Charging a 2027 Rivian R1S Performance (20in) at home in Wyoming

In Wyoming, home electricity runs 13.88¢/kWh — put a 2027 Rivian R1S Performance (20in)'s EPA-rated 47 kWh/100mi against that and 100 miles costs $6.52, versus $16.02 for a gas car averaging 25.5 mpg. That works out to 59.3% cheaper per mile than gasoline in Wyoming — charging at home is much cheaper than gas here.

Annual cost, at 15 thousands miles a year

Wyoming owners putting 15,000 annual miles on a 2027 Rivian R1S Performance (20in) spend about $978 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,425 saved annually, at this mileage.

Cost of a full charge

At Wyoming's rate, fully covering this 2027 Rivian R1S Performance (20in)'s 348-mile EPA range costs about $22.7 (163.5 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 Performance (20in) in Wyoming ranks 11,547 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Performance (20in) ranks 369 of 400 EV models for raw efficiency, and Wyoming ranks 12 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 Wyoming electrician to quote the install before this math becomes a real decision.

More on how this number was built

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. Wyoming's 13.88¢/kWh rate ranks 12 of 51 states; the state rate guide lays out the full spread.