2026 Rivian R1T Dual Large Plus (20in): home charging cost in Idaho

A 2026 Rivian R1T Dual Large Plus (20in) draws 43.1 kWh per 100 miles per the EPA; at Idaho's 12.8¢/kWh residential rate that's $5.52 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: 65.5% 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 2026 Rivian R1T Dual Large Plus (20in) charged at home in Idaho costs about $828/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,575 a year.

Cost of a full charge

A 2026 Rivian R1T Dual Large Plus (20in) needs roughly 136.7 kWh to reach its EPA-rated 317-mile range, which runs about $17.5 at 12.8¢/kWh in Idaho.

Where this ranks

This combination ranks 7,111 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1T Dual Large Plus (20in) alone ranks 329 of 400 models for efficiency; Idaho alone ranks 3 of 51 states for electricity price.

Getting set up to charge a 2026 Rivian R1T Dual Large Plus (20in) at home

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.