States › Minnesota › Otter Tail Power Co

investor-owned utility · EIA utility 14232

Otter Tail Power Co

104,633 residential customers in 3 states · 75 counties in territory · balancing authority MISO

Form EIA-861, 2024 finalMonthly to Jul 2026

Average residential price, 2024. Dial position: 16% of 1,230 US utilities had this price or lower. Ticks: Minnesota and US averages.

Average price is revenue divided by sales for the sector and year; it is not a tariff rate. Reliability figures are as reported by utilities to EIA on Form 861 and may use different calculation methods. Annual figures: Form EIA-861 for 2024, final release. Monthly state figures run to July 2026.

Otter Tail Power Co serves 104,633 residential customers in Minnesota and 2 other states as an investor-owned utility, according to its 2024 Form EIA-861 filing, with a service territory that touches 75 counties.

Its average residential price that year was 11.32¢ per kilowatthour, 27% below the Minnesota average of 15.45¢ and 31% below the US average of 16.48¢. The figure is residential revenue divided by residential sales, so it folds in fixed charges, riders and every rate schedule the utility bills under.

That works out to an average residential bill of $105.86 a month on average use of 935 kWh a month. Across Minnesota the average bill was $110.06 on 712 kWh, so a bill gap reflects how much power households use as well as what each kilowatthour costs.

For reliability it reported a SAIDI of 160.2 minutes per customer with major event days included and 130.1 minutes with them excluded, calculated under IEEE 1366 standard. The median among Minnesota utilities reporting was 76.7 minutes with major event days; this utility's figure is 109% above that median.

The average price is up 11.7% on 2019, against up 18.5% for Minnesota as a whole, and up 5.2% on 2023.

11.32¢average residential price per kWhMinnesota 15.45¢ · US 16.48¢

$105.86average monthly residential billon 935 kWh a month

104,633residential customers134,397 customers in all sectors

160.2SAIDI minutes per customer, all eventsMinnesota median 76.7

Compared with Minnesota, the US and other investor-owned utilities

Measure, 2024	This utility	Investor-owned utilities, US median	Minnesota	United States
Average residential price per kWh	11.32¢	16.17¢	15.45¢	16.48¢
Average monthly residential bill	$105.86	$131.47	$110.06	$142.26
Average monthly use, kWh	935	787	712	863
Residential price change, 1 year	+5.2%	—	+4.9%	+3.0%
Residential price change, 5 years	+11.7%	—	+18.5%	+26.7%
SAIDI, all events (minutes)	160.2	278.7	76.7 median	184.5 median
SAIDI, without major event days	130.1	106.5	56.9 median	99.8 median

State and US prices, bills and use are EIA's own averages over every customer. The ownership column and the reliability columns are medians across utilities with at least 1,000 residential customers, computed on this site from the final 2024 file. Among the 4 filings by investor-owned utilities in Minnesota, the median price was 15.66¢. In Minnesota this utility's price ranks 41 of 44, counting from the highest.

Average price by year

Otter Tail Power CoMinnesota averageUS average

Cents per kWh, nominal.

Year by year

Year	¢ per kWh	Minnesota ¢	Monthly bill	kWh a month	Residential customers	All sales
2024	11.32¢	15.45¢	$105.86	935	104,633	5.7 TWh
2023	10.76¢	14.73¢	$107.63	1,000	104,522	5.8 TWh
2022	10.99¢	14.25¢	$114.92	1,045	104,377	5.6 TWh
2021	11.05¢	13.50¢	$109.69	992	104,287	4.8 TWh
2020	10.00¢	13.17¢	$101.49	1,015	103,934	4.8 TWh
2019	10.13¢	13.04¢	$106.43	1,051	103,329	5 TWh
2018	9.65¢	13.14¢	$103.19	1,069	102,992	5 TWh
2017	9.45¢	13.04¢	$95.11	1,007	102,901	4.8 TWh
2016	9.48¢	12.67¢	$93.96	991	102,686	4.8 TWh
2015	9.13¢	12.12¢	$94.88	1,039	102,126	4.6 TWh
2014	9.02¢	12.01¢	$102.01	1,131	102,771	4.7 TWh
2013	8.23¢	11.81¢	$93.36	1,135	101,257	4.5 TWh

Bundled residential service only in the price, bill and use columns. Bill = residential revenue ÷ customers ÷ 12; use = residential sales ÷ customers ÷ 12.

Month by month

Otter Tail Power Co (MN)Minnesota average

Form EIA-861M monthly sample, bundled residential service in Minnesota. Preliminary until EIA finalises the year. Latest: 14.31¢ in July 2026, average bill $135.10 on 944 kWh.

Sales by sector, 2024

Sector	Customers	Sales	Share of sales	Revenue	¢ per kWh, bundled
Residential	104,633	1.2 TWh	21%	$132,922,700	11.32¢
Commercial	29,751	3.3 TWh	58%	$251,500,500	7.66¢
Industrial	13	1.2 TWh	22%	$66,296,000	5.42¢

Customers, sales and revenue count every service type the utility reported (bundled, energy-only and delivery-only). The price column uses bundled service alone, because part-bill revenue would understate it. Sources of energy: 6 TWh in total, of which 54.4% was its own net generation and 3 TWh was bought wholesale; summer peak demand 808 MW.

