Charging a 2026 Rolls-Royce Spectre Black Badge (23 inch Wheels) at home in Idaho

A 2026 Rolls-Royce Spectre Black Badge (23 inch Wheels) draws 48.3 kWh per 100 miles per the EPA; at Idaho's 12.8¢/kWh residential rate that's $6.18 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 61.4% cheaper per mile than gasoline in Idaho — charging at home is much cheaper than gas here.

2026 Rolls-Royce Spectre Black Badge (23 inch Wheels): yearly cost in Idaho

Idaho owners putting 15,000 annual miles on a 2026 Rolls-Royce Spectre Black Badge (23 inch Wheels) spend about $927 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,476 saved annually, at this mileage.

What one full charge costs

At Idaho's rate, fully covering this 2026 Rolls-Royce Spectre Black Badge (23 inch Wheels)'s 251-mile EPA range costs about $15.51 (121.2 kWh) — the energy the EPA test actually used, not the battery's rated size.

2026 Rolls-Royce Spectre Black Badge (23 inch Wheels) in Idaho, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rolls-Royce Spectre Black Badge (23 inch Wheels) in Idaho ranks 10,270 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rolls-Royce Spectre Black Badge (23 inch Wheels) ranks 380 of 400 EV models for raw efficiency, and Idaho ranks 3 of 51 for cheapest residential electricity.

Next step: home charger installation

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 Idaho electrician to quote the install before this math becomes a real decision.

More on how this number was built

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.