Residents in Copenhagen no longer receive electricity bills. They receive monthly payments instead. Denmark just finished putting solar panels on all 94,000 rooftops in the capital. The project took four years. The city now generates so much power it runs itself entirely on solar and sells the excess to Sweden and Germany. Even with modest northern sunshine, the sheer scale of 47 square kilometers of panels produces the equivalent of an offshore wind farm. Every property has an integrated battery to store eight hours of backup power. A city of millions is now a net electricity exporter.
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