General Assembly Raised Bill No. 5156 establishes a "climate superfund cost recovery program" under the Department of Energy and Environmental Protection, set to take effect on October 1, 2026. This program aims to collect compensatory payments from "responsible parties"—entities that have emitted over one billion metric tons of greenhouse gases from January 1, 1995, to December 31, 2024. The funds raised will be directed towards climate change adaptive infrastructure projects, such as improving stormwater systems and coastal protections, with a mandate that at least 40% of expenditures benefit environmental justice communities. The bill also outlines the responsibilities of the Department, including creating a public registry of responsible parties and issuing cost recovery demands.

The legislation introduces a structured payment plan for responsible parties, requiring them to pay the total cost recovery demand in nine annual installments, starting with 20% in the first year and 10% in subsequent years. The commissioner can charge interest on late payments and adjust future installments based on the consumer price index. Responsible parties have the right to request reconsideration of demands and appeal decisions to the Superior Court. The climate superfund will be financed through these payments, appropriations from the General Assembly, and donations, with an initial allocation of $300,000 to reimburse the General Fund. The bill emphasizes public engagement and accountability in funding climate resilience initiatives while ensuring the health and welfare of Connecticut residents.