2026 Rivian R1S All-Terrain Dual Max (20in): home charging cost in Washington

A 2026 Rivian R1S All-Terrain Dual Max (20in) draws 43.2 kWh per 100 miles per the EPA; at Washington's 14.35¢/kWh residential rate that's $6.2 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: 61.3% 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 R1S All-Terrain Dual Max (20in) charged at home in Washington costs about $930/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,473 a year.

Filling up the 2026 Rivian R1S All-Terrain Dual Max (20in), in dollars

A 2026 Rivian R1S All-Terrain Dual Max (20in) needs roughly 159.9 kWh to reach its EPA-rated 370-mile range, which runs about $22.95 at 14.35¢/kWh in Washington.

Where this ranks

This combination ranks 10,363 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S All-Terrain Dual Max (20in) alone ranks 333 of 400 models for efficiency; Washington alone ranks 15 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 Washington before deciding.

Where these figures come from

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. At 14.35¢/kWh, Washington sits in the middle of the national range — the guide to why charging cost varies by state shows where.