A sand battery in Finland is transforming sustainable heating Ifeadi C. 03:30 Mashable, Zero Tech Blog A city in Finland is using a sand battery to store excess electricity for district heating. via Zero Tech Blog Share this Share on FacebookTweet on TwitterPlus on Google+ Related PostsWant to create professional videos at home? Here are the tools you need.Stephen Colbert loses it over Trump's pointless, personal coronavirus tantrumsSelf employed? This app makes managing invoices a breeze.Tesla to cut salaries, furlough staff amid coronavirus pandemicBuffy comforter review: Fluffy hotel bed energy, but more eco-friendlyNeed a second monitor? This gadget will turn your tablet into one.