Is Washington ESSB 5445 in force?

Yes. Signed into law May 13, 2025. In force from Jul 27, 2025.

Which products does Washington ESSB 5445 affect?

Washington ESSB 5445 affects Residential energy storage systems, Commercial and utility energy storage systems, and Solar PV.

When does Washington ESSB 5445 take effect?

The effective date on file is July 27, 2025.

Washington

ESSB 5445

PartialRead in the state’s own source. It stays partial until the passage is on file word for word.

What does Washington ESSB 5445 do? Lets small solar arrays under 1,000 square feet, parking-lot solar canopies, and landfill solar skip state environmental review. Storage that cuts system peak demand can count as demand response toward utility targets. Utilities may count new distributed generation in priority locations at four times its output through Dec 31, 2029.

Facts

Kind: Bill
Status: Signed into law
Stage: In force
Signed or decided: May 13, 2025
Effective: July 27, 2025
Topics: Permitting, Incentives and programs
Products: Residential energy storage systems Commercial and utility energy storage systems Solar PV
Source: Washington State Legislature (opens in a new tab)
Citation: ESSB 5445 (2025 regular session), Chapter 265, Laws of 2025

The state’s codes

The codes that reach each product this law names, with the edition Washington is on. Each links to the record.

For information only. Your local building or fire official decides which code applies. We check state records often but can miss a recent change, so confirm with your official before you design, permit, or install. Terms of use