Unitil Energy Systems peak
& off-peak hours
Below is every active TOU rate plan we track for Unitil Energy Systems — 4 plans — with period boundaries verified against the published tariff. No price values; periods only.
Rate Plans
TOU-D Time of Use (Whole House) Domestic Rate
Residential| Period | Season | Days | Hours |
|---|---|---|---|
| Mid-Peak | All year | Mon–Fri | 6 AM – 3 PM |
| On-Peak | All year | Mon–Fri | 3 PM – 8 PM |
TOU-EV-D Electric Vehicle Time of Use - Domestic (Residential EV)
EV| Period | Season | Days | Hours |
|---|---|---|---|
| Mid-Peak | All year | Mon–Fri | 6 AM – 3 PM |
| On-Peak | All year | Mon–Fri | 3 PM – 8 PM |
TOU-EV-G1 Electric Vehicle Time of Use - Large General Service (Large Commercial/Industrial EV)
EV| Period | Season | Days | Hours |
|---|---|---|---|
| Mid-Peak | All year | Mon–Fri | 6 AM – 3 PM |
| On-Peak | All year | Mon–Fri | 3 PM – 8 PM |
TOU-EV-G2 Electric Vehicle Time of Use - Regular General Service (Small/Medium Commercial EV)
EV| Period | Season | Days | Hours |
|---|---|---|---|
| Mid-Peak | All year | Mon–Fri | 6 AM – 3 PM |
| On-Peak | All year | Mon–Fri | 3 PM – 8 PM |
Use these Unitil Energy Systems hours in your app.
Current period and next transition for any ZIP or address.
FAQ's
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What are Unitil Energy Systems's on-peak hours?
On the TOU-D plan (Time of Use (Whole House) Domestic Rate), on-peak hours run from 3 PM – 8 PM on weekdays. All remaining hours are classified as off-peak.
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Does Unitil Energy Systems charge more for electricity at certain times?
Yes. Unitil Energy Systems offers time-of-use (TOU) rate plans where electricity costs vary depending on the period. The period—peak, off-peak, mid-peak, or super off-peak—depends on the time, day, and season. This page lists boundaries for 4 active schedules; tou.tools does not publish pricing ($/kWh) details.
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How do I get Unitil Energy Systems time-of-use periods in my app?
Schedules are accessible programmatically via the tou.tools REST API and MCP server for AI agents. By querying a U.S. address or ZIP code, your application can instantly retrieve the current period and next scheduled transition time. Developer API keys are free.
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Do Unitil Energy Systems time-of-use hours change during holidays or seasons?
Yes. Peak hours and rate periods can vary by season (typically summer and winter halves) and special holidays. While some schedules like E-ELEC keep stable hours year-round, others introduce super off-peak windows or adjust peak times. Check each rate plan card above for specific seasonal boundaries.
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What is the best time to charge an EV under Unitil Energy Systems's plans?
For customers on EV-specific plans like TOU-EV-D, TOU-EV-G1, TOU-EV-G2, the most cost-effective time to charge is during super off-peak or off-peak hours. Charging during these designated windows significantly reduces electricity costs and minimizes demand on the grid.