What is the biggest electric company in South Dakota?

Northern States Power Co - Minnesota had the most customers in South Dakota in 2025, about 107,985.

How do I find which utility serves my address in South Dakota?

Open your county page from the South Dakota energy overview. It lists the utilities that report serving each county. Your power bill also names your utility.

Checked Oct 26, 2026

Electric Utilities in South Dakota

73 utilities reported sales in South Dakota for 2025 (EIA Form 861).

Utilities

Customers in this state. Home price and bill are for bundled service (generation and delivery)

Swipe the table sideways to see more columns.

#	Utility	Customers	Home price	Home bill
1	Northern States Power Co - MinnesotaInvestor Owned	107,985	13.13¢/kWh	$101/mo
2	Black Hills Power, Inc.Investor Owned	82,900	15.12¢/kWh	$106/mo
3	NorthWestern Energy - (SD)Investor Owned	65,396	13.35¢/kWh	$125/mo
4	Sioux Valley SW Elec CoopCooperative	26,164	13.94¢/kWh	$176/mo
5	Southeastern Electric Coop Inc - (SD)Cooperative	24,428	12.98¢/kWh	$151/mo
6	West River Electric Assn IncCooperative	21,332	15.16¢/kWh	$136/mo
7	Watertown Municipal UtilitiesMunicipal	14,497	9.29¢/kWh	$82/mo
8	City of Brookings - (SD)Municipal	12,568	10.69¢/kWh	$94/mo
9	Otter Tail Power CoInvestor Owned	12,027	11.42¢/kWh	$123/mo
10	Black Hills Electric Coop, IncCooperative	11,478	14.79¢/kWh	$166/mo
11	Montana-Dakota Utilities CoInvestor Owned	8,444	12.99¢/kWh	$111/mo
12	Butte Electric Coop, IncCooperative	7,472	Not reported	Not reported
13	Central Electric Coop, Inc - (SD)Cooperative	7,397	14.67¢/kWh	$225/mo
14	City of Pierre - (SD)Municipal	7,393	10.94¢/kWh	$99/mo
15	Moreau-Grand Electric Coop IncCooperative	7,161	Not reported	Not reported
16	Northern Electric Coop, IncCooperative	6,938	11.43¢/kWh	$239/mo
17	West Central Electric Coop Inc - (SD)Cooperative	6,815	Not reported	Not reported
18	LaCreek Electric Assn, IncCooperative	6,600	Not reported	Not reported
19	Rosebud Electric Coop IncCooperative	5,697	11.88¢/kWh	$137/mo
20	MidAmerican Energy CoInvestor Owned	5,333	8.90¢/kWh	$99/mo
21	Grand Electric Coop, IncCooperative	5,257	Not reported	Not reported
22	City of Vermillion - (SD)Municipal	5,087	Not reported	Not reported
23	Cherry-Todd Electric Coop, IncCooperative	4,892	Not reported	Not reported
24	Bon Homme Yankton El Assn, IncCooperative	4,190	Not reported	Not reported
25	Clay-Union Electric CorpCooperative	3,917	Not reported	Not reported
26	H-D Electric Coop IncCooperative	3,873	Not reported	Not reported
27	Whetstone Valley Elec Coop IncCooperative	3,698	Not reported	Not reported
28	Dakota Energy Coop IncCooperative	3,645	16.28¢/kWh	$276/mo
29	Codington-Clark Elec Coop, IncCooperative	3,494	Not reported	Not reported
30	Lake Region Electric Assn, Inc - (SD)Cooperative	3,464	Not reported	Not reported
31	City of Madison - (SD)Municipal	3,361	12.41¢/kWh	$131/mo
32	Oahe Electric Coop IncCooperative	3,282	10.54¢/kWh	$170/mo
33	City of Sioux Falls - (SD)Municipal	2,959	Not reported	Not reported
34	Charles Mix Electric Assn, IncCooperative	2,661	Not reported	Not reported
35	Cam Wal Electric Coop, IncCooperative	2,603	Not reported	Not reported
36	FEM Electric Assn, IncCooperative	2,164	Not reported	Not reported
37	Winner Municipal UtilityMunicipal	1,861	Not reported	Not reported
38	Union County Electric Coop IncCooperative	1,685	Not reported	Not reported
39	City of Fort Pierre - (SD)Municipal	1,487	Not reported	Not reported
40	City of FlandreauMunicipal	1,430	Not reported	Not reported
41	City of Volga - (SD)Municipal	1,290	12.79¢/kWh	$119/mo
42	Nebraska Public Power DistrictPolitical Subdivision	1,277	10.08¢/kWh	$124/mo
43	City of BeresfordMunicipal	1,261	Not reported	Not reported
44	Traverse Electric Coop, IncCooperative	1,060	Not reported	Not reported
45	City of Elk PointMunicipal	1,044	Not reported	Not reported
46	City of Miller - (SD)Municipal	982	Not reported	Not reported
47	Kingsbury Electric Coop, IncCooperative	910	Not reported	Not reported
48	Douglas Electric Coop, IncCooperative	823	Not reported	Not reported
49	City of Groton - (SD)Municipal	737	Not reported	Not reported
50	City of Parker - (SD)Municipal	690	Not reported	Not reported
51	City of Tyndall - (SD)Municipal	647	Not reported	Not reported
52	City of Arlington - (SD)Municipal	631	Not reported	Not reported
53	City of Howard - (SD)Municipal	628	Not reported	Not reported
54	City of Wessington SpringsMunicipal	614	Not reported	Not reported
55	City of Aurora - (SD)Municipal	566	Not reported	Not reported
56	City of Onida - (SD)Municipal	494	Not reported	Not reported
57	City of Plankinton - (SD)Municipal	473	Not reported	Not reported
58	City of Burke - (SD)Municipal	464	Not reported	Not reported
59	City of Estelline - (SD)Municipal	430	Not reported	Not reported
60	City of Colman - (SD)Municipal	402	Not reported	Not reported
61	City of Big Stone City - (SD)Municipal	401	Not reported	Not reported
62	City of McLaughlin - (SD)Municipal	334	Not reported	Not reported
63	City of White - (SD)Municipal	309	Not reported	Not reported
64	City of Bryant - (SD)Municipal	289	Not reported	Not reported
65	City of HeclaMunicipal	283	Not reported	Not reported
66	City of Faith - (SD)Municipal	276	Not reported	Not reported
67	Town of Langford- (SD)Municipal	191	Not reported	Not reported
68	Town of Pickstown - (SD)Municipal	182	Not reported	Not reported
69	City of Badger - (SD)Municipal	83	Not reported	Not reported
70	WAPA-- Western Area Power AdministrationFederal	25	Not reported	Not reported
71	Southeast Electric Coop, IncCooperative	24	Not reported	Not reported
72	Niobrara Electric Assn, IncCooperative	16	Not reported	Not reported
73	Heartland Consumers Power DistPolitical Subdivision	3	Not reported	Not reported

Show all 73Show fewer

Small utilities that file the short form (EIA-861S) report only total sales, so their home price and bill are not reported.

Frequently asked questions

What is the biggest electric company in South Dakota?: Northern States Power Co - Minnesota had the most customers in South Dakota in 2025, about 107,985.
How do I find which utility serves my address in South Dakota?: Open your county page from the South Dakota energy overview. It lists the utilities that report serving each county. Your power bill also names your utility.

Source: U.S. Energy Information Administration, Form EIA-861 (2025) · Data for 2025

Data sources

Form EIA-861 Annual Electric Power Industry ReportU.S. Energy Information Administration

Data for 2025

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