Distributed Generation

What is Distributed Generation?

Distributed Generation involves a generator interconnected to the Electric Distribution System located on either the customer-side or grid-side of the utility meter. The generator produces energy from a variety of sources including but not limited to photovoltaic arrays (solar panels), wind turbines, co-generation units and micro turbines.

UI customers can receive permission to energize and interconnect their Distributed Generation system to the Electric Distribution System by applying via the interconnection process.  UI reviews each interconnection application to ensure that the proposed generator can be safely and reliably interconnected to UI’s Electric Distribution System.

Guidelines for Interconnection

Interconnection guidelines and applications are based on the type of service, generator technology, and the AC nameplate rating of the proposed generator system.

Basic Interconnection

New Effective Date:  June 1, 2018

Key changes:

  1. Application Fee--$200
  2. Evidence of insurance is not required
  3. Voltage screening required

Residential Single Phase Certified Inverter-Based Generating Facilities of 20 kW (AC) or Less

Guidelines: Guidelines include IEEE 1547 (the DER interconnection standard).

Application:



Certified Inverter Based Generating Facilities, 10kW and Less

Expiration Date:  April 30, 2017


Advanced Interconnection

Fast Track & Study Process Generating Facilities
There are two advanced application process categories:  Fast Track Process and Study Process.

Effective Date:  May 12, 2010

1. Fast Track Process
Interconnecting facilities such as induction, synchronous, certified inverter based generators or other generators producing between 20kW -2MW and successfully passes the screen criteria set forth in Section 4.2.1 of Connecticut State Guidelines qualify for the Fast Track Process.

2. Study Process
Interconnecting facilities such as induction, synchronous, certified inverter based generators or other generators producing between 2MW – 20MW or facilities that fail both Fast Track screen criteria and supplemental modifications will require additional (feasibility, facility, and Impact) studies and acceptance of additional modifications to determine interconnection consistent with safety, reliability, and power quality standards.

Guidelines:

Technical Requirements Technical Requirements include IEEE 1547 (the DER interconnection standard).

Application:

Note:  Due to the recent approval of the Guidelines for the Interconnection of Residential Single Phase Certified Inverter-Based Generating Facilities of 20 kW (ac) or Less, Fast Track and Study interconnection applications that are received on or after May 1, 2017 should include only proposed projects that are requested to be interconnected via three phase service and are >20 kW.