An act relating to substantial change to a net metering system

H 599 simplifies modifications to small solar energy systems by removing the need for new permits if capacity stays under 25 kW. It directly affects Vermont homeowners and small businesses with existing solar installations who want to make minor upgrades (like adding panels) without seeking additional approval. The bill amends Vermont law to state that only changes exceeding 25 kW capacity require a revised "certificate of public good." This reduces administrative steps for small system adjustments while maintaining oversight for larger expansions. The change takes effect July 1, 2026.