What is Distributed Generation (DG)? This page provides a brief explanation of the DG for first-time visitors.
In Massachusetts, customers interested in interconnecting a DG system to the National Grid's Electric Power System (EPS) must follow the process outlined in the Interconnection Tariff. While all DG customers must ensure their compliance with the Interconnection Tariff, these pages outline the general interconnection process and offer some additional guidance and recommendations.
The Simplified process is for small renewable systems using a single UL1741.1 listed inverter with a system size ≤15kW for single-phase service and ≤25 KW for three-phase electric service.
The Expedited process is available for any DG system that does not qualify for the Simplified process. However, the Standard process is recommended for any non-inverter-based DG systems and large (≥500kW) inverter-based systems.
Complex (Expedited/Standard) Process:
With numerous standards, regulations, and forms related to the DG interconnection process, National Grid has a central location for up-to-date versions of documents and forms for the interconnection process. These documents are updated periodically, so we encourage stakeholders to visit this page regularly.
Find out about eligibility, government regulations, and how bills are determined.
During Open Enrollments, National Grid will be seeking applications to enter into standard contracts for energy, capacity and RECS for eligible renewable energy projects.
To view all MA downtown districts with Secondary Networks
National Grid's most asked about Questions and Answers.
View additional Distributed Generation information.
Notice: Distributed Generation stakeholders with a question about a specific project are strongly encouraged to reference the application number in the email subject line.
Notice: National Grid does not operate or recommend any solar panel installation companies. Any National Grid employee or contractor should have a National Grid ID badge with their photo on it. If someone claims that they are "working for" or "under contract" with National Grid, please notify National Grid immediately via email to: email@example.com. National Grid takes these reports seriously and will contact the company or individual making such claims.