Personal property taxation; classifications; major energy consumer equipment upgrades. Establishes a special classification for generating equipment purchased on and after July 1, 2026, for the purpose of upgrading the backup or standby power systems of a major energy consumer (i) from equipment that does not meet Tier 2 emission standards to selective catalytic reduction generators that meet or exceed Tier 4 emission standards or (ii) to meet New Source Performance Standards as enforced by the Department of Environmental Quality, as applicable. The bill provides that such equipment may be taxed at a lower rate than is applied to other tangible personal property.