At the heart of Echogen’s PTES system is a simple idea done right: use proven thermodynamics to store massive amounts of energy as heat, then turn it back into electricity with precision turbomachinery. We use supercritical CO₂ in a closed loop, not because it sounds impressive, but because it works better. It handles heat efficiently, operates safely at moderate temperatures, and lets us build systems with off-the-shelf materials that last for decades. Our engineers have spent years pressure-testing every component, tuning every cycle, and cutting out what doesn’t serve performance. The result? A practical, scalable alternative to batteries that delivers when and where the grid needs it. When it comes to the future of storage, theory’s not enough. You’ve got to prove it.
The system can cycle as often as needed with no degradation, using robust turbomachinery and materials that last for decades. It offers electricity-in, electricity-out operation.
PTES uses common, benign materials like water and concrete and operates with CO₂ in a closed loop. No rare earths, fire risks, or exotic supply chains.
sCO₂ behaves like a liquid at room temperature and like a gas at higher temperatures to improve cycle performance at safe, low-cost reservoir temperatures and enable effective heat transfer. CO₂ is a low-cost, environmentally friendly fluid.
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