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Cost to charge a 2027 Rolls-Royce Spectre in Idaho
At 13.37¢ per kilowatt-hour — Idaho's average residential price in August 2026 — a full charge costs $18.26 and a year of driving costs $677. That is 26% less than the national average of $920.
- Per mile
- 5.6¢
- Full charge
- $18.26
- Per month
- $56.42
- Per year
- $677
Assumptions: 12,000 miles a year, home Level 2 charging, and EPA combined consumption measured at the wall (so charging losses are already included). Gasoline comparison uses $3.50 a gallon at 30 MPG. Change any of these in the calculator.
Against a gasoline car in Idaho
Charging at home saves $723 a year against a 30 MPG gasoline car at $3.50 a gallon.
- Electricity
- 5.6¢/mi
- Gasoline
- 11.7¢/mi
- Per year, EV
- $677
- Per year, gas
- $1,400
Fuel only. Insurance, maintenance, tires, depreciation and any purchase incentives are outside this comparison, and they can easily be larger than the fuel difference.
How Idaho compares
Idaho has the 5th cheapest residential electricity in the country, which puts a full charge at $18.26 here against $17.38 in Nevada and $64.45 in Hawaii.
| State | Rate | Full charge | Per year |
|---|---|---|---|
| North Dakota | 13.31¢ | $18.18 | $674 |
| Utah | 13.31¢ | $18.18 | $674 |
| Idaho | 13.37¢ | $18.26 | $677 |
| Tennessee | 13.42¢ | $18.33 | $680 |
| Nebraska | 13.54¢ | $18.50 | $686 |
Similar running costs in Idaho
Charging it for less in Idaho
- An off-peak or dedicated EV rate is the single largest lever, and it costs nothing but a schedule set in the car. Utilities in high-rate states often price overnight power at a fraction of the average shown here.
- Cold weather cuts real-world efficiency substantially, sometimes by a third. Preconditioning while still plugged in draws from the wall instead of the battery.
- Public DC fast charging typically costs several times home charging. The figures on this page are home Level 2 only.
- Charging to 80% rather than 100% for daily use costs proportionally less per session and is easier on the pack.
Questions
- How much does it cost to fully charge a 2027 Rolls-Royce Spectre in Idaho?
- About $18.26, drawing roughly 136.6 kWh from the wall at 13.37¢/kWh.
- What does it cost per mile?
- About 5.6¢ per mile on electricity, against roughly 11.7¢ per mile for a 30 MPG gasoline car at $3.50 a gallon.
- How far does a 2027 Rolls-Royce Spectre go on a charge?
- EPA rates it at 324 miles of combined range.