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Connecticut Application to Connect
In this section you will find information about the safe interconnection of generators to the Eversource power system.
Interconnection Application
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).
PowerClerk
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.
PowerClerk Guidelines
To get started, please review the criteria and state guidelines below before clicking the online application link.
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 (PDF) about utility-interactive inverter devices.
Criteria | State Guidelines | Application Fee |
---|---|---|
Residential Inverter-Based Generators 25 kW or less | Guidelines (PDF) | $200 |
Fast Track: Residential Inverters greater than 25 kW; Commercial & Industrial less than or equal to 2 MW | Guideline (PDF) | $500 |
Study Process: Complex projects greater than 2 MW | Guideline (PDF) | $1,000 |
PowerClerk frequently asked questions (PDF) and training guide (PDF) resources are also available.
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
- Residential Inverter-Based Generators 25 kW or less (PDF)
- Generator Interconnection - Fast Track and Study Process Requirements (PDF) for inverter based projects >10 kw and all other non-inverter projects
Please note:
- All work must comply with the Eversource Information & Requirements for Electric Supply Below 600 Volts (PDF).
- Virtual Net Metering offers financial incentives to state, municipal and agricultural customers to encourage the installation of Class I and Class III distributed generation. Submit a Virtual Net Metering Application (PDF).
- A sample interconnection agreement (PDF) and distributed generation project checklist (PDF) can help answer any questions you might have.
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 (PDF), DER Information and Technical Requirements (PDF) and Exhibit B in the Fast Track & Study Process Technical Requirements (PDF) 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)
- Proof of certification under UL1741 and compliance with IEEE C62.41 and C62.45 will be required.
- Refer to Residential Inverter-Based Generators 25 kW or less Guidelines (PDF) for approved inverters.
- Refer to Exhibit B in the Fast Track & Study Process Technical Requirements (PDF).
Important Documents & Links
- Connecticut Hosting Capacity Map
- CT DER Queue (.xlsx download)
- Hosting Capacity Map FAQs
- Connecticut electric tariffs and rules
- Residential Inverter-Based Generators 25 kW or less Guidelines (PDF)
- Guideline: Generator Interconnection; Fast Track and Study Process (PDF)
- DER Information and Technical Requirements (PDF)
- Connecticut Green Bank
- Department of Energy and Environmental Protection (DEEP)
- Information & Requirements for Electric Supply Below 600 Volts (PDF)
Technical Notices
Submit Documentation
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