Quick answer
Size standby generators by critical load list (heat, fridge, sump, lights, medical) — whole-home kW ratings typically range [PROOF: kW tiers Eco installs] with automatic transfer switch and gas/propane fuel supply.
- Compare practical options by risk, cost range, and comfort outcome.
- Identify what to verify in an estimate before you sign.
- Choose a path that fits your budget and timeline.
Planning storm backup
Before wind season — install queues fill in fall.
Compare your options
Essential circuits
Lower kW, lower cost, covers survival loads.
Whole home
Higher kW for full comfort — requires adequate gas supply.
Key terms and context
This guide is written for electrical decisions in the Puget Sound. It uses the same terminology you'll hear from inspectors, technicians, and permit offices.
Undersized generator
Overload tripping during startup surges — heat pump compressors need surge allowance.
How we build this guidance
- Straight answers first, so you know your options without the fluff.
- Written and reviewed by techs who do this work every day.
- Specific to Puget Sound homes, weather, and utilities.
- Updated 2026-06-08 from real electrical jobs around the region.
Methodology: Load listing per manufacturer sizing software.
Last updated: 2026-06-08
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Common questions
Natural gas or propane?
Homes on PSE gas use natural gas; propane where no gas line — Eco sizes tank accordingly.