ForgeAsset / Utilities / Central Maine Power

Central Maine Power LGS-S-TOU — EV fast-charging electricity cost

Central Maine Power LGS-S-TOU is the filed rate schedule ForgeAsset models for DC fast-charging sites in Central Maine Power territory in Maine. Energy prices at 11.3¢/kWh flat; the demand side bills $34.70/kW of monthly peak. For one reference Supercharger site held constant across the whole library, that works out to 85.5¢/kWh per dispensed kWh — rank 82 of 86 filed tariffs (1 = least expensive).

Modeled rates

Central Maine Power's large general service time-of-use rate for secondary-voltage sites whose on-peak demand exceeds 1,000 kilowatts — the class a Supercharger-scale site in the Portland, Augusta, or Lewiston corridors measures into. No fixed supply price is filed at this size: Maine's large-class standard offer restates its energy price every month from forward market prices and bills a monthly capacity charge on each customer's ISO-NE coincident-peak contribution, so the energy figure folds the trailing twelve-month average of the published monthly prices — filed prints in that window ranged from about 6 to 18 cents per kilowatt-hour — and a site's actual supply cost follows the market or a competitive supply contract rather than this average. The demand figure folds the seasonal on-peak and off-peak delivery charges, month-weighted across the filed seasons, with the capacity charge, under Maine's 5.5% sales tax on the whole commercial bill; there is no ratchet. The filed $9,952 monthly service charge is not modeled. CMP's optional EV fast-charger delivery rate was cancelled in 2023, and the pending one-year rate case re-derives this row at its final order.

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. Maine's large-class standard offer restates Central Maine Power supply prices every month from forward market prices and bills a monthly capacity charge on each customer's ISO-NE coincident-peak contribution; the modeled average spans August 2025 through July 2026, a window whose published monthly prices ranged from about 6 to 18 cents per kilowatt-hour. The filed $9,952 monthly service charge is not modeled, and CMP's optional EV fast-charger delivery rate was cancelled in 2023.

Source: Central Maine Power 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 82 of 86.

The rest of the Maine picture

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

Central Maine Power LGS-S-TOU — questions

What does Central Maine Power charge for energy on LGS-S-TOU?

The modeled rates are 11.3¢/kWh flat. At the model's default time-of-use mix (30% peak, 45% off-peak, 25% super-off-peak) that blends to 11.3¢/kWh.

Does LGS-S-TOU carry a demand charge?

Yes: $34.70/kW of monthly peak. For a reference 8-stall site at 150 kW per stall that comes to about $41,634 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 85.5¢/kWh per dispensed kWh, rank 82 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.