Encouraging the deployment of low carbon thermal energy networks.

Changed the term 'thermal energy network' to 'thermal energy system' in multiple sections to broaden the definition and include distributed generation sources.

Modified exemption criteria for small thermal energy providers, adding an 'opt-in' mechanism where companies can voluntarily choose to be regulated even if they meet the size threshold.

Added a new requirement for gas companies to incorporate a thermal energy network plan into their annual filings with the Public Utilities Commission.

Updated utility planning requirements to mandate consultation with gas companies when assessing opportunities for thermal energy networks.

Extended the deadline for the Public Utilities Commission to report on interoperability standards from December 1, 2026, to December 1, 2027.

Added a fiscal constraint to the grant program, stating that grants are subject to amounts appropriated for this specific purpose.

The bill's committee sponsorship changed from Environment & Energy to Appropriations, signaling a pivot toward fiscal considerations.

A new nullification clause was added, stating the act becomes void if specific funding is not appropriated by June 30, 2025.

The first reading date was updated from February 10, 2025, to February 28, 2025.

The list of amended RCW sections was slightly adjusted, removing references to chapter 19.280.