2026 Rivian R1S Dual Large (20in): home charging cost in Mississippi

At Mississippi's residential electricity rate of 15.35¢/kWh, a 2026 Rivian R1S Dual Large (20in) (rated 42.9 kWh per 100 miles by the EPA) costs $6.58 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. Charging at home is much cheaper than gas here: 58.9% less than gas per mile, here specifically.

2026 Rivian R1S Dual Large (20in): yearly cost in Mississippi

Driving 15,000 miles a year — fueleconomy.gov's own default assumption — a 2026 Rivian R1S Dual Large (20in) charged at home in Mississippi costs about $987/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,416 a year.

What one full charge costs

A 2026 Rivian R1S Dual Large (20in) needs roughly 128.6 kWh to reach its EPA-rated 300-mile range, which runs about $19.74 at 15.35¢/kWh in Mississippi.

How this compares nationally

This combination ranks 11,755 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Dual Large (20in) alone ranks 316 of 400 models for efficiency; Mississippi alone ranks 22 of 51 states for electricity price.

Getting set up to charge a 2026 Rivian R1S Dual Large (20in) at home

The numbers above assume Level 2 home charging is already in place — the electrical work behind that is a real, separate cost that varies by panel, wiring, and local labor rates, not something this page's per-mile math includes.

Ask a licensed Mississippi electrician to quote the install before this math becomes a real decision.

Where these figures come from

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. Curious how Mississippi's 15.35¢/kWh compares? The guide to charging cost by state ranks every state side by side.