Connecticut Application to Connect

In this section you will find information about the safe interconnection of generators to the Eversource power system.

Such interconnections include photovoltaic arrays (solar panels), wind turbines, cogeneration units and micro turbines, to name a few.  All guidelines and fees have been filed and approved by the Connecticut Public Utilities Regulatory Authority (PURA).

Interconnection Application

At Eversource, we're always working to serve you better. With this in mind, our new PowerClerk online application will enable you to more easily initiate new interconnection projects and track them through their full lifecycle.

After logging in securely and filling out the straightforward application form (including e-signing), you'll see the next step in the interconnection process, who is responsible for that step and ultimately be able to select the payment option that is right for you.

To get started, please review the criteria and state guidelines below before clicking the online application form link. Answers to frequently asked questions and an Applicant Training Guide for the PowerClerk application are also available. Effective August 1, 2018, there is a new ISO-NE requirement for those submitting applications to interconnect into Eversource's system in Connecticut. See the ISO-NE Technical Bulletin about utility-interactive inverter devices.

Criteria State Guidelines Application Fee
Residential Inverter-Based Generators 20 kW or less Guideline $200
Fast Track: Residential Inverters greater than 20 kW; Commercial & Industrial less than or equal to 2 MW Guideline $500
Study Process: Complex projects greater than 2 MW Guideline $1,000

Application Descriptions

Per PURA Docket No. 03-01-15 RE02 (Compliance Order No. 1, May 12, 2010 Attachment 1) and PURA Docket No. 03-01-15 RE03 (Guidelines for the Interconnection of Residential Single Phase Certified Inverter-Based Generating Facilities of 20 kW(ac) or Less), Connecticut electric distribution companies “are responsible for the distribution of electric power throughout most of the State of Connecticut. In order to carry out their responsibilities to all customers, each EDC must assure that all Interconnections are made to certain protocols and procedures, which are described in these guidelines.”

Please read the guidelines and technical requirements to understand how your generating system needs to be installed to meet federal, state and local electrical codes.


Please note:

Additional Information

One line electrical schematics

Key elements to illustrate are:

  • The utility voltage at the main panel (three- or single-phase).
  • The fuse symbol and size at the main panel feeding the inverter.
  • The number and location of inverters with the manufacturer's name, the model number, and rating.
  • Indicate circuit connectivity from the main switch, including sub-mains (if applicable), metering, the main switch and the rating of breakers.
  • The location of the isolation device.
  • Title Block that includes but is not limited to, customer's name, address, and revision number of drawing if applicable. Conventional symbols should be used to illustrate the inverters, circuit breakers, switches, fuses, etc. Please refer to the Information & Requirements for Electric Supply Below 600 Volts (PDF).
  • Sample One Line Diagram (PDF)
  • Sample One Line Induction Generator (PDF) 
  • Sample Three Line Diagram (PDF)

Site plan

Key elements:

  • The location of the site structures, metering and transformers.
  • The location of the AC Disconnect Switch with relationship to the Eversource meter.

The EDC requires that the isolation device be visible and in close proximity (10 feet or less) to the main utility panel. It must be clearly identified if the AC Disconnect Switch is not located within 10 feet of the meter. Variances must be approved in writing.

Refer to the Residential Inverter-Based Generators 20 kW or less Guidelines, DER Information and Technical Requirements and Exhibit B in the Fast Track & Study Process Technical Requirements for more information.

Proof of insurance

Key elements:

  • Policy carrier
  • Policy number
  • Policy effective dates
  • Applicable minimum limited liability
Process Rating Time* Application Fees Study Fees Liability Insurance
Inverter Based 0-20 kW 15 $200 0 N/A
Fast Track 0-2 MW 15 $500 0 $300,000 - $2 million
Study Process >2 MW 105-120 $1,000 Actual Cost Based $2 - $5 million

* Please note time is measured in business days.

Liability Insurance

Nameplate Rating* Minimum Liability Insurance Required
Greater than 0 kW to 100 kW $300,000
Greater than 100 kW to 1 MW $1 million
Greater than 1 MW to 5 MW $2 million
Greater than 5 MW $5 million

Technical specification documents (data sheets)

Important Documents & Links

Contact Information

Documentation and fees can be mailed to:

Eversource Energy
Attention: CT Distributed Energy Resources
107 Selden St
Berlin, CT 06037

Documentation can be emailed to: