Due to the expansion of legal protection and the implementation of new safety regulations, the development and construction of Massachusetts Battery Energy Storage Systems (BESS) have become more feasible. Energy storage is known as the 'Swiss Army Knife' because it can achieve a wide range of applications, including peak shaving, grid stability, and distributed generation grid integration. Despite the multifunctionality and growing energy demand of BESS, its development still faces significant obstacles. Local safety issues and inconsistent municipal permit procedures often delay or hinder projects. Despite these challenges, energy storage remains crucial for the Commonwealth's clean energy transition, with the 2024 Clean Energy Act calling for 5000 megawatt hours of energy storage to be achieved by 2030.

A major turning point in the development of BESS occurred in the 2025 decision of the Massachusetts Land Court regarding the Daksbury energy storage project. The case argues that federal "solar power supply" applies to independent BESS systems. Solar energy supply regulations:

No zoning regulations or bylaws shall prohibit or unreasonably regulate the installation of solar energy systems or promote the construction of structures for solar energy collection, unless necessary to protect public health, safety, or welfare.

The court's reasoning is that the legislative body intends to promote solar power generation through solar energy supply, and the regulation explicitly includes structures that support or promote the use of solar energy, including the construction of independent BESS facilities. The court rejected the argument that BESS facilities must only store solar power to meet the protection conditions of the Dover Amendment Solar Energy Clause, expanded the protection scope to such storage systems, and further argued that the BESS structure meets the meaning of the Solar Energy Clause. Therefore, municipal authorities cannot prohibit or unreasonably regulate such systems. Duxbury's ruling is consistent with Massachusetts' long-standing precedents in supporting renewable energy infrastructure, including Tracer Lane II Realty, LLC v. Waltham, where the Supreme Court held that restricting solar energy development without a reasonable purpose to protect public health, safety, or welfare violates the solar energy provisions of the Dover Amendment.

In the past few years, applying for permits instead of installation has been a real obstacle to the development of BESS. Duxbury eliminated one level of complexity by forcing the municipal authorities to make BESS requirements essentially the same as solar energy. After the summer of 2025, Massachusetts has been working together to standardize the licensing procedures for all BESS systems. This takes the form of new zoning regulations, which explicitly mention cases such as Duxbury and Tracer Lane, providing a framework for municipal authorities to clarify which restrictions are no longer appropriate and better set expectations for developers.

Although Duxbury's decision clarified the statutory protection scope of the BESS project and reduced restrictive local zoning, many municipal authorities continue to focus on safety and operational risks when evaluating proposed facilities; Concerns about these risks, like zoning considerations, strongly influence local decision-making. However, the modernization of engineering and fire safety standards for energy storage has greatly weakened the argument that BESS facilities pose a public safety hazard. Understanding how current standards address and mitigate risks is crucial for comprehending the current framework for reviewing and allowing BESS projects in Massachusetts.

The nationally recognized safety standards and tests, including NFPA 855 and UL 9540A, now provide a framework for system design and operation. Although the risk of fire has not been eliminated, these safety standards greatly reduce the likelihood and severity of heat events.

The study by the American Clean Energy Association on 35 recorded BESS fire incidents in 2025 found that the majority of BESS fires occurred in old systems built before the adoption of current standards. This study emphasizes that the impact of such events on the environment is limited, "the emissions in the air are short-lived and localized, the risk of soil and water pollution is minimal, and existing firefighting strategies further mitigate potential environmental hazards

Of course, BESS approval always comes with some additional security requirements. Developers in Massachusetts should pay attention to NFPA 855 in 2020, not only because it is the latest safety regulation regarding BESS, but also because its content has been reproduced in the Massachusetts Fire Code. The threshold for approving the BESS system is still high, but at least now it is clear where it is.

Massachusetts' ambitious clean energy goals establish BESS technology as a key and cost-effective component for integrating renewable energy generation and ensuring grid reliability. Stronger legal protections, licensing reforms, and higher safety standards have created a more predictable development and licensing environment for BESS developers, driving the growth of battery storage projects across the Commonwealth.

Developers entering this market still have to deal with complex zoning frameworks, constantly changing fire safety requirements, and licensing challenges for specific projects.