HomeWattCost

Rocky Mountain Power (Wyoming) rates

Rocky Mountain Power has 2 residential plans modelled here. For a typical Wyoming home using 817 kWh a month, the cheapest is Schedule 2, at about $118 a month.

Investor-owned 118,130 residential customers (EIA-861, 2024) Tariffs checked September 28, 2026

Typical all-in priceSchedule 2

01234567890123456789.0123456789¢/kWh
Schedule 2$118/mo
Schedule 19$121/mo

Residential plans

PlanTypeFixed/moJuly pricesJanuary pricesJuly weekday windows
Schedule 2
Residential Service
Flat $24.24 11.5¢ all hours 11.5¢ all hours None
Schedule 19
Residential Time of Use (pilot)
Time-of-use $26.30 Off-peak 9.2¢ · Peak 15.4¢ Off-peak 9.2¢ · Peak 15.4¢ Peak 7 am–9 am, Peak 5 pm–11 pm

Schedule 19: price by hour

July weekday. Same pricing all year.

Off-peakPeak
9.2¢15.4¢9.2¢15.4¢9.2¢12a3a6a9a12p3p6p9p12a

Charging an EV on Rocky Mountain Power

1,000 miles a month in a Tesla Model Y Long Range AWD (275 kWh from the wall, EPA 27.5 kWh/100 mi) at 7.2 kW, added to a typical Wyoming home’s use, on each plan’s cheapest start hour versus plugging in at 6 pm. Averaged over the year.

PlanBest startCharging, best startCharging from 6 pmWhole bill with EV
Schedule 2Any$32/mo$32/mo$150/mo
Schedule 1912 am$25/mo$42/mo$147/mo

With an EV charged at its best hour, the cheapest plan overall is Schedule 19. Compare plans on your own usage.

How Rocky Mountain Power’s plans work

Schedule 2 (Residential Service). One price per kWh at every hour, all year: 11.5¢. Shifting use to other hours changes nothing on this plan; using less is the only lever. Fixed charge: $24.24 a month.

Schedule 19 (Residential Time of Use (pilot)). Peak 7 am–9 am, Peak 5 pm–11 pm on July weekdays; 8 of 24 hours carry the top price of 15.4¢. The cheapest July weekday hour costs 9.2¢, so moving 1 kWh out of the top hours saves 6.2¢. January weekdays range from 9.2¢ to 15.4¢. Fixed charge: $26.30 a month.

Prices on this page are all-in per kWh, before taxes: base rates, supply and every per-kWh rider in the utility’s current tariff sheets. Your bill shows them as separate lines, and riders can change between tariff revisions.

As a cross-check, Rocky Mountain Power billed its residential customers an average of 13.44¢ per kWh in 2024 (revenue ÷ sales, EIA-861). A plan taken from URDB is shown only if its all-in price is consistent with that figure, adjusted for Wyoming’s price change since.

Sources for each plan

Plans marked “Checked” were transcribed from the utility’s current tariff and rider sheets, all charges included, and are re-checked on the date shown in each file. Other plans come from the OpenEI U.S. Utility Rate Database (CC BY 4.0) and have not yet been checked line by line against the utility’s tariff. Always confirm the current rates on your utility’s website before switching plans.

Run the numbers on Rocky Mountain Power