US-based Qnetic is assembling a 200-kilowatt-hour (kWh) flywheel-based energy storage system dubbed Pulsar, as it is also constructing the world’s largest dedicated flywheel test cell at its Technology Center in Shanghai. The systems are aimed at validating the performance, safety, and reliability of flywheel-based energy storage systems that can replace chemistry-based batteries in the future.
The rise in the adoption of renewable energy technologies has resulted in a peak in demand for energy storage solutions as well. Since renewable energy sources like the sun and the wind cannot be operated on demand and produce energy intermittently, the energy generated needs to be stored till required by the grid.
Large-scale renewable energy plants demand even larger energy storage solutions, which are currently met through the use of lithium-ion batteries. The chemical nature of these batteries makes them expensive at first and also less reliable over the years as their performance drops considerably. In such a scenario, innovators have been looking to replace these batteries with a non-chemical solution that is inexpensive yet works reliably for years.
The case for the flywheel
Flywheel-based energy storage uses rotational motion for energy storage. Inside a vacuum chamber, the flywheel converts excess energy generated by renewable plants into rotational energy. With no friction inside the chamber, the flywheel continues rotating for long periods without energy loss.
To meet energy demand for the grid, the flywheel drives a generator that converts its rotational motion into electricity. Unlike conventional batteries, whose output is dependent on the rate of chemical reactions, flywheels can generate large amounts of power when required or simply do enough to support the grid from collapsing, both equally well with extremely rapid response times.
The system is not prone to thermal runaways and therefore poses no fire risk. More importantly, the performance of the system degrades minimally over the years, ensuring that the storage system can deliver the same output two decades from now as well, making it much more feasible for long-term projects.
Qnetic’s 200 kWh flywheel
New York-headquartered Qnetic is advancing flywheel-based energy storage systems to complement or even replace lithium-ion batteries in the long run. Its 200-kWh system, Pulsar, will help power data centers, support microgrids, and meet other industrial demands.
At its Technology Center in Shanghai, Qnetic has built a test facility where it is assembling its first full-scale Pulsar prototype while also building the world’s largest dedicated flywheel test cell.
Qnetic has teamed up with a firm specializing in spin-test technologies to determine the specifications of the test cell. According to the firm, “In terms of scale, Qnetic’s flywheel system involves significantly more stored energy than what we typically handle in spin testing,” a press release said. “The scale and scope of the containment challenges are therefore quite unique and in a class of their own.”
“Building the world’s largest flywheel test cell while bringing our first Pulsar system into validation demonstrates both the maturity of our technology and our confidence in its commercial potential,” said Michael Pratt, CEO of Qnetic.
“We’re creating the infrastructure needed to prove performance at scale and accelerate deployment for customers. These milestones represent a pivotal moment in Qnetic’s journey from technology development to commercialization.”
