Aquion Energy is a Pittsburgh-based company that manufactures sodium ion batteries and energy storage systems. The company claims to provide a low-cost way to store large amounts of energy (e.g. for an electricity grid) through thousands of battery cycles, and a non-toxic end product made from widely available material inputs and which operates safely and reliably across a wide range of temperatures and operating environments. An individual battery stack was expected to store 1.5 kWh, a pallet-sized unit 180 kWh and a shipping-container-size box holds 2.88 MWh. The battery cannot overheat.