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Maybe in the future more houses will be one that euronews visited in Aarhus, Denmark. Around 50 people are living in revolutionary homes that use energy in a new way. In terms of costs, it means cutting heating bills from over 200 euros a month to less than 50, even if it is very cold.

One tenant, Agnete Dorph-Jensen, explained: "We have solar cells for the lights outside and for the common area and for our laundry. If there were solar cells on the top of the roof, that would be perfect. Then we could save a lot of electricity."