Idaho home charging cost for the 2026 Rolls-Royce Spectre Black Badge (22 inch Wheels)

At Idaho's residential electricity rate of 12.8¢/kWh, a 2026 Rolls-Royce Spectre Black Badge (22 inch Wheels) (rated 45.4 kWh per 100 miles by the EPA) costs $5.81 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: 63.7% less than gas per mile, here specifically.

Annual cost, at 15 thousands miles a year

At fueleconomy.gov's default of 15,000 annual miles, the 2026 Rolls-Royce Spectre Black Badge (22 inch Wheels) costs roughly $872 a year to charge at home in Idaho, against roughly $2,403 a year for an equivalent gas car. That's a savings of about $1,531 a year.

Filling up the 2026 Rolls-Royce Spectre Black Badge (22 inch Wheels), in dollars

Covering the 2026 Rolls-Royce Spectre Black Badge (22 inch Wheels)'s EPA-rated 266-mile range takes about 120.8 kWh, which costs about $15.47 at Idaho'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 8,521 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rolls-Royce Spectre Black Badge (22 inch Wheels) alone ranks 361 of 400 models for efficiency; Idaho alone ranks 3 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.

Ask a licensed Idaho 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. Idaho is one of the cheapest states for home electricity — the guide to why the cost varies so much by state covers what drives that.