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The same Supercharger site, priced on 96 utility tariffs

This table holds one reference site constant — 8 Tesla V4 stalls dispensing 235 kWh per stall per day — and prices its monthly utility bill on every filed tariff in the library. The result spans a 22.4× spread from the least to the most expensive territory, from 4.7¢/kWh to 105.1¢/kWh per kWh dispensed. It reports filed rates and arithmetic; it renders no verdict.

Reference site: 8 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. Blended energy is the TOU-weighted average of each tariff's filed rates. Rates are digit-verified against each utility's own filed sheets; full derivations are on the methodology page.

Reading the spread

The cheapest and the most expensive territory in the library differ by more than the entire retail margin of many sites — before rent, hardware, or taxes enter the picture. Both columns matter: some territories bill thousands of dollars a month in demand charges for the same connected load, while others carry no demand charge at all and put the cost in the energy rate instead. The demand-charge lookup breaks that single line item out per tariff.

Utility rankings — questions

What does the effective cost per kWh include?

For each tariff it takes the reference site's monthly dispensed energy, grosses it up 12% for charging losses, prices it at the tariff's rates using the model's default time-of-use mix, adds the tariff's filed demand charge, and divides the total by the kWh actually sold. It is the all-in utility cost of each kilowatt-hour that reaches a vehicle.

Why does the same site cost so much more in some territories?

Two reasons: the filed energy rates themselves differ several-fold between utilities, and demand-charge structures differ even more — some territories bill nothing for peak demand while others bill thousands of dollars a month for the same connected load. The ranking holds the site constant so the spread is attributable to the tariff alone.

Does a cheap tariff make a site a good investment?

Electricity cost is one input among many. Utilization, retail price, rent, hardware cost, financing, taxes, and incentives all move the result, and the ranking says nothing about demand at any particular location. The full model prices a specific address across all of these; this table reports what each utility files.

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