May 2026 EV Home Charging Cost Benchmark

Modeled charging session costs

This benchmark uses a 90% meter-to-battery efficiency assumption for simple household math. A 20 kWh battery-energy addition becomes 22.22 kWh at the meter and costs about $4.10 at 18.44 cents/kWh. A 40 kWh addition becomes 44.44 kWh and costs about $8.20. A 60 kWh addition becomes 66.67 kWh and costs about $12.29.

The formula is meter kWh = battery kWh added divided by charging efficiency. Cost then equals meter kWh multiplied by $0.1844/kWh. The result is a benchmark for the energy-use portion of a charging event, not a prediction of a full household bill.

Level 1 and Level 2 charging both happen at home for many drivers. The U.S. Department of Energy Alternative Fuels Data Center says Level 1 uses a standard 120 V outlet, while Level 2 uses 240 V equipment and can generally charge a depleted all-electric vehicle overnight.

Modeled cost per 100 miles

AFDC describes kWh per 100 miles as a common fuel-economy metric for electric vehicles and notes that light-duty all-electric vehicles can use about 25 to 40 kWh to drive 100 miles, depending on vehicle and driving conditions.

Using that range with the May 2026 residential price creates a useful driving-cost band. At 90% charging efficiency, a 25 kWh/100-mile EV draws about 27.78 kWh from the meter and costs about $5.12 per 100 miles. A 30 kWh/100-mile benchmark draws about 33.33 kWh and costs about $6.15. A 40 kWh/100-mile benchmark draws about 44.44 kWh and costs about $8.20.

Drivers should compare this national benchmark with their own utility bill or EV time-of-use plan. Off-peak charging can lower the result, while high retail prices, demand charges, or charging during peak periods can raise it.

Why the benchmark differs from a calculator result

This Insight uses one national EIA reporting-period price and a small set of scenarios so readers can understand the scale of May 2026 home charging costs. The EV Home Charging Cost Calculator remains the right tool for a household-specific result because it accepts battery size, starting charge, target charge, charging efficiency, local rate, and driving assumptions.

The article also separates the battery-energy amount from the meter-energy amount. That distinction prevents a common undercount: multiplying battery kWh directly by the retail electricity price ignores charging losses and understates the amount billed by the utility meter.

Methodology and limits

This article uses EIA's May 2026 Electricity Monthly Update, released July 23, 2026, for the national residential average revenue per kWh. It uses AFDC consumer guidance for home charging context and AFDC fuel-economy guidance for the 25 to 40 kWh/100-mile light-duty EV range.

Charging efficiency is modeled at 90% for the main scenarios. DOE FEMP purchasing guidance includes 90%, 93%, and 97% on-mode efficiency examples for EV supply equipment, so the 90% assumption is a conservative household benchmark rather than a universal charger rating.

All costs are rounded to the nearest cent at the presentation step. The analysis does not include fixed customer charges, taxes, utility riders, public charging prices, parking fees, gasoline comparisons, battery degradation, cold-weather efficiency changes, or state-specific tariffs.