Beacon Power's flywheel energy matrix is currently in development and it does not expect to recognize commercial revenues from flywheel sales until late 2008/2009 . It has successfully gained ISO certification, which is a precursor to selling the device to utilities, in California and New York.
The passing of Massachusetts' energy bill which recognizes flywheels as a commercially acceptable option for providing frequency regulation. It allows for 13 megawatts of alternative frequency regulation technologies to be connected to the grid. This is a significant development for Beacon Power as it readies the production of its first commercially viable flywheel.
The firm is in the process of constructing their 4th generation flywheel, called their Smart Energy Matrix. The Smart Energy Matrix is a multi-flywheel system capable of providing up to 25kWH of frequency regulation.
Flywheel Energy Storage (FES) works by accelerating a rotor (flywheel) to a very high speed and maintaining the energy in the system as rotational energy. The energy is converted back by slowing down the flywheel.