Charging a 2026 Rivian R1S Performance Dual Large (22in) at home in Mississippi

In Mississippi, home electricity runs 15.35¢/kWh — put a 2026 Rivian R1S Performance Dual Large (22in)'s EPA-rated 39.5 kWh/100mi against that and 100 miles costs $6.06, versus $16.02 for a gas car averaging 25.5 mpg. That works out to 62.2% cheaper per mile than gasoline in Mississippi — charging at home is much cheaper than gas here.

What a year of driving costs

Mississippi owners putting 15,000 annual miles on a 2026 Rivian R1S Performance Dual Large (22in) spend about $909 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,494 saved annually, at this mileage.

Filling up the 2026 Rivian R1S Performance Dual Large (22in), in dollars

At Mississippi's rate, fully covering this 2026 Rivian R1S Performance Dual Large (22in)'s 329-mile EPA range costs about $19.93 (129.9 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 2026 Rivian R1S Performance Dual Large (22in) in Mississippi ranks 9,682 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Performance Dual Large (22in) ranks 251 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 (22in)'s cost in Mississippi. Mississippi's 15.35¢/kWh rate ranks 22 of 51 states; the state rate guide lays out the full spread.