Colorado time-of-use hours by utility

Across the 15 residential TOU plans tou.tools tracks in Colorado, the most common on-peak window is 5 PM – 9 PM (7 plans); others run 4 PM – 9 PM and 4 PM – 8 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 10 Colorado utilities with at least one active TOU rate plan — 42 active schedules in total. The largest by customers served are Public Service Co of Colorado, City of Colorado Springs, and CORE Electric Cooperative. They span investor-owned utilities, municipal utilities, and electric cooperatives. The full list above is sorted by customers served.

It depends on the plan. Of the 15 residential TOU plans we track in Colorado, 3 apply on-peak periods every day including weekends, while 12 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 15 residential TOU plans we track in Colorado, 2 shift their period boundaries between seasons (typically summer and winter), while 13 keep the same hours year-round. Each schedule above lists its exact season dates.

tou.tools tracks 5 EV-specific rate plans in Colorado (EV-PUB, LGS-SEV, LGS-SNEV, P-EV, and S-EV). 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 399 Colorado 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.