Charging a 2027 Rivian R1S Premium Long Range (22in) at home in Wyoming

At Wyoming's residential electricity rate of 13.88¢/kWh, a 2027 Rivian R1S Premium Long Range (22in) (rated 39.9 kWh per 100 miles by the EPA) costs $5.54 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 65.4% cheaper per mile than gasoline in Wyoming — charging at home costs a fraction of what gas would here.

Annual cost, at 15 thousands miles a year

Wyoming owners putting 15,000 annual miles on a 2027 Rivian R1S Premium Long Range (22in) spend about $832 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,571 saved annually, at this mileage.

Cost of a full charge

At Wyoming's rate, fully covering this 2027 Rivian R1S Premium Long Range (22in)'s 410-mile EPA range costs about $22.73 (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 Wyoming ranks 7,235 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 Wyoming ranks 12 of 51 for cheapest residential electricity.

Before you install a home charger in Wyoming

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

The methodology guide names the exact EIA and EPA tables behind this page's numbers. At 13.88¢/kWh, Wyoming sits in the middle of the national range — the guide to why charging cost varies by state shows where.