Rockland sold its interests in Beacon Power, LLC (“Beacon”) in April 2018.

Beacon, located in Tyngsboro, MA, is a global leader in the development and commercialization of flywheel-based energy storage solutions for grid-scale frequency regulation services and other energy storage applications. Beacon’s advanced flywheel technology stores and recycles energy on a highly efficient, emissions-free basis to provide more effective frequency regulation and energy balancing services for the electric grid.

As a result of their extremely fast speed of response, flywheels can address and correct frequency deviations more effectively than conventional regulation methods, at a lower cost of operation. The use of this technology reduces the usage of fossil fuel to provide regulation services and makes it easier for the grid to integrate intermittent renewable energy sources, such as wind and solar power, whose variability increases the amount of regulation needed.

Rockland acquired the assets of Beacon in March 2012 through a bankruptcy proceeding. For more information, please visit

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