2026 Rivian R1S Quad Max (20in AT): home charging cost in Idaho

At Idaho's residential electricity rate of 12.8¢/kWh, a 2026 Rivian R1S Quad Max (20in AT) (rated 50.1 kWh per 100 miles by the EPA) costs $6.41 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. Charging at home is much cheaper than gas here: 60% less than gas per mile, here specifically.

Annual cost, at 15 thousands miles a year

Driving 15,000 miles a year — fueleconomy.gov's own default assumption — a 2026 Rivian R1S Quad Max (20in AT) charged at home in Idaho costs about $962/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,441 a year.

Filling up the 2026 Rivian R1S Quad Max (20in AT), in dollars

A 2026 Rivian R1S Quad Max (20in AT) needs roughly 162.8 kWh to reach its EPA-rated 325-mile range, which runs about $20.84 at 12.8¢/kWh in Idaho.

Where this ranks

This combination ranks 11,116 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Quad Max (20in AT) alone ranks 392 of 400 models for efficiency; Idaho alone ranks 3 of 51 states for electricity price.

Before you install a home charger in Idaho

The numbers above assume Level 2 home charging is already in place — the electrical work behind that is a real, separate cost that varies by panel, wiring, and local labor rates, not something this page's per-mile math includes.

Ask a licensed Idaho electrician to quote the install before this math becomes a real decision.

Where these figures come from

See the methodology guide for exactly which EIA and EPA figures feed 2026 Rivian R1S Quad Max (20in AT)'s cost in Idaho. 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.