Carved into rock beneath the Swedish city of Västerås, a huge man-made cave system is being used to heat local housing ~enviro energy water.hot Article 1057 words 10 votes
Mälarenergi has embarked on a project to fill caverns underneath Västerås, Sweden with hot water – warmth will be sent via heat exchangers to a district heating network ~enviro energy water.hot Article 985 words 3 votes