Seattle City Light peak
& off-peak hours
Below is every active TOU rate plan we track for Seattle City Light — 3 plans — with period boundaries verified against the published tariff. No price values; periods only.
Rate Plans
RTC Residential Time of Use
Residential| Period | Season | Days | Hours |
|---|---|---|---|
| Mid-Peak | All year | Mon–Sat | 6 AM – 5 PM |
| Mid-Peak | All year | Sun–Sun | 6 AM – 12 AM |
| On-Peak | All year | Mon–Sat | 5 PM – 9 PM |
| Mid-Peak | All year | Mon–Sat | 9 PM – 12 AM |
LG Large General Service
Commercial| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Mon–Sat | 6 AM – 10 PM |
HD High Demand General Service
Industrial| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Mon–Sat | 6 AM – 10 PM |
Use these Seattle City Light hours in your app.
Current period and next transition for any ZIP or address.
FAQ's
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What are Seattle City Light's on-peak hours?
On the RTC plan (Residential Time of Use), on-peak hours run from 5 PM – 9 PM on weekdays. All remaining hours are classified as off-peak.
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Does Seattle City Light charge more for electricity at certain times?
Yes. Seattle City Light 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 3 active schedules; tou.tools does not publish pricing ($/kWh) details.
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How do I get Seattle City Light 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 Seattle City Light 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.