Last month, Finnish startup Polar Night Energy announced that it is building a giant sand battery capable of heating a town of 5,000 people for up to a month. That’s on a single charge.

Finland’s Polar Night Energy has secured €7.6 million ($8.2 million) in seed funding. The startup, known for its thermal energy sand-based storage systems, says the investment will be used for ...

Finnish startup Polar Night Energy has announced a new pilot project that will test the next generation of its sand battery technology. The sand battery pilot plant will build on the company’s ...