SRP Peak Hours: Find Your Plan’s Schedule
These official sources support the information in this guide.
SRP has several different peak-hour schedules. Before setting a timer, check the full plan name on your bill or SRP account. A neighbor’s schedule can be wrong for your household—even if you both have SRP.
The planner covers ten named residential time-of-day plans, including solar variants. It does not change your utility plan or estimate your bill. No account number or bill upload is needed.
Your plan, your day
When should I run it?
Choose your enrolled plan, then check a day and a run time for a dishwasher, pool pump, or EV charger. All times are Arizona / Mountain Standard Time (UTC−7), even if you are traveling.
Not sure? Match the full plan name in your bill or SRP account to the list. “Time-of-use” alone is not enough. If your plan is Basic, read the Basic plan answer below. M-Power, pilot, and unlisted plans are not modeled here. Find your plan with SRP.
This checks elapsed time in each period, not electricity use or savings. Appliance power can vary during a cycle. Follow equipment instructions and keep essential cooling and medical equipment operating as needed. We count completed planner checks to understand whether the tool is useful. Your plan, date, and run details stay in this page and are not sent to analytics.
Does SRP Basic have peak hours?
No. On SRP’s Basic Price Plan, the energy price does not change with the hour of the day. The amount of electricity you use and the applicable seasonal rate still affect your energy charge. Moving the same electricity use to a different hour within the same billing season does not create a time-of-day discount.
“Summer Peak” means July and August on this plan. It is a seasonal price label, not a daily block of expensive hours. SRP applies the seasonal rate in effect on your meter-read date to the usage on that bill.
If your bill says Basic, you do not need the time-of-day planner above. Confirm the full plan name before using a schedule intended for another plan.
Source: SRP Basic Price Plan guidance, checked September 4, 2026. Current plan guidance; no Basic bill estimate or new rate values are modeled here.
Compare the weekday schedules
All times below are Mountain Standard Time. On-peak windows exclude weekends and the six named SRP holidays. Super off-peak periods, where offered, apply every day.
| Plan | Weekday on-peak | Super off-peak |
|---|---|---|
| Conserve — E-28 | 6–9 p.m., year-round | 8 a.m.–3 p.m. |
| Manage Demand — E-16 | 5–10 p.m., year-round | 8 a.m.–3 p.m. |
| EZ-3 — E-21 / E-22 | 3–6 p.m. / 4–7 p.m., year-round | None |
| Time-of-Use — E-26; Customer Generation — E-27; Average Demand — E-15; TOU Export — E-13 | May–Oct: 2–8 p.m. Nov–Apr: 5–9 a.m. and 5–9 p.m. | None |
| Electric Vehicle — E-29; EV Export — E-14 | May–Oct: 2–8 p.m. Nov–Apr: 5–9 a.m. and 5–9 p.m. | 11 p.m.–5 a.m. |
E-28 and E-16 use these clocks for both solar and non-solar customers. Matching hours do not mean matching bill calculations. Older plans may be closed to new enrollment; check your current enrollment rather than choosing a schedule because it looks cheaper.
Two examples: the same task, different timing
A two-hour dishwasher run at 5 p.m. on Friday, September 4: on Conserve E-28, the first hour is off-peak and the second is on-peak. Starting at 9 p.m. avoids on-peak entirely. Starting at noon keeps the whole run in super off-peak. On E-27, the 5 p.m. start is entirely on-peak; an 8 p.m. start avoids it.
A four-hour EV charging session at 11 p.m.: E-29 puts the whole session in super off-peak. On E-28, that overnight session is off-peak, while an 8 a.m. start would fit in super off-peak. These are schedule examples, not promises of savings. Use the EV charging calculator with your own consumption and applicable price.
Holidays and exceptions
SRP names New Year’s Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day. In 2026, the weekday dates are January 1, May 25, September 7, November 26, and December 25. Those days have no on-peak window; super off-peak periods remain in place.
