Charging a 2027 Rivian R1S Quad (22in UHP) at home in South Carolina

At South Carolina's residential electricity rate of 16.04¢/kWh, a 2027 Rivian R1S Quad (22in UHP) (rated 47.3 kWh per 100 miles by the EPA) costs $7.59 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 52.6% cheaper per mile than gasoline in South Carolina — charging at home is much cheaper than gas here.

What a year of driving costs

South Carolina owners putting 15,000 annual miles on a 2027 Rivian R1S Quad (22in UHP) spend about $1,139 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,264 saved annually, at this mileage.

Cost of a full charge

At South Carolina's rate, fully covering this 2027 Rivian R1S Quad (22in UHP)'s 338-mile EPA range costs about $25.67 (160 kWh) — the energy the EPA test actually used, not the battery's rated size.

How this compares nationally

Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Quad (22in UHP) in South Carolina ranks 14,358 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Quad (22in UHP) ranks 371 of 400 EV models for raw efficiency, and South Carolina ranks 27 of 51 for cheapest residential electricity.

Before you install a home charger in South Carolina

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.

Line up a few South Carolina electrician quotes for Level 2 install before you commit either way.

More on how this number was built

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. South Carolina's 16.04¢/kWh rate ranks 27 of 51 states; the state rate guide lays out the full spread.