Requiring the installation of solar energy systems on new school buildings.

SB 5546 requires public schools in Washington to install solar energy systems on new buildings exceeding 50,000 square feet. Schools planning construction starting June 1, 2025, must notify the state superintendent about solar feasibility and costs, with full installation required before occupancy for projects starting after June 1, 2028. The bill creates a state grant program to reimburse schools for solar installation costs, but only for projects demonstrating a positive 25-year cost-benefit analysis. This directly affects public school districts constructing large new buildings, aiming to reduce energy costs and emissions through mandatory solar adoption.