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Massachusetts Interconnection Standards

Date Last Updated8/13/2014
Policy TypeInterconnection Standard
State/FederalMA
Policy Administrator/Contact OfficeMassachusetts Department of Public Utilities (DPU)
Policy Initiation Date2/16/2007
Policy SummaryMassachusetts's interconnection standards apply to all forms of distributed generation (DG), including CHP, served by the state's four investor-owned utilities (Unitil, NSTAR, National Grid, and Western Massachusetts Electric Company). The Model Interconnection Tariff includes provisions for three levels of interconnection.
  • The Simplified interconnection process applies to IEEE 1547.1-certified, inverter-based facilities with either 1) a power rating of up to 15 kW for single-phase systems located on radial EPSs under certain conditions; 2) a power rating of up to 25 kW for three-phase systems (depending on system configuration), located on radial EPSs under certain conditions; 3) a power rating of less than 1/15 of the customer's minimum load and located on a spot network EPS; or 4) a power rating of less than 1/15 of the customer's minimum load and 15 kW or less and located on an areas network EPS with a rating of less than 1/15 of the customer's minimum load and 15 kW or less. There are no fees associated with the simplified interconnection process.
  • Expedited interconnection applies to certified, inverter-based, single-phase systems up to 10 kW and certified, three-phase systems up to 25 kW, served by radial systems. Under the expedited interconnection procedures, the maximum time allowed for the utility to execute the entire Expedited Process on a radial system is 40 days where no Supplemental Review is needed and 60 days where it is needed. Application fees are based on the size of the system.
  • Standard interconnection applies to all systems not eligible for simplified or expedited interconnection, and all systems on area networks. The maximum time allowed for the utility to execute the entire Standard Process is 125 days if the customer goes directly to Standard Review and 150 days if the customer goes from the Expedited Process into Standard Review. Application fees are based on the size of the system.
The technical requirements for all systems are based on the IEEE 1547 and UL 1741 standards. A manual external disconnect switch may be required at the discretion of the utility.
CHP Eligibility RequirementsBoth fossil-fueled and renewably-fueled CHP systems are eligible for standardized interconnection.
Eligible Project Size (MW)All sizes are eligible.
Applicable FormsApplicable forms and more information can be accessed on the Massachusetts DG and Interconnection Main Page.
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