Relating to funding of excess losses and operating expenses of the Texas Windstorm Insurance Association; authorizing an assessment; authorizing a surcharge.

Added new state-funded financing arrangements with $500 million pre-disaster and $1 billion post-disaster limits, replacing the public securities approach for future funding needs.

Modified the effective date structure to create a transition period through December 31, 2025, where public securities remain authorized for losses before that date, while new losses after that date must use financing arrangements.

Added new definitions for 'financing arrangement,' 'financing arrangement administrative expense,' and 'financing arrangement obligation' to clarify the new funding mechanism.

Added requirements for catastrophe surcharges to be collected from insurance policies to repay state financing arrangements, with the total amount limited to what's needed for repayment.

Modified eligibility requirements to include farm mutual insurance companies and surplus lines insurers in the catastrophe surcharge system, expanding the pool of insurers subject to assessments.

Added enforcement provisions allowing writs of mandamus and other legal remedies to ensure compliance with financing arrangement agreements and surcharge collection.