New Sand Battery Pilot Aims to Convert Heat Back to Electricity in Valkeakoski A collaboration between Polar Night Energy and Valkeakosken Energia will soon bring a next-generation Sand Battery pilot plant to Valkeakoski, Finland. This pilot will test something new: the ability to convert stored thermal energy back into electricity, a process called Power-to-Heat-to-Power (P2H2P). Construction begins autumn 2025. The Sand Battery stores cheap, clean electricity as heat. Current versions only deliver this stored energy as heat for industrial or district heating needs. The new pilot aims to complete the cycle by generating electricity from that stored heat. This isn’t … Continue reading €4.2M Sand Battery Pilot in Valkeakoski Tests Heat-to-Power Tech That Cuts CO₂ by 70%