HD 4121 Massachusetts House · 194th Legislature (2025-2026)

An Act establishing solar neighborhoods

This bill requires new residential and commercial buildings to install solar energy systems. It specifically mandates that detached single-family homes generate at least 80% of their annual electricity needs through solar, while multi-family buildings and commercial structures up to six stories must include both solar systems and battery storage. Developers can seek exemptions for reasons like insufficient roof space, community solar participation, or affordable housing projects. The law also sets requirements for building design to support solar installations and imposes penalties for non-compliance.
Bill status Introduction 0 of 4 stages cleared
Introduction
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Governor