2026 Rivian R1S All-Terrain Performance Dual Large Plus (20in): home charging cost in Idaho

A 2026 Rivian R1S All-Terrain Performance Dual Large Plus (20in) draws 46.9 kWh per 100 miles per the EPA; at Idaho's 12.8¢/kWh residential rate that's $6 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. Charging at home is much cheaper than gas here: 62.5% less than gas per mile, here specifically.

What a year of driving costs

Driving 15,000 miles a year — fueleconomy.gov's own default assumption — a 2026 Rivian R1S All-Terrain Performance Dual Large Plus (20in) charged at home in Idaho costs about $900/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,503 a year.

Cost of a full charge

A 2026 Rivian R1S All-Terrain Performance Dual Large Plus (20in) needs roughly 136.9 kWh to reach its EPA-rated 292-mile range, which runs about $17.52 at 12.8¢/kWh in Idaho.

How this compares nationally

This combination ranks 9,461 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S All-Terrain Performance Dual Large Plus (20in) alone ranks 366 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.

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

Where these figures come from

See the methodology guide for exactly which EIA and EPA figures feed 2026 Rivian R1S All-Terrain Performance Dual Large Plus (20in)'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.