Bay State startup Beacon Power isn't just another wind / solar / hydroelectric outfit. Oh no, this firm is more concerned with reducing the emissions from the energy plants we already have in place. Put simply, the company's 2,800-pound flywheels are used to store and output energy when needed, a service Beacon's CEO is dubbing "frequency regulation." Essentially, said devices will "match power supply to the grid with power demand from the grid," which curbs energy waste and keeps loads in perfect balance. As it stands, the only disclosed expansion plans include more of Massachusetts and New Hampshire, but if it can rope in enough customers, we reckon the sky's the limit. Video after the jump.