- Active Power
 - Providing flywheel energy storage systems for replacing or augmenting batteries in 3-phase uninterruptible power supplies (UPS). - AFS Trinity
- Develops Fast Energy Storage for vehicular, spacecraft, and stationary power systems that utilize batteries, flywheels, and ultracapacitors.
- Beacon Power Corporation
- Flywheel energy storage systems for the communications industry. Beacon flywheels are environmentally-safe, have long lifespans, and remote monitoring capabilities.
- Creative Science & Research
- Offers diagrams and how-to videos for building free energy engines, heaters, and more.
- Fidanza Flywheel & Performance Parts
- Fidanza specializes in light weight flywheels, clutch kits, cam gears, short shifters, and other performance parts.
- Flywheel Energy Systems Inc.
- Composite flywheels for energy management.
- Regenerative Power & Motion (RPM)
- Site offers pictures and analysis of building-integral and distributed solar/wind power, for buildings and electric highways, enabled by minimal-loss flywheel batteries.
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