What it costs to charge a 2026 Rivian R1S All-Terrain Performance Dual Large (20in) in Idaho

At Idaho's residential electricity rate of 12.8¢/kWh, a 2026 Rivian R1S All-Terrain Performance Dual Large (20in) (rated 44.4 kWh per 100 miles by the EPA) costs $5.68 to drive 100 miles on home charging, against $16.02 for the same distance in a car averaging 25.5 mpg on gasoline at $4.085/gallon. That works out to 64.6% cheaper per mile than gasoline in Idaho — charging at home is much cheaper than gas here.

What a year of driving costs

Home charging this 2026 Rivian R1S All-Terrain Performance Dual Large (20in) in Idaho runs about $852 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,551 saved annually, at this mileage.

What one full charge costs

$16.41 — that's what Idaho's 12.8¢/kWh rate puts on the 128.2 kWh a 2026 Rivian R1S All-Terrain Performance Dual Large (20in) needs for its full 289-mile EPA range.

2026 Rivian R1S All-Terrain Performance Dual Large (20in) in Idaho, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S All-Terrain Performance Dual Large (20in) in Idaho ranks 7,803 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S All-Terrain Performance Dual Large (20in) ranks 345 of 400 EV models for raw efficiency, and Idaho ranks 3 of 51 for cheapest residential electricity.

Getting set up to charge a 2026 Rivian R1S All-Terrain Performance Dual Large (20in) at home

Everything above is the per-mile and per-year cost once a home charger exists — getting one installed is a separate electrical job whose price depends on your panel and wiring, not the state average used here.

Get quotes from local electricians for Level 2 charger installation in Idaho before deciding.

More on how this number was built

The methodology guide names the exact EIA and EPA tables behind this page's numbers. Idaho is one of the cheapest states for home electricity — the guide to why the cost varies so much by state covers what drives that.