City of Seattle time-of-use hours

On RTC, on-peak hours run 5 PM – 9 PM on weekdays. Below is every active TOU rate plan we track for City of Seattle — 1 plan — with period boundaries verified against the published tariff. No price values; periods only.

For developers & agents

Query City of Seattle periods programmatically.

One call returns the current period and the next transition time for any U.S. ZIP or address — GET /query/current over REST, or the same data through MCP for AI agents.

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Rate plan schedules

Every active time-of-use plan we track for City of Seattle, with its period boundaries.

RTC Residential Time of Use Residential
PeriodSeasonDaysHours
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
Effective
May 4, 2026
Verified

Frequently asked

  1. What are City of Seattle'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.

  2. Does City of Seattle charge more for electricity at certain times?

    Yes. City of Seattle 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 1 active schedules; tou.tools does not publish pricing ($/kWh) details.

  3. How do I get City of Seattle 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.

  4. Do City of Seattle 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.