Relating to the authority of the Texas Department of Insurance to adopt rules that implement or are based on certain environmental, social, and governance models, ratings, or standards.

HB 3899 prevents the Texas Department of Insurance (TDI) from requiring insurers to comply with environmental, social, and governance (ESG) standards - such as those measuring climate risk, labor practices, or product safety - unless the legislature has explicitly authorized it. The bill amends the Insurance Code to add Section 36.008, prohibiting TDI from enforcing ESG-based rules or standards (including those from the National Association of Insurance Commissioners) without specific statutory permission. It defines key terms like "environmental assessment" (climate change exposure) and "social assessment" (labor practices and product safety) to clarify the scope of prohibited requirements. This directly affects Texas insurance companies by limiting TDI’s ability to impose new ESG-related regulations without legislative approval.