Idaho home charging cost for the 2026 Rivian R1S Performance Dual Large Plus (20in)

At Idaho's residential electricity rate of 12.8¢/kWh, a 2026 Rivian R1S Performance Dual Large Plus (20in) (rated 43.1 kWh per 100 miles by the EPA) costs $5.52 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 costs a fraction of what gas would here: 65.5% less than gas per mile, here specifically.

Annual cost, at 15 thousands miles a year

At fueleconomy.gov's default of 15,000 annual miles, the 2026 Rivian R1S Performance Dual Large Plus (20in) costs roughly $828 a year to charge at home in Idaho, against roughly $2,403 a year for an equivalent gas car. That's a savings of about $1,575 a year.

Filling up the 2026 Rivian R1S Performance Dual Large Plus (20in), in dollars

Covering the 2026 Rivian R1S Performance Dual Large Plus (20in)'s EPA-rated 317-mile range takes about 136.7 kWh, which costs about $17.5 at Idaho's residential rate — figured from the EPA's own combined range and consumption numbers, not the pack's nameplate capacity.

2026 Rivian R1S Performance Dual Large Plus (20in) in Idaho, ranked

This combination ranks 7,108 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Performance Dual Large Plus (20in) alone ranks 328 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.