Helsinki turned abandoned 1970s oil caverns into a giant underground heat battery holding 260,000 cubic metres of hot water; it can heat 25,000 homes for a year
Rest of World News: In a groundbreaking move toward carbon neutrality, Helsinki has transformed two abandoned underground oil caverns into Finland’s largest heat storage .
Helsinki (Representative image) In a groundbreaking move toward carbon neutrality, Helsinki has transformed two abandoned underground oil caverns into Finland’s largest heat storage facility. According to Helen, the city’s energy company, the caverns... [4723 chars]