By state

State	Residential customers	¢ per kWh	State average ¢	Monthly bill	SAIDI, all events
Minnesota	50,118	11.33¢	15.45¢	$95.49	155.0
North Dakota	45,467	11.38¢	11.51¢	$116.12	170.7
South Dakota	9,048	10.93¢	12.86¢	$111.78	134.7

Reliability

SAIDI, all events160.2 min

SAIDI, without major event days130.1 min

Minutes of sustained interruption per customer in 2024, as the utility reported them under IEEE 1366 standard. SAIFI: 1.33 interruptions per customer with major event days, 1.12 without; CAIDI 120.5 minutes per interruption. EIA's Minnesota total across all reporting utilities was 219.6 minutes with major event days and 92.2 without. Major event days are storms and similar events that a utility's chosen method sets apart; methods differ, so treat comparisons as approximate. What SAIDI and SAIFI mean.

Year	SAIDI, all events	SAIDI, no major events	SAIFI, all events	SAIFI, no major events	Method
2024	160.2	130.1	1.33	1.12	IEEE 1366
2023	148.2	111.9	1.65	1.52	IEEE 1366
2022	236.3	126.0	2.04	1.76	IEEE 1366
2021	95.6	79.2	1.26	1.20	IEEE 1366
2020	104.4	104.4	1.51	1.51	IEEE 1366
2019	181.5	181.5	1.59	1.59	IEEE 1366
2018	124.1	111.4	1.37	1.27	IEEE 1366
2017	100.7	83.3	1.57	1.49	IEEE 1366
2016	222.9	108.6	3.18	3.03	IEEE 1366
2015	107.6	107.6	3.62	3.62	IEEE 1366
2014	90.5	90.5	2.45	2.45	IEEE 1366
2013	83.4	83.4	2.22	2.22	IEEE 1366

Generation at plants it operates, 2025

Coal 69.7% 4.2 TWh
Wind 18.7% 1.1 TWh
Natural gas 10% 597.5 GWh
Solar 1.2% 73.3 GWh
Petroleum 0.2% 11.8 GWh
Hydro 0.1% 3.6 GWh

Net generation of 6 TWh at power plants this utility operates, from Form EIA-923. It is not the mix delivered to customers: utilities also buy power wholesale (3 TWh in 2024), sell generation to others and may co-own plants that another company operates.

Counties in its service territory

Counties the utility listed on Form EIA-861 for 2024. Listing a county does not mean the utility serves all of it.

Other utilities in Minnesota

Utility	Ownership	Residential customers	¢ per kWh	Monthly bill	SAIDI, all events	SAIDI, no major events
ALLETE, Inc.	Investor-owned	125,896	15.66¢	$101.99	119.9	119.9
Northern States Power Co - Minnesota	Investor-owned	1,405,248	16.38¢	$99.40	279.2	103.8
Dakota Electric Association	Cooperative	108,097	14.00¢	$100.25	25.5	17.4
Connexus Energy	Cooperative	134,095	13.66¢	$105.48	181.3	30.1
East Central Energy	Cooperative	60,432	16.87¢	$137.27	178.4	84.0
Rochester Public Utilities	Municipal	54,943	17.91¢	$100.35	102.1	42.8
Wright-Hennepin Coop Elec Assn	Cooperative	53,714	14.59¢	$130.85	45.4	23.7
Lake Country Power	Cooperative	47,204	17.90¢	$148.34	372.5	187.8

All Minnesota utilities · Investor-owned utilities nationwide

Questions and answers

How much does electricity cost from Otter Tail Power Co?

Residential customers paid an average of 11.32¢ per kilowatthour in 2024. EIA derives this by dividing residential revenue by residential sales; it is an average across all rate schedules and charges, not a tariff rate.

How does that compare with Minnesota?

The Minnesota average residential price in 2024 was 15.45¢ and the US average 16.48¢; Otter Tail Power Co was 27% below the state figure. Among 44 utility filings with a bundled residential price in Minnesota, it had the 41st highest.

What is the average Otter Tail Power Co bill?

$105.86 a month in 2024, on average residential use of 935 kWh a month (annual revenue and sales divided by customers and by twelve). The Minnesota average was $110.06 on 712 kWh.

How reliable is Otter Tail Power Co service?

It reported 160.2 minutes of interruption per customer (SAIDI) including major event days and 130.1 minutes excluding them, with 1.33 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.

Is the Otter Tail Power Co price rising?

The average residential price was up 5.2% in 2024 compared with 2023 and up 11.7% compared with 2019.

Which counties does Otter Tail Power Co serve?

Its Form EIA-861 service territory lists 75 counties, including Becker County, MN, Beltrami County, MN, Big Stone County, MN, Cass County, MN, Chippewa County, MN and Clay County, MN. A county can appear in several utilities' territories.

Provenance

Source: U.S. Energy Information Administration. Annual figures are from Form EIA-861 (sales to ultimate customers, reliability, operational data and service territory files), final release for 2024, respondent "Otter Tail Power Co", utility number 14232. Monthly utility figures are from the Form EIA-861M sample. State and US averages are from the Form EIA-861M sales and revenue workbook, published through July 2026. Generation by fuel is from Form EIA-923, 2025 final. All are US government works in the public domain. Page built 30 Sep 2026. Errors in processing are corrected at the next build; see corrections. For tariffs and rate schedules, consult the utility or the state utility commission.