What it costs to charge a 2027 Rivian R1S Premium Long Range (20in) in Washington

At Washington's residential electricity rate of 14.35¢/kWh, a 2027 Rivian R1S Premium Long Range (20in) (rated 42 kWh per 100 miles by the EPA) costs $6.02 to drive 100 miles on home charging, against $16.02 for the same distance in a car averaging 25.5 mpg on gasoline at $4.085/gallon. That works out to 62.4% cheaper per mile than gasoline in Washington — charging at home is much cheaper than gas here.

2027 Rivian R1S Premium Long Range (20in): yearly cost in Washington

Home charging this 2027 Rivian R1S Premium Long Range (20in) in Washington runs about $903 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,499 saved annually, at this mileage.

Cost of a full charge

$22.89 — that's what Washington's 14.35¢/kWh rate puts on the 159.5 kWh a 2027 Rivian R1S Premium Long Range (20in) needs for its full 380-mile EPA range.

Where this ranks

Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Premium Long Range (20in) in Washington ranks 9,564 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Premium Long Range (20in) ranks 296 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.

Ask a licensed Washington electrician to quote the install before this math becomes a real decision.

More on how this number was built

The methodology guide names the exact EIA and EPA tables behind this page's numbers. At 14.35¢/kWh, Washington sits in the middle of the national range — the guide to why charging cost varies by state shows where.