Hosting Capacity Map and Interconnection Analysis Portal

Eversource is committed to working toward a clean energy future, and we want to help distributed generation contractors, vendors and solar developers select locations for interconnections to Eversource’s system by providing them with the tools they need.

Hosting Capacity Map

If you are a distributed generation contractor or vendor, you can find optimal locations for interconnections to our system using our Hosting Capacity Map. This map details the hosting capacity by circuit. Each circuit on our system is displayed with a color matching its remaining capacity. Clicking on a circuit will also bring up more detail about the circuit, its remaining capacity and related substation.

This information shows the capacity Eversource’s infrastructure can accommodate, with limited system upgrades, while still reliably and safely delivering electricity to our customers.

Capacity on the circuits and at substations can be increased through project funded upgrades. Small, limited projects may be supported without project funded upgrades.

Answers to frequently asked questions about the hosting capacity map are also available.

Interconnection Analysis Portal for Developers in Massachusetts

Eversource is excited to provide large-scale solar developers in Massachusetts with Gridtwin’s cutting-edge interconnection analysis software, at no cost. If you are looking for your next commercial or ground-mount solar project, this software can be used to:

  • Understand interconnection costs within the Eversource service territory
  • Find suitable land for solar development
  • View Hosting Capacity Maps

The Gridtwin software also enables you to invite colleagues to join so that you can share information and collaborate.

Detailed instructions on creating an account, managing your company’s team and contact information for additional support can be found in our Interconnection Analysis Portal User’s Guide. Additional helpful information on maximizing your experience of the portal can be found in this User Guide and Training Material document.

*If you already have an account on, be sure to enter different log-in information than you use to log-into Your account will be a separate account from your Interconnection Analysis Portal account.