world ‘A very Finnish thing’: Big sand battery starts storing wind and solar energy in crushed soapstone euronews Sun 6m read The 15 metres wide battery can store a month's heat demand in summer - how does it work? www.euronews.com Related stories technology Finland warms up the world's largest sand battery, the economics look appealing Hacker News Tue 3m read
technology Finland warms up the world's largest sand battery, the economics look appealing Hacker News Tue 3m read
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