SB 2393 creates an exemption from ad valorem taxation for the increased appraised value of real property resulting from the installation of an electric generator primarily used for on-site energy production. The bill defines eligible generators as those powered by natural gas, diesel, biodiesel, or hydrogen and that are fully enclosed in sound-attenuating enclosures. The exemption applies only to tax years beginning on or after the bill’s effective date and requires approval of a corresponding constitutional amendment by voters​.