Charging a 2027 Rivian R1S Premium Long Range (22in) at home in Washington
At Washington's residential electricity rate of 14.35¢/kWh, a 2027 Rivian R1S Premium Long Range (22in) (rated 39.9 kWh per 100 miles by the EPA) costs $5.73 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 64.2% cheaper per mile than gasoline in Washington — charging at home is much cheaper than gas here.
Annual cost, at 15 thousands miles a year
Washington owners putting 15,000 annual miles on a 2027 Rivian R1S Premium Long Range (22in) spend about $860 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,543 saved annually, at this mileage.
What one full charge costs
At Washington's rate, fully covering this 2027 Rivian R1S Premium Long Range (22in)'s 410-mile EPA range costs about $23.5 (163.7 kWh) — the energy the EPA test actually used, not the battery's rated size.
Where this ranks
Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Premium Long Range (22in) in Washington ranks 8,181 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Premium Long Range (22in) ranks 264 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
See the methodology guide for exactly which EIA and EPA figures feed 2027 Rivian R1S Premium Long Range (22in)'s cost in Washington. At 14.35¢/kWh, Washington sits in the middle of the national range — the guide to why charging cost varies by state shows where.