Arizona time-of-use hours by utility

Across the 17 residential TOU plans tou.tools tracks in Arizona, the most common on-peak window is 6 PM – 9 PM (7 plans); others run 6 AM – 9 AM and 3 PM – 7 PM. Every hour outside the on-peak (and any mid-peak) window is billed as off-peak. Exact boundaries vary by utility and plan — see each utility's schedule above.

tou.tools tracks 8 Arizona utilities with at least one active TOU rate plan — 49 active schedules in total. The largest by customers served are Arizona Public Service Co, Salt River Project, and Tucson Electric Power Co. They span investor-owned utilities, electric cooperatives, and political subdivisions. The full list above is sorted by customers served.

On the residential TOU plans we track in Arizona, on-peak hours apply on weekdays only — weekends are off-peak across all 17 plans. Many tariffs also treat observed holidays as off-peak; the Days column in each schedule above shows the exact rule.

Some do. Of the 17 residential TOU plans we track in Arizona, 12 shift their period boundaries between seasons (typically summer and winter), while 5 keep the same hours year-round. Each schedule above lists its exact season dates.

tou.tools tracks 6 EV-specific rate plans in Arizona (E-14, E-29, EGDCFCX, ERDSOTE, ERSOTE, and TRDSOTE). On EV time-of-use plans the lowest-cost window is generally the overnight super-off-peak or off-peak period; charging then avoids the on-peak window. See the EV plan schedules for the exact hours.

tou.tools maps 375 Arizona ZIP codes to the utilities that serve them. Because service territories can overlap, a ZIP may return more than one candidate utility; supplying a full street address resolves it to a single utility via a geocoded point-in-territory lookup. The REST API and MCP server both return the matching utility and its current TOU period.