Potassium ion batteries boast high energy density, exceptional ion transport kinetics, and abundant raw material availability. Technology-wise, potassium batteries are relatively new but have already shown great potential for solar energy storage.
Battery storage prices have gone down a lot since 2010. In 2025, they are about $200–$400 per kWh. This is because of new lithium battery chemistries. Different places have different energy storage costs.