Independence Day is Saturday, July 4. The reviewed tariff says “observed” without specifying the weekend rule. The planner asks you to confirm July 3 or July 6 with SRP instead of guessing. Christmas Eve and the day after Thanksgiving are not on SRP’s list. APS has its own holiday rules.
Sources and limits of the planner
Schedule definitions were checked September 4, 2026 against the residential Conditions sections of the SRP ratebook published April 27, 2026. SRP’s Conserve, Manage Demand, EZ-3, and Time-of-Use pages provide customer-facing context.
The planner splits a run into minutes in each period and checks the following day if it crosses midnight. Suggested later starts use 15-minute steps and must finish before midnight that day. It does not calculate electricity use, rates, demand charges, or solar exports. Dates outside 2026 need a fresh review. Demand charges on E-16, E-15, and E-27 require more than a timing check.
For E-27 specifically, use the bill worksheet and demand-charge guide. The detailed E-27 reference below retains its separate July rate-check date.
E-27 details: seasonal rates, demand tiers, and FAQs
Summer on-peak
2-8pm weekdays
May 1–October 31, excluding E-27 holidays
Winter on-peak
5-9am & 5-9pm
November 1–April 30 weekdays; not 2-8pm year-round
Demand basis
Max 30-min kW
Highest on-peak interval in the billing cycle, tiered
On SRP's E-27 Customer Generation Price Plan, peak hours are not 2pm–8pm every day of the year. Summer weekdays use a 2pm–8pm on-peak window. Winter weekdays use morning and evening windows instead. Demand is progressive, not a single flat dollars-per-kW number.
This E-27 reference section uses SRP's E-27 tariff in the 2025/2026 ratebook (published 2026-04-27), including the temporary May–October 2026 fuel and purchased-power adjustment already reflected in the site constants. This section covers E-27 only. Other SRP residential plans use different peak windows. Confirm the plan name on your bill before copying this schedule.
Who this schedule applies to
E-27 is limited to residential customers with on-site generation who do not buy all of their energy from SRP. It is currently marketed as the Customer Generation Price Plan. The ratebook states the plan will be eliminated as of the November 2029 billing cycle, with remaining customers moved to E-16. Non-generation SRP plans are outside this section.
Current E-27 on-peak and off-peak windows
| Calendar period | On-peak (MST) | Off-peak |
|---|---|---|
| May 1 – October 31 | 2 p.m. – 8 p.m. Monday–Friday, excluding holidays | All other hours, weekends, and holidays |
| November 1 – April 30 | 5 a.m. – 9 a.m. and 5 p.m. – 9 p.m. Monday–Friday, excluding holidays | All other hours, weekends, and holidays |
Times are Mountain Standard Time as written in the tariff. Weekends are off-peak all day on E-27. Christmas Eve and the day after Thanksgiving are not on the E-27 holiday list, so a weekday Christmas Eve or Black Friday still uses the normal on-peak windows.
E-27 off-peak holidays in 2026
The tariff names six holidays: New Year's Day (observed), Memorial Day, Independence Day (observed), Labor Day, Thanksgiving Day, and Christmas Day (observed). Those days are off-peak all day.
| Holiday | 2026 date | E-27 treatment |
|---|---|---|
| New Year’s Day (observed) | Thu, Jan 1 | Off-peak all day |
| Memorial Day | Mon, May 25 | Off-peak all day |
| Independence Day (observed) | Jul 4 is Sat in 2026 | Off-peak all day on the observed weekday SRP applies |
| Labor Day | Mon, Sep 7 | Off-peak all day |
| Thanksgiving Day | Thu, Nov 26 | Off-peak all day |
| Christmas Day (observed) | Fri, Dec 25 | Off-peak all day |
July 4 falls on Saturday in 2026. The E-27 tariff names Independence Day as observed but does not spell out the weekend observation rule in the ratebook text reviewed for this section. Saturday is already off-peak because it is a weekend. Confirm the observed weekday on your SRP materials or bill if you need certainty for a specific date.
