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National Grid (Massachusetts) EV Pricing (G-3) — EV fast-charging electricity cost

National Grid MA EV Pricing (G-3) is the filed rate schedule ForgeAsset models for DC fast-charging sites in National Grid territory in Massachusetts. Energy prices at 18.8¢/kWh–19.0¢/kWh by time of day; the demand side bills none. For one reference Supercharger site held constant across the whole library, that works out to 21.1¢/kWh per dispensed kWh — rank 14 of 86 filed tariffs (1 = least expensive).

Modeled rates

National Grid's filed EV-specific pricing on the Worcester-area large-service rate: the demand price per kilowatt is one of four filed schedules assigned from the site's load factor — from $0 below 5% up to the standard G-3 rate above 15% — with a per-kWh distribution adder on the lower schedules. The model derives the load factor from the projected energy and the billed peak, re-assigning the schedule each model year; the filed version re-assigns every June 1 from trailing billed data. The first-decade discount phase-down is not modeled. Energy figures carry the published August–October 2026 default-supply strip and fold the 6.25% Massachusetts electricity sales tax; the filed adder applies to peak-window energy and the model applies it to all energy, a conservative reading. The default-supply price resets quarterly and the library re-derives each strip.

Source: National Grid (Massachusetts) filed rate schedule. Rates are digit-verified against the utility's own filed sheets and update within two weeks of any revision; derivations are on the methodology page.

What the reference site pays here

Reference site: 8 Tesla V4 stalls at 235 kWh/stall/day (57,183 kWh dispensed per month), a 150kW per-stall demand assumption, the model's default time-of-use mix, and a 12% loss gross-up — identical to the full utility ranking, where this tariff sits at position 14 of 86.

The rest of the Massachusetts picture

The tariff is one layer. State taxes, incentives, clean-fuels programs, and the charging market shape the remainder — Tesla Supercharger ROI in Massachusetts covers them, and the US Supercharger Economics Map shows every US Supercharger over utility territories colored by this same effective-cost derivation.

National Grid (Massachusetts) EV Pricing (G-3) — questions

What does National Grid (Massachusetts) charge for energy on EV Pricing (G-3)?

The modeled rates are 18.8¢/kWh–19.0¢/kWh by time of day. At the model's default time-of-use mix (30% peak, 45% off-peak, 25% super-off-peak) that blends to 18.8¢/kWh.

Does EV Pricing (G-3) carry a demand charge?

No separable demand charge is billed under the modeled structure — the cost sits in the energy rates instead.

What does electricity cost per kWh dispensed on this tariff?

For the reference site — 8 Tesla V4 stalls dispensing 235 kWh per stall per day, with a 12% loss gross-up — the all-in utility cost works out to 21.1¢/kWh per dispensed kWh, rank 14 of 86 tariffs in the library (1 = least expensive).

ForgeAsset is software, not investment, tax, or legal advice — outputs are model estimates from your inputs, not guarantees. Rates current as of research; verify current terms with the utility's filed schedule before committing capital.