How APS’s TOU-Demand Works
APS’s “Time-of-Use 4–7pm Weekdays with Demand Charge” blends time-based energy pricing with a monthly demand fee set by your single highest on-peak hour each billing cycle.
- On-peak is 4–7 pm, Mon–Fri (weekends & APS holidays are off-peak).
- In winter bills (Nov–Apr), there’s a super off-peak window 10 am–3 pm with the lowest kWh price.
- Keep big appliances from overlapping inside 4–7 pm and lean on winter mid-days/weekends for flexible usage.
Recent & upcoming changes
- APS shortened residential on-peak from 5 hours to 3 hours (now 4–7 pm). Pricing was rebalanced to reflect fewer peak hours. Existing frozen plans like Saver Choice Plus kept their old 3–8 pm peak. (aps)
- APS filed a 2025 rate case; new rates are not expected until 2H 2026. (aps)
Before/After Bills
Typical Demand Targets & Savings Range
- DAC setpoints we aim for on APS TOU-D:
- Small/efficient home: ≤3–4 kW on-peak.
- Average 1-story electric HVAC: ≤4–5 kW.
- Large/two-story or pool/EV: ≤5–6 kW.
- Expected savings: 8–25% vs. standard energy only, mostly from peak shaving + load shifting to off-peak/super off-peak. Actual results vary by HVAC, insulation, pool/EV behavior.
Local Testimonials
