PowerCorp - Markets PowerStore flywheel system. Beacon Power - Makes 2 and 6 kilowatt-hour flywheel (kinetic-electric) energy storage units. RPM's Flywheel Battery - Flywheel battery described as having near-zero storage (idling) loss, unlimited service life with no maintenance, ultra-high power conversion efficiency. Flywheel Theory - Basics of flywheel energy storage, with links to many other sites. Tribology Systems, Inc. - Solid-lubricated bearing technology. Operational speeds can range up to 500,000 RPM, with temperatures up to 1000 F. Links to flywheel battery information. Flywheel energy storage - Wikipedia - article includes equation for kinetic energy Pentadyne Selected as ``Most Promising Company'' - at Energy Venture Fair V. Flywheel maker lauded. Motor Generator - Brushless DC Motor - on motor types for high speed flywheel energy storage. ASPES Engineering AG - Graphic comparisons of power, rotor speed, and energy. Bibliography includes English and German titles.