Idaho Electricity Prices

Relatively, yes — 12.35¢ per kilowatt-hour in May 2026, 1st-cheapest of 51 and 36.4% below the national benchmark.

At Idaho's May 2026 average of 12.35¢/kWh, 10,500 kWh of annual use works out to $1,297 a year — around $108 a month. Running the same 10,500 kWh calculation at the May 2026 national benchmark rate gives $2,038 — a $741 gap between the two published averages, less for Idaho, not a bill either way.

Over the full EIA series the Idaho jurisdiction average has risen 137% since January 2001, from 5.21¢ to 12.35¢ in May 2026 — a compound 3.5% per year. Month-to-month movement has been about typical for a reporting jurisdiction.

March 2026, at 13.01¢ per kilowatt-hour. The May 2026 reading of 12.35¢ sits 5.1% below that peak. The lowest monthly average on record was 5.21¢ in January 2001.

July. Measured over the 25 complete calendar years the EIA series covers for Idaho, 2001 through 2025, July runs highest relative to its own year and February runs lowest — a swing of roughly 11.6 percentage points.

Among Idaho and its land-border neighbours in May 2026, Idaho posts the lowest average at 12.35¢ and Oregon the highest at 16.27¢. That makes Idaho the cheapest in the group, at 12.35¢.

Almost certainly not exactly, and this is the one caveat that governs every figure on this page. The published value is the EIA residential average across every utility and residential rate class in Idaho for May 2026 — a benchmark, never a billed amount. Even the jurisdiction figure is not one number — across the trailing year it moved between 11.87¢ in December 2025 and 13.01¢ in March 2026. Your own rate depends on your utility, tariff, usage tier, time-of-use schedule, and fixed monthly charges, none of which this index models. Read your bill for the rate that applies to you.