Residential Time-of-Use TRREST - Single Phase
When does peak hit on Tucson Electric Power Co’s Residential Time-of-Use TRREST - Single Phase? Peak hits 3pm–7pm every day, all year.
- peak19.17¢
- mid13.14¢
- off-peak11.98¢
What does Residential Time-of-Use TRREST - Single Phase cost a year?
| Household | Uses | A month | Per year | Works out to |
|---|---|---|---|---|
| Apartment One or two people, no central air, no electric heat | 4,866 kWh | $72 | $869 | 17.8¢ / kWh |
| Family home Three or four people with central air conditioning | 9,453 kWh | $124 | $1,488 | 15.7¢ / kWh |
| Home with an EV Same house, plus an electric car charging overnight | 13,103 kWh | $165 | $1,978 | 15.1¢ / kWh |
Estimates, not quotes. We run three made-up but realistic households through this tariff hour by hour for a full year — including the way air conditioning loads the afternoon and an EV loads the small hours. Your own bill depends on when you actually use electricity, which is exactly the thing a per-kWh number hides.
What you actually pay
| Period | Rate | Applies when |
|---|---|---|
| peak | 19.17¢ up to 500 kWh20.48¢ up to 1000 kWh21.21¢ | 3pm–7pm, May–September |
| mid | 13.14¢ up to 500 kWh14.44¢ up to 1000 kWh15.17¢ | 6am–10am, 5pm–9pm, October–April |
| mid | 12.28¢ up to 500 kWh13.58¢ up to 1000 kWh14.32¢ | 9pm–6am, 10am–5pm, midnight–midnight, October–April |
| off-peak | 11.98¢ up to 500 kWh13.28¢ up to 1000 kWh14.01¢ | 7pm–3pm, midnight–midnight, May–September |
Plus a fixed charge of $20.44 per month.
Should you be on Residential Time-of-Use TRREST - Single Phase?
This is a time-of-use plan, which means the clock decides your bill as much as the meter does. At the worst hour you pay 19.2¢ a kWh; at the best hour, 12.0¢ — 1.6× apart for identical electricity.
That gap is worth real money only if you can move load into it. Every kilowatt-hour a day you shift from 3pm to midnight is about $26 a year. A dishwasher run is roughly 1.5 kWh; an EV commute charge is 8 to 12. If your day is fixed — you are home in the evening and the air conditioner runs when it runs — a plan like this costs you more, not less.
There is a usage cliff to watch. The first 500 kWh each month are billed at 12.0¢; past that line the rate steps up to 13.3¢ — 11% more for every unit after. The last kilowatt-hour of a heavy month is the expensive one, which is why cutting a little off a big month saves more than cutting the same amount off a small one.
Before a single kilowatt-hour moves, this plan charges $245 a year in fixed fees. On the apartment above that is 28% of the whole bill; on the house with a car charging in it, 12%. Fixed charges are invisible in a cents-per-kWh comparison and they punish small users hardest — if you use very little electricity, the headline rate is the least important number on this page.
Expect the bill to move with the calendar. The same family home costs about $173 in July and $95 in February — a $78 spread driven by heating and cooling far more than by anything you chose. Budget against the July figure, not the average, and a summer bill stops being a surprise.
How it compares to Tucson Electric Power’s other plans
Measured against the other residential plans this utility files, a family home lands 4th cheapest of 8. The cheapest option, Special Residential Electric Service Time-of-Use Program TRRSPT - Single Phase, would run about $63 a year less.
Against Residential Electric Service TRRES (Single Phase), which looks like the plan you land on by default, this one comes out $59 less per year (4%). We infer the default from the tariff structure rather than a flag in the data, so confirm it against your own bill before you switch.
Other Tucson Electric Power plans
- Residential Demand Time-of-Use TRRESDT - Single Phasedemand
- Residential Demand Time-of-Use TRRESDT - Three Phasedemand
- Residential Electric Service TRRES (Single Phase)flat
- Residential Electric Service TRRES (Three Phase)flat
- Residential Service Peak Demand TRRESD (Single Phase)demand
- Residential Service Peak Demand TRRESD (Three Phase)demand
- Residential Time-of-Use TRREST - Three PhaseTOU
- Special Residential Electric Service Time-of-Use Program TRRSPT - Single PhaseTOU
- Special Residential Electric Service Time-of-Use Program TRRSPT - Three PhaseTOU
- Special Residential Electric Service TRRSP - Single Phaseflat
- Special Residential Electric Service TRRSP - Three Phaseflat
Who can be on Tucson Electric Power’s Residential Time-of-Use TRREST - Single Phase?
Eligibility is not our judgement — it is written into the tariff Tucson Electric Power filed. This is what that document says:
Applicable for all single-phase residential electric service in individual private dwellings and individually metered apartments when all services is supplied at one point of delivery and energy is metered through one meter. The service shall be single phase, 60 Hertz.
Quoted from the filed tariff. Your utility decides eligibility, not us; check with them before you switch.
If this is new to you
- Tiered billing for electricity: why the last kWh costs more
A cheap allowance, then a cliff. Where the cliff sits is the whole game.
- When is electricity cheapest? Off-peak hours explained
Overnight, usually. All weekend, often. The exact hours are in your tariff, not in a rule of thumb.
- Should you switch to a time-of-use electricity plan?
A wide peak-to-off-peak gap is a lever, not a saving. Levers need something to move.
- When should you charge an electric car at home?
The single biggest load most homes can move, and the easiest to automate.
Where this comes from
- Effective
- 2025-09-30
the date this tariff took effect
- Covers
- delivery + supply
the ZIP-code service map lists this territory as bundled, so the utility sells delivery and supply together
- Enrollment
- open to new customers
Tariff document: https://docs.tep.com/wp-content/uploads/102-TRREST.pdf