2027 Rivian R1S Performance (20in): home charging cost in Idaho

At Idaho's residential electricity rate of 12.8¢/kWh, a 2027 Rivian R1S Performance (20in) (rated 47 kWh per 100 miles by the EPA) costs $6.01 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: 62.5% 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 2027 Rivian R1S Performance (20in) charged at home in Idaho costs about $902/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,501 a year.

What one full charge costs

A 2027 Rivian R1S Performance (20in) needs roughly 163.5 kWh to reach its EPA-rated 348-mile range, which runs about $20.93 at 12.8¢/kWh in Idaho.

How this compares nationally

This combination ranks 9,458 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Performance (20in) alone ranks 369 of 400 models for efficiency; Idaho alone ranks 3 of 51 states for electricity price.

Next step: home charger installation

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

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. 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.