Axion Power International Inc. announced that it has received a follow-on purchase order for four more PowerCube energy storage systems from its strategic partner. The Cubes will provide storage for energy created by a commercial solar panel system and service the frequency regulation market on the PJM grid. The purchase order - valued at just north of $1,100,000 - includes batteries, racks, wiring, a data communication system and the electronics coordination needed to outfit and install the PowerCubes.

Each of the PowerCubes will be tied to solar arrays that produce between 500kw and 700kw of power and the PowerCubes will each provide 500kw (both 500kw up and 500kw down) for frequency regulation. Axion's onsite 500kw PowerCube has been connected into the PJM grid utility network, the nation's larger power transmission organization serving more than 58 million people in all or parts of 13 states, for more than 2 1/2 years. Set up as a demand response and frequency regulation asset, the company developed and tweaked a working model in a real world setting utilizing the PowerCube's ability to participate 24/7 in the PJM frequency regulation market.