Why State Electricity Rates Vary by 3x: Reading the EIA State Electricity Profiles

The U.S. Energy Information Administration's State Electricity Profile reports residential retail electricity rates across all 50 states. The spread is striking: low-cost states like Washington, Idaho, Louisiana, and Wyoming sit near or below 12 cents per kilowatt-hour, while Hawaii consistently exceeds 35 cents and the California, Massachusetts, Rhode Island, and Connecticut markets sit in the high 20s and low 30s. The factor of three difference between cheapest and most expensive states reflects four structural drivers worth unpacking.

The first driver is generation mix. States with substantial hydroelectric capacity (Washington, Oregon, Idaho) have access to electricity at production costs measured in cents per kilowatt-hour, because hydroelectric plants once built have minimal variable cost. States with substantial nuclear baseload (Illinois, Pennsylvania, South Carolina) also have low variable cost generation. States that rely heavily on imported natural gas or expensive oil for electricity (New England, Hawaii) carry the variable cost of fuel into their retail rates.

The second driver is fuel source. Natural-gas-fired electricity is the marginal source in most U.S. markets, meaning when demand rises, gas plants ramp up to meet it. Gas prices set the wholesale electricity price most hours of the year in most regions. States with cheap, locally-produced natural gas (Texas, Louisiana, Oklahoma) translate that into low electricity rates. States that import natural gas via constrained pipelines (New England) pay a meaningful premium on the gas commodity and that premium flows through to retail electricity rates.

The third driver is transmission and distribution cost. The wires that move electricity from generation plants to homes carry a fixed cost that gets allocated across all customers. Densely-populated states with concentrated load (New Jersey, Connecticut) can have moderate generation cost but high T&D overhead because of the cost of maintaining urban distribution networks. Lightly-populated states with long transmission distances (Wyoming, Montana) can have low generation cost but elevated T&D cost per kilowatt-hour delivered. The EIA reports the split between energy charge and delivery charge on average, but the per-utility split varies substantially.

The fourth driver is regulatory and program cost. Some states layer renewable portfolio standards, energy-efficiency programs, low-income subsidies, and other regulatory programs onto retail rates. California, New York, and Massachusetts all have substantial above-the-energy-cost adders for various public-policy programs. Texas, Florida, and most southern states have much smaller regulatory adders. The same kilowatt-hour delivered to a residential customer carries materially different policy overhead in different states.

Hawaii is the extreme case and worth a special look. Hawaii's electricity rates are roughly double the U.S. average because Hawaii's electricity is generated almost entirely from imported oil — there is no natural-gas pipeline to Hawaii, no coal mines, no nuclear plants, and limited hydroelectric capacity. Oil-fired electricity in Hawaii costs 20 to 30 cents per kilowatt-hour in fuel alone, before any T&D or program costs. Hawaii is rapidly building solar plus storage to reduce oil dependence, but the transition runs over decades.

Three caveats when comparing state rates. First, the EIA average rate is a weighted average across all residential customers; an individual household's rate can be higher or lower based on which utility serves them. Second, time-of-use rates and tiered rates mean the average rate hides substantial within-state variation. Third, electricity rates exclude the cost of electrification (driving the EV instead of buying gasoline, running the heat pump instead of burning natural gas), so total household energy costs are not just electricity rates.

For anyone reading EIA State Electricity Profile data, the headline residential rate is a useful starting point but reveals only part of the story. The generation mix, the fuel cost, the T&D cost, and the regulatory overhead all matter, and the EIA publishes the underlying data for each. Putting them together produces a much richer picture than the average rate alone.

Source: U.S. Energy Information Administration, 2026.