| ASPES Engineering AG – Graphic comparisons of power, rotor speed, and energy. Bibliography includes English and German titles. |
| Beacon Power – Makes 2 and 6 kilowatt-hour flywheel (kinetic-electric) energy storage units. |
| FAQ: Kinetic Energy Storage – ASPES Engineering AG site with technical information and theory on flywheels and design. Photos of failures. |
| Flywheel energy storage – Wikipedia – article includes equation for kinetic energy |
| Flywheel Energy Systems, Inc. – Private corporation to "bring flywheel technology to the marketplace" Rotors, testing, and systems. |
| Flywheel Theory – Basics of flywheel energy storage, with links to many other sites. |
| Flywheels – Technical paper and information on exotic bearings for flywheels. |
| Flywheels channel at Power Design 365 – articles, product information and vendors |
| Motor Generator – Brushless DC Motor – on motor types for high speed flywheel energy storage. |
| PowerCorp – Markets PowerStore flywheel system. |
| Regenerative Power and Motion: A Low-Loss Flywheel Battery – technology and applications of stationary model. |
| 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. |
| 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. |
| Pentadyne Selected as “Most Promising Company” – at Energy Venture Fair V. Flywheel maker lauded. (November 22, 2004) |
| Liebert FS Advanced Flywheel Energy Storage System – Emerson Network Power announcement of new product. (October 13, 2004) |
