Making the implementation of climate policy contingent on the department of ecology reporting greenhouse gas emissions in a manner that allows for measuring the effectiveness of those policies.

HB 2150 requires Washington's Department of Ecology to publish a complete greenhouse gas emissions inventory by January 1, 2027, and update it quarterly thereafter. If the department misses these deadlines, certain climate policies that impose costs on consumers or businesses (like utility or fuel regulations) will no longer be enforced. The bill directly affects households and businesses bearing higher energy costs from existing climate programs. It aims to ensure state climate policies are data-driven and accountable by linking their enforcement to timely emissions reporting. This change focuses on transparency, requiring measurable proof that policy costs actually reduce emissions.