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National Grid (New York — Niagara Mohawk) SC-3 — EV fast-charging electricity cost

National Grid NY SC-3 is the filed rate schedule ForgeAsset models for DC fast-charging sites in National Grid territory in New York. Energy prices at 9.5¢/kWh flat; the demand side bills $26.78/kW of monthly peak. For one reference Supercharger site held constant across the whole library, that works out to 66.9¢/kWh per dispensed kWh — rank 74 of 86 filed tariffs (1 = least expensive).

Modeled rates

National Grid's upstate New York large general service rate for sites above 100 kilowatts, covering the Albany Capital District and most upstate Supercharger metros. At 250 kilowatts New York places the site on mandatory hourly pricing: supply energy bills at NYISO day-ahead zonal prices with no filed fixed rate, and the energy figure folds the trailing twelve-month average of the Capital Zone's monthly day-ahead prices with the delivery riders, tariff loss factors, the state utility-revenue tax surcharge, and the 8% Albany County sales tax that New York levies on the full commercial bill. Monthly zone averages in the window ranged from about 4 to 19 cents per kilowatt-hour — a site's actual supply cost follows the market or a competitive supply contract rather than this average. The demand figure folds the flat delivery charge, its per-kilowatt riders, and the supply-side capacity charges billed on the NYISO capacity tag; the fifty-percent trailing ratchet stays inert at charging-site load shapes. National Grid's EV Phase-In Rate assigns reduced demand charges by annual load factor, a structure this model does not express. A 5.6% delivery step takes effect September 1, 2026 under the approved rate plan.

No fixed supply price is filed for this customer class — the utility bills supply at market prices that change monthly. The modeled energy figure folds the trailing twelve-month average of the filed monthly prices, an estimate rather than a filed rate; a site's actual supply cost follows the market or a competitive supply contract, and the wizard's energy-rate fields accept a contracted rate in place of the average. New York places National Grid upstate sites of this size on mandatory hourly pricing: SC-3 supply bills at NYISO day-ahead zonal prices, and the modeled average spans July 2025 through June 2026 in the Capital Zone, a window whose monthly averages ranged from about 4 to 19 cents per kilowatt-hour. National Grid's EV Phase-In Rate assigns reduced demand charges by annual load factor, a structure this model does not express.

Source: National Grid (New York — Niagara Mohawk) 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 74 of 86.

The rest of the New York picture

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

National Grid (New York — Niagara Mohawk) SC-3 — questions

What does National Grid (New York — Niagara Mohawk) charge for energy on SC-3?

The modeled rates are 9.5¢/kWh flat. At the model's default time-of-use mix (30% peak, 45% off-peak, 25% super-off-peak) that blends to 9.5¢/kWh.

Does SC-3 carry a demand charge?

Yes: $26.78/kW of monthly peak. For a reference 8-stall site at 150 kW per stall that comes to about $32,140 per month.

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 66.9¢/kWh per dispensed kWh, rank 74 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.