Idaho Power rates, bills and the 2026 increase

Flat in 2025, higher in 2026

The annual and the monthly EIA figures for Idaho Power tell two different stories, so the period matters when answering "Idaho Power rates per kWh". For calendar 2025, the 540,032 homes on its lines paid an average of 11.78¢ per kWh, against 11.76¢ per kWh in 2024: a change of +0.2%. Their average bill fell from $107.68 to $105.89 (−1.7%), because use per home slipped from 916 kWh³ to 899 kWh¹ a month.

EIA's monthly sample, which runs to August 2026, shows the step up. Over the 12 months September 2025 to August 2026 the residential average was 13.01¢ per kWh, and the average bill $114.38 for 879 kWh a month: a higher bill on lower use than in 2025. August 2026⁴ alone came in at 13.57¢ per kWh, +13.9%² against August 2025. Months from January 2026 are preliminary, and the 12-month window still includes four months of 2025 at the old rates.

All of these are average prices: residential revenue divided by residential kWh. The monthly service charge, the energy charges and the power cost adjustment are spread over every kWh, and most taxes are left out. No line in the tariff equals them, and a home that uses little electricity pays more per kWh than the average.

Idaho PowerIdaho average, all providers

Source: EIA-861M monthly sales and revenue by utility; EIA, Electric Power Monthly / EIA-861M sales and revenue by state. Residential revenue divided by kWh in each month, as reported to EIA's monthly survey (EIA-861M; months since January 2026 preliminary).

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Month	Idaho Power (¢/kWh)	kWh per customer	Bill per customer
January 2025	10.94¢	1,199	$131.18
February 2025	11.05¢	1,018	$112.46
March 2025	11.67¢	855	$99.74
April 2025	11.95¢	692	$82.73
May 2025	11.56¢	729	$84.27
June 2025	11.75¢	872	$102.43
July 2025	12.09¢	1,113	$134.65
August 2025	11.91¢	1,023	$121.84
September 2025	12.22¢	777	$94.92
October 2025	11.86¢	714	$84.73
November 2025	12.40¢	804	$99.64
December 2025	12.27¢	996	$122.23
January 2026	12.49¢	1,116	$139.36
February 2026	13.37¢	858	$114.70
March 2026	13.64¢	777	$106.01
April 2026	12.83¢	705	$90.53
May 2026	11.98¢	731	$87.55
June 2026	14.86¢	808	$120.07
July 2026	13.98¢	1,184	$165.50
August 2026	13.57¢	1,078	$146.24

Two commission decisions behind the 2026 figures

Idaho Power's rates are set by the Idaho Public Utilities Commission. On December 30, 2025, the commission approved a settlement in the company's general rate case for a smaller revenue increase than Idaho Power had requested, with new rates from January 1, 2026 and the residential monthly service charge left unchanged, according to the commission's news release. Idaho Power said the increase pays for power lines, substations and other infrastructure, and for wildfire resilience work.

A second change followed on June 1, 2026. Idaho Power's Power Cost Adjustment passes most of the difference between its actual and its base power supply costs through to customers each year, as a surcharge when costs run above the base and as a credit when they run below. For June 2026 to May 2027 the commission approved a higher adjustment, which the company attributed mainly to a lower forecast of hydroelectric generation than the year before.

Streamflow matters in Idaho more than in most states: hydropower produced 43.6% of the electricity generated in the state in 2025, the 4th highest share among the states, down from 55.9% in 2015, while natural gas rose to 31.4%⁵. A dry year means more power bought or generated from other sources, and through the adjustment those costs reach bills. The guide to rate increases explains how rate cases and cost adjustments differ.

Natural gasCoalNuclearHydroWindSolarPetroleumOther

Idaho, 2025

Idaho, 2015

United States, 2025

Source: EIA, Net generation by state by type of producer by energy source. Share of net generation by all power plants located in the state (utilities and independent producers), by energy source. Electricity crosses state lines, so this is what the state produces, not exactly what its customers consume. Pumped storage is a net user of power and is left out.

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	Natural gas	Coal	Nuclear	Hydro	Wind	Solar	Petroleum	Other
Idaho, 2025	31.4%	0.0%	0.0%	43.6%	13.9%	8.0%	0.0%	3.0%
Idaho, 2015	24.3%	0.5%	0.0%	55.9%	14.5%	0.0%	0.0%	4.8%
United States, 2025	40.9%	16.6%	17.7%	5.5%	10.4%	6.8%	0.4%	1.7%

July bills, April bills

Idaho Power's homes use the most electricity in summer. Over September 2025 to August 2026, average use ran from 705 kWh in April 2026 to 1,184 kWh in July 2026, and the average bills in those two months were $90.53 and $165.50. Avista, the state's other large utility, peaks the other way: its homes used the most in January 2026 (1,217 kWh) and the least in June 2026². A household moving between the two territories would see its high bill in a different season.

777Sep

714Oct

804Nov

996Dec

1,116Jan

858Feb

777Mar

705Apr

731May

808Jun

1,184Jul

1,078Aug

Source: EIA-861M monthly sales and revenue by utility. kWh per residential customer in each month (EIA-861M; months since January 2026 preliminary). The table adds the average bill and price for the month.

