ForgeAsset / Utilities / Rocky Mountain Power (Utah)

Rocky Mountain Power (Utah) Schedule 8 — EV fast-charging electricity cost

Rocky Mountain Power Sch 8 is the filed rate schedule ForgeAsset models for DC fast-charging sites in Rocky Mountain Power territory in Utah. Energy prices at 3.5¢/kWh–6.9¢/kWh by time of day; the demand side bills $24.15/kW of monthly peak. For one reference Supercharger site held constant across the whole library, that works out to 55.7¢/kWh per dispensed kWh — rank 67 of 86 filed tariffs (1 = least expensive).

Modeled rates

Rocky Mountain Power's large-service rate for the Salt Lake City area: cheap time-of-use energy against a heavy demand charge — an unconditional facilities component plus a seasonal on-peak-window power charge that coincides with a charging site's peak. Figures fold the utility's adjustment stack and Salt Lake City's 8.45% electricity sales tax; the winter on-peak period spans a morning and an evening block billed as one charge on one measured maximum. A rate-case settlement pending before the commission re-bases both the level and the energy-to-demand split; these figures carry current pre-settlement rates and re-derive at the order.

The filed rate book for this territory records no EV-specific commercial rate, so the modeled cost is the standard schedule. Demand follows the model's conservative convention — 150 kW per stall billed every month, the worst-case coincident peak — so a site whose metered peak runs below that would see a lower demand line.

Source: Rocky Mountain Power (Utah) 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 67 of 86.

The rest of the Utah picture

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

Rocky Mountain Power (Utah) Schedule 8 — questions

What does Rocky Mountain Power (Utah) charge for energy on Schedule 8?

The modeled rates are 3.5¢/kWh–6.9¢/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 4.5¢/kWh.

Does Schedule 8 carry a demand charge?

Yes: $24.15/kW of monthly peak. For a reference 8-stall site at 150 kW per stall that comes to about $28,981 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 55.7¢/kWh per dispensed kWh, rank 67 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.