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

A 2026 Rivian R1S Dual Large (20in) draws 42.9 kWh per 100 miles per the EPA; at Idaho's 12.8¢/kWh residential rate that's $5.49 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. Charging at home costs a fraction of what gas would here: 65.7% less than gas per mile, here specifically.

2026 Rivian R1S Dual Large (20in): yearly cost in Idaho

At fueleconomy.gov's default of 15,000 annual miles, the 2026 Rivian R1S Dual Large (20in) costs roughly $823 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 $1,580 a year.

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

Covering the 2026 Rivian R1S Dual Large (20in)'s EPA-rated 300-mile range takes about 128.6 kWh, which costs about $16.46 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 Dual Large (20in) in Idaho, ranked

This combination ranks 6,924 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Dual Large (20in) alone ranks 316 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.

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

Where these figures come from

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.