What it costs to charge a 2026 Rivian R1S Performance Dual Large (20in) in Mississippi

In Mississippi, home electricity runs 15.35¢/kWh — put a 2026 Rivian R1S Performance Dual Large (20in)'s EPA-rated 42.9 kWh/100mi against that and 100 miles costs $6.58, versus $16.02 for a gas car averaging 25.5 mpg. That works out to 58.9% cheaper per mile than gasoline in Mississippi — charging at home is much cheaper than gas here.

Annual cost, at 15 thousands miles a year

Home charging this 2026 Rivian R1S Performance Dual Large (20in) in Mississippi runs about $987 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,416 saved annually, at this mileage.

What one full charge costs

$19.74 — that's what Mississippi's 15.35¢/kWh rate puts on the 128.6 kWh a 2026 Rivian R1S Performance Dual Large (20in) needs for its full 300-mile EPA range.

Where this ranks

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S Performance Dual Large (20in) in Mississippi ranks 11,757 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Performance Dual Large (20in) ranks 317 of 400 EV models for raw efficiency, and Mississippi ranks 22 of 51 for cheapest residential electricity.

Before you install a home charger in Mississippi

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 Mississippi 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 2026 Rivian R1S Performance Dual Large (20in)'s cost in Mississippi. Mississippi's 15.35¢/kWh rate ranks 22 of 51 states; the state rate guide lays out the full spread.