Updated May 2026 · U.S. Energy Information Administration
What a kilowatt-hour
costs, state by state.
The average U.S. residential electricity rate is 18.44 cents per kilowatt-hour as of May 2026, up 6.2% from 17.37¢ a year earlier. Hawaii is the most expensive at 52.00¢ and Idaho the cheapest at 12.35¢.
Residential electricity rates by state, May 2026
45 of 51 jurisdictions got more expensive this year
The year to May 2026 was not a uniform increase. It was a regional one. Six of the ten largest jumps happened inside PJM, the wholesale market covering the mid-Atlantic and parts of the Midwest, where a record capacity auction repriced the cost of keeping generation available and flowed straight into default-service rates. Illinois, the District of Columbia, Maryland, Ohio, New Jersey and Pennsylvania all show it.
Hawaii moved for an entirely different reason. It burns imported oil to generate electricity, so its rate tracks world oil markets more directly than any other state's. And a small group fell: Connecticut, where a public benefits charge that spiked in 2024 unwound; New Mexico, where cheap solar replaced retiring coal under a securitisation framework; and Arizona, helped by nuclear output and new solar.
The spread itself is the headline. Hawaii charges roughly 4.2× what Idaho charges for the same kilowatt-hour. Almost none of that gap is the cost of making electricity. It is fuel logistics, network geography, regulatory structure and who pays for the grid.
Change measured May 2025 to May 2026. Source: U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A: Average Price of Electricity to Ultimate Customers by End-Use Sector, by State.
Every state, most expensive first
Residential sector average revenue per kilowatt-hour, May 2026. Source: U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A: Average Price of Electricity to Ultimate Customers by End-Use Sector, by State, Form Form EIA-861M. How we compile this.
Estimate a monthly bill
Multiply your own usage by the May 2026 state average. Enter the kilowatt-hours from your last statement. This is a supply-and-delivery blended average, not a utility quote.
Rate used: …. U.S. average 18.44¢/kWh, May 2026. Source: U.S. Energy Information Administration, Electric Power Monthly Table 5.6.A.
Frequently asked questions
Which state has the cheapest electricity?
Idaho has the lowest average residential electricity rate in the United States at 12.35¢ per kilowatt-hour as of May 2026. Utah (12.96¢) and Oklahoma (13.38¢) follow.
Which state has the most expensive electricity?
Hawaii, at 52.00¢ per kilowatt-hour, roughly 4× the cheapest state. California (33.25¢) is second.
What is the average electricity rate in the United States?
18.44 cents per kilowatt-hour for residential customers in May 2026, according to the U.S. Energy Information Administration. 19 of the 51 jurisdictions tracked here charge more than that average.
Why did electricity rates go up this year?
45 jurisdictions rose year over year and 6 fell. The largest single driver in the eastern half of the country was the PJM capacity market, which cleared at record prices and pushed default-service rates up across Illinois, Ohio, New Jersey, Maryland, Pennsylvania and the District of Columbia. Hawaii's increase tracks oil prices, and the states that fell, such as Connecticut and New Mexico, did so because a specific charge or stranded cost rolled off.
Are these rates what I will actually pay?
No. These are statewide averages of total residential revenue divided by kilowatt-hours sold, which blends supply, delivery, riders and fixed charges across every household in the state. Your own rate depends on your utility, your rate schedule and your usage. Use the figures for comparison, not as a quote.