|Solar Thermal Electric, Solar Photovoltaics
Massachusetts' interconnection standards apply to all forms of distributed generation (DG), including renewables, and all customers of the state's three investor-owned utilities (Unitil, Eversource, and National Grid).
Massachusetts requires investor-owned utilities to have standard interconnection tariffs. There are three basic paths for interconnection in the state:
If a project fails the Expedited screens, it must pass one or more supplemental review screens, otherwise, it must go through the full standard review process. Massachusetts uses a 100% minimum load penetration screen in the supplemental review process. If the generating capacity is less than 100% of the minimum load, it may not require a detailed study. In addition to these different paths, for all systems 250 kW or greater, facility owners must request and receive a pre-application report from the utility. The pre-application report is optional for facilities less than 250 kW; a $100 fee is charged for this report.
For the simplified and expedited interconnection paths, technical requirements are based on the IEEE 1547 and UL 1741 standards. A manual external disconnect switch may be required at the discretion of the utility (project-specific, not required in the tariffs). Utilities must collect and track information on the interconnection process. This information will be used in revising and updating the standards.
To find out more about Massachusetts' net metering rules click here.