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Massachusetts System Data Portal

National Grid is dedicated to creating and delivering resources to support developers and contractors across our territories. For our Massachusetts (MA) developers and contractors, we created a MA System Data Portal — an online, interactive collection of maps that provides in-depth visibility into the electric grid distribution system.

The portal contains distribution feeder and substation information, including:

  • Feeder ID and characteristics, such as geographic locations

  • Substation source
  • Planning area

  • Voltage information

  • Loading and available hosting capacity

We encourage you to visit the portal and use the information to develop your future projects.

We are always looking for ways to best support developers and contractors across our territories. We want to hear from you! If you have any engineering questions, comments, or suggestions regarding the Portal, please contact  If you have any help desk or technical support questions, please contact our IMAP team at