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Requirements for Interconnections

Unitil must comply to requirements specified by the New England Independent System Operator (ISO-NE).  The requirements below are for all inverter-based generating units interconnecting with any electric distribution or transmission system in New England.

ISO New England Source Requirements

 

6 Steps to Interconnection

Before installing your own renewable energy system, we’d like to help you determine which application is right for you. To make the interconnection process easier, Unitil has streamlined the application process. Please submit all completed documents during the application process through our secure portal at https://dgapplication.unitil.com.

Here are a few things you and your contractor should know:

 
Step 1:

Read the instructions and fill out the appropriate application. An incomplete application can delay your request.

For customers connecting to radial electric power systems with power ratings up to 15 kW single-phase or up to 25 kW three-phase, or connecting to an area or spot network with a power rating of up to 15 kW single-phase, please review the instructions below and submit an application. View all applications HERE.
For customer systems with power ratings up to 100 kVA, please submit the Simplified Application. For customer systems greater than 100 kVA, please submit a Pre-Application Form. Please include payment of $500 for processing of the Pre-Application. After submittal, you'll need to fill out the Standard Application. There is no fee required for processing of the Standard Application. View application process documents HERE.

 
Step 2:

Upload your application and neccessary attachments securely at https://dgapplication.unitil.com or drop it in the mail (our addresses are listed below). A Unitil representative will get back to the applicant within three business days with receipt of your paperwork. Within ten business days, a Unitil representative will respond to let the applicant know if the application is complete, or if there are required steps needed to complete your application. For single phase systems up to 15 kW or three-phase systems up to 25 kW, Unitil will notify the applicant of the approval to install, or any system modifications required to allow for the installation within tenfifteen business days after the application is considered complete. For larger systems, please contact Unitil to discuss your project.


 
Step 3:

Once the applicant has received installation approval from Unitil, be sure to share this information with the vendor or installer.


 
Step 4:

Once the generator is installed, Unitil will provide the applicant with a Certificate of Completion that must be returned to our office, signed by the local municipal wiring inspector.


 
Step 5:

After receipt of the applicant's signed Certificate of Completion, Unitil will notify the applicant of certification documents or witness test requirements. Once these requirements are met, Unitil will replace the standard meter with a net meter. At this point, the applicant will be notified of approval to use the generating system.


 
Step 6:

Use this approval form to qualify for state and federal rebates and enjoy the benefits of renewable generation! A monthly bill will show an “Other Credits” line item, listed near the bottom if the system generated more electricity than was used in that billing period. If the system did not generate excess energy (more than the monthly consumption), the customer will not see this credit.


 

Applications

Before installing your own renewable energy system, read the instructions and fill out the appropriate application.

 

Tips & Resources

View tips and resources on how to streamline the process of interconnection.

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