Steps to Interconnection

An incomplete or incorrect application can delay requests, so be sure to fill out your application thoroughly and accurately.

Start by finding your desired address on your state's Interconnection Hosting Capacity Map.

Then, use the Interconnection Program Portal to create a new account or sign in to an existing account. You may submit multiple applications under one account and you will be able to save and edit your progress of each application up until it's successfully submitted.

For Massachusetts customers

For Massachusetts 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. In addition to the Interconnection Application, an eligible customer must complete and submit Schedule Z in order to be considered for Net Metering. If you are seeking to allot your credits to other Unitil accounts, please download the following spreadsheet, fill it out completely and return it as a workable Excel spreadsheet.

• Download Schedule Z Net Metering Allocation Spreadsheet (Excel)
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For New Hampshire customers

For New Hampshire customer systems with power ratings up to 100 kVA, we will direct you to the Simplified Application. For customer systems greater than 100 kVA, you will be directed to the Pre-Application Form. Please include payment of $500 for processing of the Pre-Application. After submission, you will need to return to fill out the Standard Application. 

Mail checks to:

Unitil
ATTN: Generator Interconnection
30 Energy Way
Exeter, NH 03833

You can upload documents securely within your Interconnection Program Portal. 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 Massachusetts customers

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 fifteen business days after the application is considered complete. For larger systems, please contact Unitil at 1-888-301-7700 to discuss your project.

• Exhibit H (Retail Customer Agreement)

For New Hampshire customers

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 ten business days after the application is considered complete. For larger systems, please contact Unitil at 1-888-301-7700 to discuss your project.

Upon receipt of installation approval, share this update with your vendor or installer for smooth implementation.

Once the generator is installed, return to your Interconnection Program Portal to submit documentation of installation and the Certificate of Completion signed by the local municipal writing inspector.

Upon receipt of the signed Certificate of Completion, Unitil will notify you of any additional certification documents or witness test requirements. Once these are met, Unitil will install the appropriate meter(s) and notify you with approval to use your new generating system.

Use this approval to qualify for state and federal rebates to fully receive the benefits of renewable energy generation. Your monthly bill will include a “Net Meter Credit” line item if the system produced more electricity than was used during that billing period. If the system did not generate excess energy beyond monthly consumption, your bill will not include this line item.