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 25 kW or less |
Guidelines |
$200 |
| Fast Track: Residential Inverters greater than 25 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.
Guidelines:
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 25 kW or less, 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 |
0-25 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:
ctdg@eversource.com
What is Hosting Capacity?
Hosting Capacity is the maximum amount of energy from a distributed resource (such as solar panels) it is estimated can be accommodated on the distribution system at a given location. This capacity is under existing grid conditions and operations without requiring significant infrastructure upgrades. This capacity takes into consideration safety, power quality, reliability or other operational criteria.
What is the difference between Location Hosting Capacity and Bulk Substation Hosting Capacity?
The Bulk Station Hosting Capacity is the amount of distribution energy a substation can accommodate, assuming one of the transformers at the substation is offline (either for service or repair).
The Location Hosting Capacity is the amount of distribution energy a circuit can accommodate. This can’t exceed the Bulk Substation Hosting Capacity of the circuit’s substation.
My proposed project is larger than the Hosting Capacity. Does this mean the generation can’t be interconnected?
No. The Hosting Capacity values only reflect the maximum amount of distributed energy that can be interconnected with minimal impact to the distribution system. You can still apply for interconnection in this scenario, however the impact study will determine the scope of upgrades required to interconnect the project.
Does the Hosting Capacity consider power flows from alternate circuits?
No. It assumes the proposed distributed energy will only operate on the circuit in its normal or primary configuration.
How do I know if we have a single phase at the site?
All gray lines on the map are single phase. Colors other than gray on the map indicate hosting capacity on three phase circuits.
There is sufficient capacity on a circuit for my project. Do I still need to submit an application to interconnect?
Yes. An application is still needed to review the project in detail and secure a queue position relative to other applications on the circuit. Depending on the size of the project, a system impact study may still be required.