Interconnection puts renewable energy generation in your hands.
Customers who generate more electricity than they need can push that electricity back out through their meters as a surplus.
Interested in installing a renewable energy system on your property? The interconnection process doesn’t have to be complicated. In six easy steps, you can complete, submit and finalize your application to enjoy the benefits of renewable energy generation.
To make the interconnection process easier, Unitil has an online application system that will determine which application is right for you. Familiarize yourself with the information on this page before beginning the application process.
If you’d like to send your application in writing, please mail it to:
Unitil
Attn. Generator Interconnections
6 Liberty Lane West
Hampton, NH 03842

6 Steps to Easy Interconnection
Read through the steps below to understand the full process and when you are ready, you can start or resume your online application here. Throughout your application process, you will be asked to submit supporting documentation when necessary. Please submit all completed documents through our Documentation Upload Portal.
Here are a few things you and your contractor should know:
Step 1: Begin your application process
An incomplete or incorrect application can delay requests, so be sure to fill out your application thoroughly and accurately. Begin your application process here.
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. Upload your documents securely here.
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. There is no fee required for processing of the Standard Application. Mail checks to:
Unitil
ATTN: Generator Interconnection
6 Liberty Lane West
Hampton, NH 03842
Step 2: Upload any necessary supporting documents
You can upload documents securely using our customer generation Documentation Upload 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.
Step 3: Confirm installation approval
Upon receipt of installation approval, share this update with your vendor or installer for smooth implementation.
Step 4: Submit photos of installation
Once the generator is installed, return to the Documentation Upload Portal to submit documentation of installation and the Certificate of Completion signed by the local municipal writing inspector.
Step 5: Unitil installs meters
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.
Step 6: Start to see savings
Use this approval to qualify for state and federal rebates to fully receive the benefits of renewable energy generation. Your monthly bill will include an “Other Credits” 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.
Requirements You Should Know
For a safe and efficient interconnection process, Unitil complies with requirements specified by the New England Independent System Operator (ISONE) and state agencies. To learn more about these requirements, and to discover if interconnection is right for you, check out the links below.
- ISO New England Source Requirements
- Schedule IC (Massachusetts only)
- UES 100 kVA Interconnect Standard (New Hampshire only)
- Unitil Guideline for Interconnecting Distributed Generation (GL-DT-TC-10)
- Unitil Metering Requirements
Resources for Successful Interconnection
State-Specific Resources
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Massachusetts | |
New Hampshire |
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Need Additional Help?
- Reach out to Unitil experts at generator@unitil.com or call us at 603-773-6480 to discuss your project further.
- Research your installation company. The Department of Public Utilities (Massachusetts customers) and the Public Utilities Commission (New Hampshire customers) are good resources for interconnection and net metering questions, and to confirm the legitimacy of a business.
- Get an electrical permit from your town. You may be required to obtain a building permit before or in addition to an electrical permit. Please contact your town or city hall for information.
Save the Planet, Save Money
Renewable energy isn’t just good for the environment — through interconnection, it’s good for your wallet, too. Check out these blogs to learn more about this green initiative.