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
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 in Mustikkamaa were filled with 260,000 cubic metres of hot water, creating a giant “heat battery” to balance consumption peaks throughout the…