Mississippi home charging cost for the 2026 Rivian R1S Quad Max (20in AT)

A 2026 Rivian R1S Quad Max (20in AT) draws 50.1 kWh per 100 miles per the EPA; at Mississippi's 15.35¢/kWh residential rate that's $7.69 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. Charging at home is much cheaper than gas here: 52% less than gas per mile, here specifically.

What a year of driving costs

At fueleconomy.gov's default of 15,000 annual miles, the 2026 Rivian R1S Quad Max (20in AT) costs roughly $1,154 a year to charge at home in Mississippi, against roughly $2,403 a year for an equivalent gas car. That's a savings of about $1,249 a year.

What one full charge costs

Covering the 2026 Rivian R1S Quad Max (20in AT)'s EPA-rated 325-mile range takes about 162.8 kWh, which costs about $24.99 at Mississippi's residential rate — figured from the EPA's own combined range and consumption numbers, not the pack's nameplate capacity.

Where this ranks

This combination ranks 14,550 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Quad Max (20in AT) alone ranks 392 of 400 models for efficiency; Mississippi alone ranks 22 of 51 states for electricity price.

Next step: home charger installation

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.

Get quotes from local electricians for Level 2 charger installation in Mississippi before deciding.

Where these figures come from

See the methodology guide for exactly which EIA and EPA figures feed 2026 Rivian R1S Quad Max (20in AT)'s cost in Mississippi. Curious how Mississippi's 15.35¢/kWh compares? The guide to charging cost by state ranks every state side by side.