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Idaho electricity rates

63 residential tariffs from 26 utilities. Across the 7 filed since 2020, the median costs $0.1402 per kWh at 1,000 kWh a month once fixed charges are included — the cheapest $0.0976, the most expensive $0.1906.

$0.1402median $/kWh, all in
26utilities
63tariffs on file
8%time-of-use
13%filed since 2020
Where Idaho sits — effective $/kWh at 1,000 kWh a month
  • 7 comparable tariffs: $0.0976 to $0.1906
  • Idaho median $0.1402
  • US median $0.1658

Rate structures in Idaho

  • Flat 44 (70%)
  • Tiered 12 (19%)
  • Time-of-use 5 (8%)
  • Seasonal + tiered 2 (3%)

Lowest effective rates at 1,000 kWh/month

Ranked across tariffs filed since 2020: 7 here, 13% of those on file. Older filings are excluded because they are systematically below what utilities now charge. See methodology. Effective rate includes fixed charges, and availability restrictions may apply.

UtilityTariffStructureFiled $/kWhAnnual
Idaho Power Co Schedule 5 - Residential Time-of-Day Time-of-use 2022 $0.0976 $1,171.73
PacifiCorp (Idaho) Schedule 36 - Residential Service Optional TOD Time-of-use 2024 $0.1122 $1,346.34
Idaho Power Co Schedule 5 - Residential Time-of-Day Time-of-use 2025 $0.1255 $1,506.34
Avista Corp 1 Residential Service Tiered 2026 $0.1402 $1,682.76
Idaho Power Co Schedule 1 - Residential Service Seasonal + tiered 2025 $0.1770 $2,124.17
Idaho Power Co Schedule 5 - Residential Time-of-Day Time-of-use 2025 $0.1810 $2,172.62
Idaho Power Co Schedule 3 - Master-Metered Mobile Home Flat 2025 $0.1906 $2,286.92

Not a 1,000 kWh household?

Price every Idaho tariff against the usage on your own bill.

Price these at your usage

Guides to these rates

All guides

  1. Guide · 3 min

    Your utility probably offers more than one rate

    At 104 utilities with more than one current residential tariff open to everyone, the cheapest option beat the middle one by a median $71 a year at 1,000 kWh a month — and by more than $250 at 21 of them.

  2. Guide · 3 min

    When is electricity most expensive? It depends on your utility

    Across 95 utilities with time-of-use rates we found 49 different weekday peak windows. Nearly all include 5 to 6 pm; little else is shared.

  3. Guide · 4 min

    Does each extra kWh cost more? It depends where you live

    Of 84 utilities with tiered residential rates, 43 charge more per kWh as usage rises, 23 charge less, and 11 do both: rising in summer, falling in winter.

  4. Guide · 3 min

    Does electricity cost more in summer? At about half of utilities, yes

    Of 174 utilities, 82 charge more for the same 1,000 kWh in July than in January, typically about $12 a month. 19 charge more in winter.

  5. Guide · 3 min

    What utilities charged for electricity in 2025

    Across 1,199 utilities, the average residential price rose a median 4.1% from 2024 to 2025. At 137 it rose 10% or more; at 227 it fell.