This New Underground Energy Storage System Supports Wind And Solar Power
cleantechnica.com Jul 25, 2026

This New Underground Energy Storage System Supports Wind And Solar Power

AI-summarised brief · reviewed before publication

Startup Qnetic is advancing its Pulsar flywheel energy storage system to support wind and solar power, targeting up to 12 hours of long-duration storage. While pumped hydropower dominates the US market, its geographic limitations create opportunities for alternatives like flywheels, which store energy kinetically rather than chemically. Qnetic, with headquarters in the US and China, is constructing a dedicated testing facility in Shanghai to validate the system’s performance and safety. The company claims its technology offers lower lifecycle costs and reduced fire risks compared to lithium-ion batteries. Excavation for the test cell is underway, alongside development of a 200 kilowatt-hour prototype. Qnetic aims to manufacture the final system in the US, seeking to mitigate supply chain risks associated with critical materials. The project has received validation support from the Electric Power Research Institute, positioning flywheels as a viable competitor in the expanding long-duration energy storage sector.

💡 Why It Matters

  • · Kinetic storage bypasses the material constraints and safety hazards inherent in chemical batteries.
  • · This technological shift offers grid operators a durable, rapid-response alternative that does not rely on scarce critical minerals.