An Act relative to building energy and decarbonization

This bill establishes "green plus communities" for municipalities that meet specific climate action requirements, including creating a 5-year plan to cut building emissions by at least 20% and adopting stricter energy codes. It allocates $40 million for energy programs, with $10 million specifically for green plus communities, and sets annual carbon intensity limits for large buildings that must decrease over time. Building owners must comply with these limits or use approved alternatives like on-site renewable energy, with reduced fees for low-income buildings and small businesses. The bill also creates a retrofit funding program to support deep energy upgrades (excluding fossil fuel conversions) and requires standardized reporting to avoid duplicate data collection.