What it costs to charge a 2026 Rivian R1S Tri Max (22in) in Washington

A 2026 Rivian R1S Tri Max (22in) draws 44.6 kWh per 100 miles per the EPA; at Washington's 14.35¢/kWh residential rate that's $6.4 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 60.1% cheaper per mile than gasoline in Washington — charging at home is much cheaper than gas here.

What a year of driving costs

Home charging this 2026 Rivian R1S Tri Max (22in) in Washington runs about $959 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,444 saved annually, at this mileage.

Filling up the 2026 Rivian R1S Tri Max (22in), in dollars

$23.73 — that's what Washington's 14.35¢/kWh rate puts on the 165.4 kWh a 2026 Rivian R1S Tri Max (22in) needs for its full 371-mile EPA range.

2026 Rivian R1S Tri Max (22in) in Washington, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S Tri Max (22in) in Washington ranks 11,098 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Tri Max (22in) ranks 356 of 400 EV models for raw efficiency, and Washington ranks 15 of 51 for cheapest residential electricity.

Next step: home charger installation

Everything above is the per-mile and per-year cost once a home charger exists — getting one installed is a separate electrical job whose price depends on your panel and wiring, not the state average used here.

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

More on how this number was built

The methodology guide names the exact EIA and EPA tables behind this page's numbers. Washington's 14.35¢/kWh rate ranks 15 of 51 states; the state rate guide lays out the full spread.