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Distribution Generation Requirements

Distributed generation (DG) systems are typically small-scale power generation technologies installed by customers and used to provide an alternative to or an enhancement of the traditional electric power system. Examples of DG include solar panels, wind turbines and cogeneration units to name a few.

If you’re considering installing generation, you must adhere to the Standards for Interconnecting Distributed Generation tariff (PDF:523KB).

In accordance with the tariff, the interconnecting customer should consult WMECo before designing, purchasing or installing any generation equipment in order to verify the voltage and phase characteristics of a customer’s service and the characteristics of WMECo’s distribution system that the customer is fed from. Customers proposing to install a generation facility 500 kW or greater are required to request a Pre-Application Report by submitting a Pre-Application request (PDF:25KB).

Customers must submit an application and receive approval prior to installing distributed generation. Depending on the size of the proposed DG system, approvals can take three weeks to several months.

If your project is 1 megawatt (MW) or larger, ISO-New England approval is also required. This will add approximately two to six months to the application process.

See a summary of requirements for distributed generation (PDF:23KB).

The size and type of the proposed DG system will determine which application process a customer should follow for electrical interconnection.

You will follow the simplified process and use the Simplified application (PDF:219KB) if you intend to install:

  • A single phase Listed inverter-based system that is 15 kW or less on a single phase service fed from a radial circuit, or
  • A three phase Listed inverter-based system that is 25 kW or less on a three phase service fed from a radial circuit, or
  • A Listed inverter-based system less than 1/15th of customer’s minimum load and fed from a spot network, or
  • A Listed inverter-based system that is 15 kW or less and less than 1/15th of the customer’s minimum load and fed from an area network

You will follow the expedited process and use the Expedited/Standard application (PDF:190KB) if you intend to install:

  • A system that is greater than 15 kW single phase, or greater than 25 kW three phase, or
  • Your system configuration does not correspond with the service configuration; and
  • Your proposed generation equipment must meet IEEE 1547.1 standards; and
  • You must be on a radial distribution circuit

You will follow the standard process or standard process complex and use the Expedited/Standard application (PDF:190KB) if you intend to install:

  • A non-inverter based generator, co-generator, wind, hydro or other facility; and
  • For all facilities not qualifying for the simplified or expedited process

If you are installing distributed generation, or already have a generator, you may be eligible for net metering, a method of measuring the energy consumed and produced by a customer’s generating facility. If you are a customer applying for electrical interconnection, and you want to be considered for net metering, you must also submit the net metering application (PDF:116KB).

Applications and documentation should be mailed to:
Western Massachusetts Electric Company
Attention: WMECo DG
55 Russell Street
Hadley, MA 01035-9455

View the most recent presentation given at the DG Interconnection Seminar (PDF:3.0MB).

For more information, or if you have questions, please e-mail wmecodg@nu.com or call the DG and Net Metering Information Line at (413) 787-1087.

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