Otter Tail Power Company (Otter Tail Power Co)
- Last verified (tariff snapshot)
- Feb 25, 2026
- EIA data year
- 2024
- EIA updated
- Mar 4, 2026
- Page updated
- Feb 25, 2026
Otter Tail Power Company, operating as Otter Tail Power Co, is an investor-owned electric utility serving customers in North Dakota. Serves Bismarck, Minot, and areas in ND, SD, MN. Standard Residential Rate 101: $17 customer + $3.50 facilities. Seasonal kWh: 7.109¢ Jun-Sep, 8.070¢ Oct-May. Excludes sales tax, adjustments, riders.
This page brings together tariff-based rate information from our research, federal EIA statistics on sales and generation when available, and the cities and states this provider serves.
Residential rates
Tariff snapshot (Bismarck, ND)
- Customer charge
- $20.50/mo
- Energy charge (example tier)
- 7.75¢/kWh
Seasonal/tiered rates and riders may apply. Example tier used in our estimates.
otpco.com· verified 2026-02-25Example bill at 1,000 kWh (derived from tariff snapshot): $98.00/mo
Based on snapshot; excludes local taxes/fees; riders may vary.
For city-specific estimates (including water, sewer, trash), see Bismarck's full breakdown
Our estimates use tariff and official rate data from utility and regulatory sources. See our methodology for how we calculate bill estimates.
EIA Form 861 & 860 data (2024)
Supplemental data from the U.S. Energy Information Administration. Our tariff-based rates above remain primary for bill estimates. EIA data provides context on scale and generation.
Residential statistics
- Avg. price (EIA)
- 11.32¢/kWh
- EIA "avg price" reflects the full delivered price over the year (including riders/delivery and seasonal effects), so it can be higher than a single tariff energy tier.
- Residential sales
- 1.2M MWh
- Customers
- 104.6K
- Revenue
- $132.9M
Generation mix (capacity)
22.6% renewable · 1,774.9 MW total
- Subbituminous coal450 MW
- Lignite450 MW
- Natural gas399 MW
- Wind350.4 MW
- Distillate oil74.6 MW
- Solar49.9 MW
- Hydroelectric1 MW
Sources: EIA-861 (sales, revenue, customers), EIA-860 (generation).
States & cities served
Cities in our dataset where this provider offers electric service. Click through to see utility cost estimates for each city.
Data sources
- Our research: Tariff documents, PSC/regulatory filings, and official utility rate schedules. Each city page cites sources and last-verified dates.
- EIA (2024): Form 861 (sales, revenue, customers) and Form 860 (generation capacity by fuel). Supplementary context; our tariff-based rates remain primary for bill estimates.
Compare utility costs by state
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Understanding electricity costs
Learn how electric bills are calculated, what drives usage, and how rates vary by market.