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Tucson Electric Power Co rate plans
12 residential plans are currently open to new customers. Some charge different prices depending on the hour — which is where most of the savings hide.
How much does the plan you pick actually matter here?
Run the same three-bedroom house with central air through every plan Tucson Electric Power Co files, and the bill lands anywhere between $996 and $1,607 a year. That $611 spread is not a difference in electricity — it is the same kilowatt-hours, from the same wires, priced under different rules. Nobody sends you a letter when you are on the wrong side of it.
The plan most households land on by default, Residential Electric Service TRRES (Single Phase), comes to about $1,547. The cheapest option here, Residential Demand Time-of-Use TRRESDT - Single Phase, comes to $996 — a gap of about $551 a year for a household that never changed a single habit. Whether you can actually capture that depends on when you use power, which is what the calculator below is for.
4 of these 12 plans price by the hour. Those are the ones where moving laundry, dishes, or car charging into the cheap window changes the bill; on the rest, the clock is irrelevant and only the total matters. Which camp you belong in is the first question worth settling, because it decides whether shifting your day is worth anything at all.
Watch the fixed charges too. Across these plans they run from $245 to $341 a year before a single kilowatt-hour is counted. For a small household that difference alone can outweigh the per-kWh price, which is why comparing cents per kilowatt-hour on its own quietly misleads.
Which plan would cost you least?
No bill upload, no sign-up. Tell us roughly what you use and what runs on electricity — we price every plan against the same household and show you the gap.
That adds up to 7,914 kWh a year. Compare it to the total on your bill and adjust until it’s close.
Same usage, different plan
$515a year
That is the gap between the cheapest plan you could be on — Residential Demand Time-of-Use TRRESDT - Single Phase — and the priciest. Not by using less power. By being billed differently for the same power.
| Plan | Per year | Vs best |
|---|---|---|
| Residential Demand Time-of-Use TRRESDT - Single PhasePeak hits 6am–9am, 6pm–9pm, 9pm–6am, 9am–6pm in Oct–Apr; 3pm–7pm in May–Sep — every day. | $862 | — |
| Residential Service Peak Demand TRRESD (Single Phase)The hour never matters here — only the season. Rates peak May–September. | $904 | +$42 |
| Residential Demand Time-of-Use TRRESDT - Three PhasePeak hits 6am–9am, 6pm–9pm, 9pm–6am, 9am–6pm in Oct–Apr; 3pm–7pm in May–Sep — every day. | $922 | +$60 |
| Residential Service Peak Demand TRRESD (Three Phase)The hour never matters here — only the season. Rates peak May–September. | $964 | +$102 |
| Special Residential Electric Service Time-of-Use Program TRRSPT - Single PhasePeak hits 6am–10am, 5pm–9pm, 9pm–6am, 10am–5pm in Oct–Apr; 2pm–8pm in May–Sep — every day. | $1,208 | +$346 |
| Special Residential Electric Service TRRSP - Single PhaseThe hour never matters here — only the season. Rates peak May–September. | $1,242 | +$380 |
| Residential Time-of-Use TRREST - Single PhasePeak hits 6am–10am, 5pm–9pm, 9pm–6am, 10am–5pm in Oct–Apr; 3pm–7pm in May–Sep — every day. | $1,262 | +$400 |
| Special Residential Electric Service Time-of-Use Program TRRSPT - Three PhasePeak hits 6am–10am, 5pm–9pm, 9pm–6am, 10am–5pm in Oct–Apr; 2pm–8pm in May–Sep — every day. | $1,268 | +$406 |
| Special Residential Electric Service TRRSP - Three PhaseThe hour never matters here — only the season. Rates peak May–September. | $1,302 | +$440 |
| Residential Electric Service TRRES (Single Phase)The hour never matters here — only the season. Rates peak May–September. | $1,317 | +$455 |
| Residential Time-of-Use TRREST - Three PhasePeak hits 6am–10am, 5pm–9pm, 9pm–6am, 10am–5pm in Oct–Apr; 3pm–7pm in May–Sep — every day. | $1,322 | +$460 |
| Residential Electric Service TRRES (Three Phase)The hour never matters here — only the season. Rates peak May–September. | $1,377 | +$515 |
An estimate, not a quote. Supply charges move month to month, and your real usage pattern is not exactly this one. What it does show reliably is the gap between plans — both are priced off the same assumptions.
Before you switch anything
- What is a time-of-use electricity rate?
The same kilowatt-hour, priced differently depending on when you use it.
- 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.
- How to compare electricity plans without getting it wrong
Six things that break a comparison, and the order to check them in.
Every plan, in detail
Hour-by-hour schedules, tier thresholds, and the tariff each one comes from.
- Residential Demand Time-of-Use TRRESDT - Single Phasedemand charge
Peak hits 6am–9am, 6pm–9pm, 9pm–6am, 9am–6pm in Oct–Apr; 3pm–7pm in May–Sep — every day.
7.0–14.2¢ - Residential Demand Time-of-Use TRRESDT - Three Phasedemand charge
Peak hits 6am–9am, 6pm–9pm, 9pm–6am, 9am–6pm in Oct–Apr; 3pm–7pm in May–Sep — every day.
7.0–14.2¢ - Residential Electric Service TRRES (Single Phase)flat
The hour never matters here — only the season. Rates peak May–September.
12.4–15.6¢ - Residential Electric Service TRRES (Three Phase)flat
The hour never matters here — only the season. Rates peak May–September.
12.4–15.6¢ - Residential Service Peak Demand TRRESD (Single Phase)demand charge
The hour never matters here — only the season. Rates peak May–September.
8.2–8.6¢ - Residential Service Peak Demand TRRESD (Three Phase)demand charge
The hour never matters here — only the season. Rates peak May–September.
8.2–8.6¢ - Residential Time-of-Use TRREST - Single Phasetime-of-use
Peak hits 6am–10am, 5pm–9pm, 9pm–6am, 10am–5pm in Oct–Apr; 3pm–7pm in May–Sep — every day.
12.0–21.2¢ - Residential Time-of-Use TRREST - Three Phasetime-of-use
Peak hits 6am–10am, 5pm–9pm, 9pm–6am, 10am–5pm in Oct–Apr; 3pm–7pm in May–Sep — every day.
12.0–21.2¢ - Special Residential Electric Service Time-of-Use Program TRRSPT - Single Phasetime-of-use
Peak hits 6am–10am, 5pm–9pm, 9pm–6am, 10am–5pm in Oct–Apr; 2pm–8pm in May–Sep — every day.
11.4–19.0¢ - Special Residential Electric Service Time-of-Use Program TRRSPT - Three Phasetime-of-use
Peak hits 6am–10am, 5pm–9pm, 9pm–6am, 10am–5pm in Oct–Apr; 2pm–8pm in May–Sep — every day.
11.4–19.0¢ - Special Residential Electric Service TRRSP - Single Phaseflat
The hour never matters here — only the season. Rates peak May–September.
11.5–14.6¢ - Special Residential Electric Service TRRSP - Three Phaseflat
The hour never matters here — only the season. Rates peak May–September.
11.5–14.6¢