Hawaii time-of-use hours by utility
Every Hawaii electric utility we track with at least one active time-of-use rate plan, with peak and off-peak hours verified against the published tariff. Periods only — no price values.
Every TOU schedule on this page verified since
Utilities in Hawaii
Sorted by number of customers served in Hawaii.
Frequently asked
-
What are the typical time-of-use on-peak hours in Hawaii?
All 5 TOU plans tou.tools tracks in Hawaii place on-peak hours at 5 PM – 10 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.
-
Which electric utilities in Hawaii offer time-of-use rate plans?
tou.tools tracks 3 Hawaii utilities with at least one active TOU rate plan — 5 active schedules in total. The largest by customers served are Hawaiian Electric Co Inc, Hawaii Electric Light Co Inc, and Maui Electric Co Ltd. They span investor-owned utilities. The full list above is sorted by customers served.
-
Do Hawaii time-of-use peak hours apply on weekends?
On the TOU plans we track in Hawaii, on-peak hours apply every day of the week, including weekends (all 5 plans). Many tariffs also treat observed holidays as off-peak; the Days column in each schedule above shows the exact rule.
-
Do Hawaii time-of-use hours change by season?
Not on the plans we track. All 5 TOU plans in Hawaii keep the same period hours year-round. Each schedule above lists its exact season dates.
-
When is the cheapest time to charge an EV in Hawaii?
tou.tools tracks 2 EV-specific rate plans in Hawaii (EV-J and EV-P). 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.
-
How do I find which Hawaii utility serves a specific address or ZIP code?
tou.tools maps 81 Hawaii 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.
Time-of-use periods for all of Hawaii, one API.
Resolve any Hawaii ZIP or address to its utility and get the current period plus the next transition — over REST or MCP.