HomeWattCost

Salt River Project rates

SRP has 2 residential plans modelled here. For a typical Arizona home using 1,052 kWh a month, the cheapest is E-28, at about $155 a month.

Public power 1,053,407 residential customers (EIA-861, 2024) Tariffs checked September 28, 2026

Typical all-in priceE-28

01234567890123456789.0123456789¢/kWh
E-23$156/mo
E-28$155/mo

SRP sets its monthly service charge by service size; the plans shown use Tier 2 ($30), the size of a typical single-family house (up to 225 A). E-21, E-26 and E-29 closed to new customers in November 2025.

Residential plans

PlanTypeFixed/moJuly pricesJanuary pricesJuly weekday windows
E-23
Basic Price Plan
Flat $30.00 13.6¢ all hours 11.0¢ all hours None
E-28
Conserve 6-9 p.m. and Save
Time-of-useEV $30.00 Off-peak 6.2¢ · Mid-peak 12.4¢ · Peak 39.8¢ Off-peak 4.3¢ · Mid-peak 13.6¢ · Peak 15.1¢ Mid-peak 12 am–8 am, Mid-peak 3 pm–6 pm, Peak 6 pm–9 pm, Mid-peak 9 pm–12 am

E-28: price by hour

July weekday. Summer pricing Jul–Aug; winter Nov–Apr.

Off-peakMid-peakPeak
12.4¢6.2¢12.4¢39.8¢12.4¢12a3a6a9a12p3p6p9p12a

Charging an EV on SRP

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 Arizona 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
E-23Any$32/mo$32/mo$188/mo
E-288 am$12/mo$51/mo$168/mo

With an EV charged at its best hour, the cheapest plan overall is E-28. Compare plans on your own usage.

How SRP’s plans work

E-23 (Basic Price Plan). One price per kWh at every hour: 13.6¢ in July and 11.0¢ in January. Shifting use to other hours changes nothing on this plan; using less is the only lever. Fixed charge: $30.00 a month.

E-28 (Conserve 6-9 p.m. and Save). Mid-peak 12 am–8 am, Mid-peak 3 pm–6 pm, Peak 6 pm–9 pm, Mid-peak 9 pm–12 am on July weekdays; 3 of 24 hours carry the top price of 39.8¢. The cheapest July weekday hour costs 6.2¢, so moving 1 kWh out of the top hours saves 33.6¢. January weekdays range from 4.3¢ to 15.1¢. Weekends follow a different schedule from weekdays. Fixed charge: $30.00 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, SRP billed its residential customers an average of 13.46¢ 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 Arizona’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 SRP