Salt River Project peak hours are the windows when electricity demand on the grid is highest — and when rates on time-of-use (TOU) plans are most expensive. For most utilities, weekday peak hours are 2 PM to 8 PM in summer and 6 AM to 10 AM plus 5 PM to 9 PM in winter. Weekends and holidays are typically off-peak all day. Exact peak windows depend on your specific TOU plan, so check your Salt River Project rate schedule for the windows that apply to your account.
Most Salt River Project TOU plans have three pricing tiers: peak (highest cost, mid-afternoon to early evening on weekdays), mid-peak or shoulder (moderate cost, mornings and late evenings), and off-peak (cheapest, overnight and weekends). The cost difference between peak and off-peak can be 2x to 4x — so even small shifts in when you use electricity make a real difference. Some plans add a "super off-peak" overnight tier that's even cheaper, designed for EV charging.
The biggest savings come from moving heavy-use activities out of the peak window. Run your dishwasher and laundry after 9 PM or before noon. Pre-cool your home before peak begins (set thermostat 2–4°F lower at 1 PM in summer, then let it drift up during peak). Charge your EV overnight on a delayed-start timer. Run pool pumps off-peak only. If you can shift 50% of usage to off-peak, expect 15–30% bill savings on a TOU plan.
TOU plans benefit customers who are flexible — work from home, retired, EV owners, and households where someone can program timers. They hurt customers who must run heavy loads during peak (e.g., afternoon child care, medical equipment, work-from-home with HVAC). Use our free bill check to see whether your current usage pattern fits a TOU plan or a flat-rate plan better.
Some Salt River Project commercial plans add demand charges (a fee based on your single highest 15-minute usage spike during peak) on top of TOU energy charges. A few residential pilots use Critical Peak Pricing (CPP) where rates spike 5–6x on a handful of "event" days when grid stress is highest. If you're enrolled in a CPP-like program, Salt River Project will notify you the day before each event so you can pre-cool and avoid heavy use.
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Disclaimer: This tool provides a rough estimate based on typical residential rates. It does not account for fixed charges, demand charges, time-of-use pricing, taxes, fees, or other bill components. Results are for informational purposes only and should not be considered financial or legal advice. We cannot determine billing accuracy without reviewing your full bill.
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