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 PostsWatch Leia rescue Han in one badass minute in animated 'Star Wars' shortDude's five-year 'Minecraft' game comes to an unfortunate end'Game of Thrones' fans were stunned by the biggest death of the seriesCersei teases aftermath after the battle in eerie 'Game of Thrones' previewLupita Nyong'o breaks down the links between 'Game of Thrones' and 'Us'An actual real-life hero ran the London Marathon dressed as Big Ben