🏭CommercialEnergy Storage • Flywheel Storage

Flywheel Energy Storage

Flywheel energy storage systems store kinetic energy in rotating masses spinning at 20,000-50,000 RPM, providing millisecond response times for grid frequency regulation with 85-95% round-trip efficiency. These systems deliver high power output for 15-60 minutes with 20+ year operational lifespans and minimal maintenance requirements. Companies like Beacon Power and Vycon deploy flywheel systems costing $1,000-4,000 per kW for power quality and backup applications.

How It Works

Electric motors accelerate carbon fiber or steel flywheels to high rotational speeds using excess electricity during charging. Energy is stored as rotational kinetic energy in vacuum chambers to minimize air resistance losses. When power is needed, the motor operates as a generator, extracting kinetic energy and converting it to electricity. Advanced magnetic bearings eliminate friction enabling 20+ year operation with minimal maintenance.

Advantages

Provides extremely fast response times for grid stabilization and power quality applications, offers unlimited cycling capability without capacity degradation, and operates reliably across wide temperature ranges. Flywheel systems require minimal maintenance and have no toxic materials. The technology provides both power and energy services with excellent efficiency.

Challenges

Limited energy storage duration of 15-60 minutes restricting applications, high capital costs for energy storage compared to battery systems, and potential safety concerns from high-speed rotating equipment. Complex installations require specialized foundations and safety systems. Limited energy density compared to chemical storage technologies.