Three billing seasons for prices
Peak hours follow the May–October and November–April windows above. Energy and demand prices use three billing-cycle seasons from the ratebook:
- Summer: May, June, September, and October billing cycles
- Summer Peak: July and August billing cycles
- Winter: November through April billing cycles
| Billing season | On-peak energy | Off-peak energy | Demand tiers ($/kW) |
|---|---|---|---|
| Summer | 6.24¢/kWh | 5.22¢/kWh | $9.77 / $16.24 / $29.18 |
| Summer Peak (Jul–Aug) | 7.85¢/kWh | 5.75¢/kWh | $11.90 / $19.97 / $36.05 |
| Winter | 6.73¢/kWh | 6.34¢/kWh | $4.93 / $7.02 / $11.00 |
Demand tiers are first 3 kW, next 7 kW, and all additional kW. Service charges are $20, $30, or $40 depending on dwelling type and service amperage. These are tariff core charges before taxes and other riders. Model the base math with the SRP E-27 bill calculator.
Why progressive demand matters more than the energy spread
In July–August, moving one kWh from on-peak to off-peak changes the base energy charge by about 2.10¢. In winter, the energy spread is only about 0.39¢ per kWh. The larger E-27 lever is usually the on-peak demand charge.
Example only: an 8 kW maximum thirty-minute on-peak demand in a July–August billing cycle prices as 3 kW × $11.90 plus 5 kW × $19.97, or about $135.55 for that cycle's demand charge alone. It is not 8 × a single flat $/kW rate. Your meter and bill decide the actual demand.
- Avoid stacking AC, pool pumps, dryers, ovens, and Level 2 EV charging inside the same on-peak half-hour.
- In summer, finish major flexible loads before 2pm or start them after 8pm on weekdays.
- In winter, watch both the morning 5–9am window and the evening 5–9pm window—not only late afternoon.
- Use the pool pump calculator and EV charging calculator for equipment-level timing estimates.
- For solar self-use versus export timing on E-27, remember exports are netted by matching time-of-use period, not one flat export rate.
Do not mix E-27 with other SRP peak schedules
Other SRP residential plans use different clocks. For example, some demand and TOU plans use evening-centered windows rather than E-27's summer 2–8pm block and winter split windows. APS TOU-E is also different: a 4–7pm weekday peak with a winter super-off-peak band—see the APS off-peak hours guide. The plan printed on your bill is the authority.
SRP publishes current plan materials on its price plans section. If a consumer page and the ratebook ever disagree, use the ratebook and your bill.
Frequently asked questions
What are SRP E-27 peak hours in summer?
From May 1 through October 31, on-peak hours are 2 p.m. to 8 p.m. Mountain Standard Time, Monday through Friday, excluding the six tariff holidays. All other hours are off-peak.
What are SRP E-27 peak hours in winter?
From November 1 through April 30, on-peak hours are 5 a.m. to 9 a.m. and 5 p.m. to 9 p.m. Mountain Standard Time, Monday through Friday, excluding the same holidays. The summer 2–8pm window does not apply in winter on E-27.
Does E-27 use one flat demand charge?
No. Billing demand is the maximum thirty-minute integrated kilowatt reading during on-peak periods in the billing cycle. That demand is priced in progressive tiers for the first 3 kW, the next 7 kW, and all additional kW, with different tier prices by billing season.
Source notes
- SRP ratebook with temporary FPPAM (E-27 section) — on-peak definitions, holidays, seasons, energy prices, progressive demand tiers, service-charge tiers, demand interval, export netting, and November 2029 elimination note. Published 2026-04-27.
- Site constants in
SRP_RATES— verified 2026-07-27 against that ratebook for calculator use. - SRP price plans hub — consumer-facing plan navigation; not a substitute for the tariff text.
Source set reviewed 2026-07-27. Rates, temporary adjustments, and plan availability can change. The linked SRP ratebook and your own bill take priority over this summary. Results on the companion calculator are estimates of core E-27 charges, not a complete bill.