The World’s Largest Sand Battery Is Now Online | OilPrice.com Alex Kimani Alex Kimani is a veteran finance writer, investor, engineer and researcher for Safehaven.com.  More Info Premium Content By Alex Kimani – Jul 28, 2026, 5:00 PM CDT Finland has launched the world's largest commercial sand battery, storing 100 MWh of renewable energy as heat. The system charges using cheap surplus wind and solar power and uses AI to optimize charging and discharging, cutting greenhouse gas emissions by nearly 70%. Sand batteries could become a major long-duration energy storage solution, offering a low-cost alternative to lithium-ion batteries without relying…