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Month	kWh per customer	Bill per customer	¢/kWh
September 2025	777	$94.92	12.22¢
October 2025	714	$84.73	11.86¢
November 2025	804	$99.64	12.40¢
December 2025	996	$122.23	12.27¢
January 2026	1,116	$139.36	12.49¢
February 2026	858	$114.70	13.37¢
March 2026	777	$106.01	13.64¢
April 2026	705	$90.53	12.83¢
May 2026	731	$87.55	11.98¢
June 2026	808	$120.07	14.86¢
July 2026	1,184	$165.50	13.98¢
August 2026	1,078	$146.24	13.57¢

Low nationally, mid-pack in Idaho

Of the 177 US utilities with 100,000 or more residential customers that report a full-service price, Idaho Power ranked 12th lowest of 177 in 2025. The median among them was 15.07¢ per kWh, and Idaho Power's average was 33.7% below the national average for investor-owned utilities. Avista's Idaho customers ranked right beside it, 13th lowest of 177 at 11.84¢ per kWh¹.

Inside Idaho, where electricity is among the cheapest in the country (2nd lowest⁶ among the states in 2025), the picture is closer. Idaho Power's average was 0.4% below the Idaho average and ranked 3rd lowest of the 7 Idaho utilities with 10,000 or more residential customers. The lowest was City of Idaho Falls, a city-owned system, at 9.60¢ per kWh, and the highest PacifiCorp at 13.53¢ per kWh¹.

City of Idaho Falls (ID)9.60¢

Idaho Power (ID)11.78¢

Avista (ID)11.84¢

Kootenai Electric Cooperative (ID)13.44¢

PacifiCorp (ID)13.53¢

Source: EIA-861 annual electric power industry report, 2025 final. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.

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Utility	average residential price (bundled customers)
City of Idaho Falls (ID)	9.60¢
Idaho Power (ID)	11.78¢
Avista (ID)	11.84¢
Kootenai Electric Cooperative (ID)	13.44¢
PacifiCorp (ID)	13.53¢

None of these is a choice: Idaho has no residential retail choice, and the address decides the utility. Idaho Power's lines reach 63.4%¹ of the state's residential customers, across 24 counties of southern Idaho, from Ada and Canyon around Boise to Blaine, Cassia, Bannock and Bingham further east. In 13 of those counties no other distribution utility reports customers; in the other 11⁷, at least one other utility also reports customers, and the utilities' own maps settle who serves a street.

Idaho Power onlyIdaho Power and other utilitiesOther utilities

Source: EIA-861 2025, service territory; Census Bureau, Cartographic boundary file, counties. EIA-861 2025 service territory: 24 counties. Counts whole counties even where the utility serves only part of one; check the utility's own service-area map for an address.

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County	Other utilities reporting service
Ada County	none
Adams County	none
Bannock County	PacifiCorp
Bingham County	PacifiCorp
Blaine County	Lost River Electric Cooperative, Salmon River Electric Cooperative
Boise County	none
Camas County	none
Canyon County	none
Cassia County	City of Burley, United Electric Co-op, Raft Rural Electric Cooperative, South Side Electric, East End Mutual Electric Co Ltd, City of Albion, City of Declo
Elmore County	none
Gem County	none
Gooding County	none
Idaho County	Avista, Clearwater Power Company, Idaho County L&P Cooperative Association, Missoula Electric Cooperative
Jerome County	none
Lemhi County	Salmon River Electric Cooperative
Lincoln County	none
Minidoka County	City of Burley, United Electric Co-op, City of Rupert, City of Heyburn, East End Mutual Electric Co Ltd, Riverside Electric Cooperative, Farmers Electric Company, Ltd, City of Minidoka
Oneida County	PacifiCorp, Raft Rural Electric Cooperative
Owyhee County	Raft Rural Electric Cooperative
Payette County	none
Power County	PacifiCorp, Raft Rural Electric Cooperative
Twin Falls County	none
Valley County	none
Washington County	City of Weiser

Fewer outage minutes than the state

In 2025 the average Idaho Power customer spent 171 minutes without electricity when storms and other major events are counted, fewer than the Idaho average of 322 minutes; leaving out major event days, the figure drops to 141 minutes. Each customer saw 1.03 interruptions on average (Idaho: 1.16). The utilities report these figures to EIA under IEEE 1366. Avista's Idaho figure, major events included, was 973 minutes⁹.

Idaho Power (ID)171

Avista (ID)973

Source: EIA-861 2025, reliability. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.

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Utility	outage minutes per customer (all events)
Idaho Power (ID)	171
Avista (ID)	973

Solar roofs, smart meters, little time-of-use

Rooftop solar is far more common on Idaho Power's system than on Avista's in north Idaho. EIA counted 18,684 net-metered residential installations in 2025, totalling 148.7 megawatts: 34.6 per 1,000 residential customers, close to the national 38.1; Avista's Idaho figure was 6.4¹⁰. The net metering guide explains how exported power is credited.

99.8% of Idaho Power's residential meters are advanced meters, able to record when electricity is used and not only how much. Pricing by time of day has barely followed: 1,086 homes, 0.2% of the total, were on the time-of-use option in 2025, while nationally 11.3%¹⁰ of homes were on some time-varying rate. Our time-of-use guide works through when such a plan lowers a bill and when it raises it.

Business customers

Businesses paid less per kWh than homes in 2025: 9.09¢ per kWh on average for 76,641 commercial accounts and 7.98¢ per kWh for 20,276 industrial accounts. Counting every one of its 636,949 customers, Idaho Power's average was 9.71¢ per kWh. A commercial account's bill averaged $418.00¹ a month; the statewide commercial average was $435.54¹¹. The Idaho page covers every utility in the state, its generation and its bills.