POWERTHRU, a subsidiary of Phillips Service Industries, Inc. (PSI), designs and manufactures advanced flywheel energy storage systems that provide ride-through power and voltage stabilization for power quality and recycling applications. The energy-efficient POWERTHRU flywheel is a cost-effective, low-maintenance, environmentally-sound solution that can supplement, or completely eliminate the need for, flooded/wet cell and valve regulated lead-acid (VRLA) batteries in uninterruptible power supply (UPS) systems.