Electric Transmission System Regulation

State Bills: Washington

Published March 31st, 2026

Detected April 1st, 2026

Summary

The Washington State Senate passed SB 6355, legislation concerning the electric transmission system, on March 3, 2026 with a 30-19 vote. The bill was referred to the House Appropriations Committee after passage. Sponsored by a coalition of legislators including Hunt, Kauffman, and Chapman, the legislation establishes new regulatory requirements for electric transmission infrastructure in Washington State.

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What changed

SB 6355 establishes new regulatory requirements for electric transmission systems in Washington State. The substitute version (SSB 6355) was passed by the Senate on March 3, 2026 (30 yeas, 19 nays) and referred to the House Appropriations Committee on March 4, 2026. The bill is chaptered as C 249 L 26, indicating it has been enacted into state law.

Energy companies operating electric transmission infrastructure in Washington should review SSB 6355 to understand compliance requirements. The bill has a companion measure HB 2741 in the House. Legal and compliance teams should monitor the final chaptered version for specific obligations, effective dates, and any associated penalties for non-compliance.

What to do next

Review SSB 6355 requirements for electric transmission system operations
Monitor for final chaptered version with specific effective dates
Assess compliance obligations against current transmission infrastructure practices

Source document (simplified)

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SB 6355 - 2025-26

Concerning the electric transmission system. Sponsors: Hunt, Kauffman, Chapman, Conway, Dhingra, Pedersen, Saldaña, Shewmake, Stanford Companion bill: HB 2741

Bill status-at-a-glance

As of Tuesday, March 31, 2026 10:32 PM

Current version:

Substitute - SSB 6355 (View 1st substitute)

Current status:

C 249 L 26

Where is it in the process?

Bill status-at-a-glance

As of Tuesday, March 31, 2026 10:32 PM

Current version:

Substitute - SSB 6355 (View 1st substitute)

Current status:

C 249 L 26

Where is it in the process?

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Bill history

View all roll calls on this bill

2026 Regular Session

In the Senate

Feb 24 First Reading. (View original bill) Held at the Desk. Feb 26 On motion, referred to Ways & Means. Public hearing in the Senate Committee on Ways & Means at 1:30 PM. (Committee materials) Mar 2 Executive action taken in the Senate Committee on Ways & Means at 10:30 AM. (Committee materials) WM - Majority; 1st substitute bill be substituted, do pass. (View 1st substitute) (Majority report) Minority; do not pass. (Minority report) Minority; without recommendation. (Minority report) Passed to Rules Committee for second reading. Mar 3 Placed on second reading by Rules Committee. 1st substitute bill substituted (WM 26). (View 1st substitute) Rules suspended. Placed on Third Reading. Third reading, passed; yeas, 30; nays, 19; absent, 0; excused, 0. (View this roll call)

In the House

Mar 4 First reading, referred to Appropriations. Mar 5 Public hearing in the House Committee on Appropriations at 8:00 AM. (Committee materials) Mar 9 Executive action taken in the House Committee on Appropriations at 8:00 AM. (Committee materials) APP - Majority; do pass with amendment(s). (Majority report) Minority; do not pass. (Minority report) Referred to Rules 2 Review. Rules Committee relieved of further consideration. Placed on second reading. Mar 11 Committee amendment not adopted. Floor amendment(s) adopted. Rules suspended. Placed on Third Reading. Third reading, passed; yeas, 66; nays, 27; absent, 0; excused, 5. (View this roll call)