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| Copenhagen |
Copenhagen has just pulled off something that would’ve sounded like a pipe dream not long ago: it’s now the first capital city on the planet running entirely on offshore wind. Every last home, business, hospital, and even the streetlights are powered by electricity spun up by turbines out in the North Sea—no fossil fuels in the mix, not even a drop.
This milestone came as Ørsted’s Horns Rev 4 wind farm finally hit full throttle, feeding its promised 1,800 megawatts straight into the city’s grid. Stack that on top of Horns Rev 1, 2, and 3, and you’re looking at a combined offshore capacity of 3,400 megawatts—comfortably overshooting Copenhagen’s peak demand of 2,900 megawatts, even when winter bites the hardest. And here’s where it gets clever: when there’s more power than the city can chew through, the surplus doesn’t go to waste—it’s funneled into massive heat pumps that warm up the district heating system in advance, effectively socking energy away for a rainy (or freezing) day.
Grid operators confirmed that Copenhagen didn’t burn a single unit of fossil-fuel electricity for 847 hours straight across November and December 2024—right through the holiday season, when demand typically goes through the roof. During that stretch, offshore wind farms churned out 1.4 terawatt-hours of electricity, with emissions at a mere 4 grams of CO₂ per kilowatt-hour—a far cry from the European average of 296 grams.
Zoom out, and the bigger picture is just as striking: over the past decade, Copenhagen has slashed its per-capita electricity emissions by 94%. That puts it miles ahead of the pack—the lowest-carbon capital in the developed world—and the first to hit a verified 100% renewable electricity supply from a single source. Not bad for a city that decided to go all in and let the wind do the heavy lifting.
References:
1. ENS_DK (retrieved 2026-09-05)
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