HB 5590

This bill creates a special exemption for advanced nuclear reactors from certain transmission interconnection cost requirements in the ERCOT system (Texas's primary electric grid). Specifically, it exempts advanced nuclear reactors—defined as fission-based reactors in three size categories ranging from microreactors (less than 50 megawatts) to large reactors (600-1600 megawatts)—from having to pay costs that exceed the transmission-owning utility's allowance for connecting to the grid. While typically generation resources must directly pay for any interconnection costs above the utility's allowance, this bill removes that requirement for advanced nuclear facilities, potentially reducing a significant financial barrier to nuclear power development in Texas. The law would take effect September 1, 2025.