HomeWattCost

TEP TRRES vs TRREST

For a typical Arizona home using 1,054 kWh a month, TRREST is cheaper by about $50 a year ($172 against $176 a month). TRREST is cheaper at every level of use from 200 to 2,500 kWh a month, with the same daily pattern of use.

Utility TEPTariffs checked 2026-11-12Typical use 1,054 kWh/mo, Arizona

Head to head

ScenarioTRRESTRRESTCheaper
Typical home, per month$176$172TRREST
All-in price per kWh16.7¢16.3¢TRREST
Home + EV, charged at the cheapest hour$219$211TRREST
Home + EV, plugged in at 6 pm$219$217TRREST
Fixed charge$15.39$12.32

Typical home: Arizona average use by month (EIA), shaped hour by hour (NREL ResStock), before taxes. EV: Tesla Model Y Long Range AWD, 1,000 miles a month; cheapest start any hour on TRRES, 12 am on TRREST.

Month by month

Typical-home bill each month on each plan.

PlanJanFebMarAprMayJunJulAugSepOctNovDec
TRRES$128$110$143$138$177$240$282$295$217$144$118$122
TRREST$123$106$138$133$176$237$277$290$214$139$114$118

TRRES: price by hour

July weekday.

Same price all day
16.0¢12a3a6a9a12p3p6p9p12a

TRREST: price by hour

July weekday.

Off-peakPeak
14.4¢21.7¢14.4¢12a3a6a9a12p3p6p9p12a

TRRES or TRREST: common questions

Is TRRES or TRREST cheaper?

For a typical Arizona home using 1,054 kWh a month, TRREST is cheaper by about $50 a year ($172 against $176 a month). TRREST is cheaper at every level of use from 200 to 2,500 kWh a month, with the same daily pattern of use. Adding an EV driven 1,000 miles a month and charged at each plan’s cheapest hour, TRREST gives the lower total ($211 against $219 a month).

What is the difference between TRRES and TRREST?

TRRES is tiered: the price per kWh rises with monthly use, with a fixed charge of $15.39 a month. TRREST is time-of-use (summer weekdays: Peak 3 pm–7 pm; lowest price 7 pm–3 pm next day), with a fixed charge of $12.32 a month.

How the two plans work

TRRES: Residential Service Basic

  • In July the first 500 kWh a month cost 15.1¢ each; then 17.2¢ above 500 kWh a month, then 15.3¢ above 549 kWh a month, then 16.0¢ above 1,000 kWh a month.
  • An average Arizona home (1,711 kWh in July) goes past the first tier, so extra load such as an EV is priced higher.
  • Fixed charge: $15.40 a month.

TRREST: Residential Service Time-of-Use

  • Peak 3 pm–7 pm on July weekdays; 4 of 24 hours carry the top price of 21.7¢.
  • The cheapest July weekday hour costs 14.4¢, so moving 1 kWh out of the top hours saves 7.3¢.
  • January weekdays range from 14.0¢ to 14.9¢.
  • Summer pricing applies May–Sep; winter pricing Oct–Apr.
  • Weekends differ: off-peak all day.
  • Fixed charge: $12.32 a month.

Your own pattern of use decides the winner: compare every TEP plan on your usage, or see all TEP plans, sources and peak hours.