Washington time-of-use hours by utility

Across the 8 residential TOU plans tou.tools tracks in Washington, the most common on-peak window is 5 PM – 8 PM (5 plans); others run 6 AM – 9 AM and 7 AM – 10 AM. 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 5 Washington utilities with at least one active TOU rate plan — 12 active schedules in total. The largest by customers served are Puget Sound Energy Inc, City of Seattle, and Avista Corp. They span investor-owned utilities, municipal utilities, and political subdivisions. The full list above is sorted by customers served.

It depends on the plan. Of the 8 residential TOU plans we track in Washington, 1 apply on-peak periods every day including weekends, while 7 restrict on-peak to weekdays and treat weekends as off-peak. Many tariffs also treat observed holidays as off-peak; the Days column in each schedule above shows the exact rule.

Some do. Of the 8 residential TOU plans we track in Washington, 6 shift their period boundaries between seasons (typically summer and winter), while 2 keep the same hours year-round. Each schedule above lists its exact season dates.

tou.tools tracks 2 EV-specific rate plans in Washington (WA-SCHEDULE-13 and WA-SCHEDULE-23). 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 1,061 Washington 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.