Interconnection Standards (Connecticut)

From Open Energy Information

Last modified on February 12, 2015.

Rules Regulations Policies Program

Place Connecticut
Name Interconnection Standards
Incentive Type Interconnection
Applicable Sector Commercial, Fed. Government, Industrial, Local Government, Nonprofit, Residential, Schools, State Government, (All Electric Customers)
Eligible Technologies Biomass, CHP/Cogeneration, Fuel Cells, Fuel Cells using Renewable Fuels, Hydroelectric, Landfill Gas, Microturbines, Municipal Solid Waste, Other Distributed Generation Technologies, Photovoltaics, Small Wind, Wind
Active Incentive Yes
Implementing Sector State/Territory
Energy Category Renewable Energy Incentive Programs
Applicable Utilities Investor-owned utilities

External Disconnect Switch Required

Insurance Requirements Vary by system size and/or type; levels established by PUC

Net Metering Required No

Standard Agreement Yes
System Capacity Limit 20 MW

Date added to DSIRE 2004-02-12
Last DSIRE Review 2013-02-21

References DSIRE[1]


In December 2007, the Connecticut Department of Public Utility Control (DPUC) now called the Public Utilities Regulatory Authority (PURA) approved new interconnection guidelines for distributed energy systems up to 20 megawatts (MW) in capacity. Connecticut's interconnection guidelines apply to the state's two investor-owned utilities -- Connecticut Light and Power Company (CL&P) and United Illuminating Company (UI) -- and are modeled on the Federal Energy Regulatory Commission's (FERC) interconnection standards for small generators.*

Connecticut's interconnection guidelines, like FERC's standards, include provisions for three levels of systems:

  • Certified, inverter-based systems no larger than 10 kilowatts (kW) in capacity (application fees: $100);
  • Certified systems no larger than 2 megawatts (MW) in capacity (application fees: $500); and
  • All other systems no larger than 20 MW in capacity. Note that the guidelines include "additional process steps" for generators greater than 5 MW (application fees: $1000, study fees will also apply).

Connecticut's guidelines include a standard interconnection agreement and application fees that vary by system type. However, Connecticut's guidelines are stricter than FERC's standards, differing from the federal standards in several significant ways:

  • Customers are required to install an external disconnect switch and an interconnection transformer.
  • Customers must indemnify their utility against "all causes of action," including personal injury or property damage to third parties.
  • Customers are required to maintain liability insurance in specified amounts based on the system's capacity.
  • In addition, the utilities were required to collaboratively submit to the PURA a status report on the research and development of area network interconnection standards. This report was completed in December 2009, and the PURA has reached a final decision (03-01-15RE02) on the docket. The PURA has determined that the utilities can interconnect inverter-based generators (up to 50 kW) on area networks.

The guidelines address requirements for study fees and include technical screens for each level of interconnection. Utilities and customers must follow general procedural timelines.

* FERC's interconnection standards are applicable to generator interconnections subject to FERC jurisdiction, whereas Connecticut's interconnection guidelines apply to state-jurisdiction interconnections, which typically occur at the distribution level. FERC standards were implemented by ISO-New England (ISO) in ISO Schedule 23, which is applicable to FERC-jurisdictional interconnections.

Incentive Contact

Contact Name General Information
Department Public Utilities Regulatory Authority
Address 10 Franklin Square
Place New Britain, Connecticut
Zip/Postal Code 06051
Phone (860) 827-1553

Contact Name John Buckingham
Department Public Utilities Regulatory Authority
Division Department of Energy and Environmental Protection
Address 10 Franklin Square
Place New Britain, Connecticut
Zip/Postal Code 06051
Phone (860) 827-2891


Authorities (Please contact the if there are any file problems.)

Authority 1: Conn. Gen. Stat. § 16-243a

Authority 2: CT DPUC Decision, Docket No. 03-01-15RE01
Date Effective 2007-12-05
Date Enacted 2007-12-05

  • Incentive and policy data are reviewed and approved by the N.C. Solar Center's DSIRE project staff.[1]


  1. 1.0 1.1  "Database of State Incentives for Renewables and Efficiency (DSIRE)"