Deep beneath Vantaa, Finland, waste heat from the summer will be stored until winter, when the rock becomes a giant thermos. “This cave is absolutely enormous, it holds 1 million cubic meters,” says Juha Luomala at Vantaan Energia.
Deep beneath Vantaa, Finland, waste heat from the summer will be stored until winter, when the rock becomes a giant thermos. “This cave is absolutely enormous, it holds 1 million cubic meters,” says Juha Luomala at Vantaan Energia.