,078 meters
Customer-sited generation (net metering): 9 installations, 0.2 MW of capacity
Counties served
Burke, NDDivide, NDMcLean, NDMountrail, NDWard, NDWilliams, ND
Other large utilities in North Dakota
- Montana-Dakota Utilities Co - 146,550 customers, residential 11.47¢
- 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¢
- 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 #20413 in the EIA frame.