The leaders of Germany, Belgium, Denmark and the Netherlands announced plans to quadruple their offshore wind power capacity to 65 gigawatts by 2030 at a summit held in the Danish coast town of Esbjerg.
The move comes as European governments are redoubling their efforts to reduce their dependency on Russian fossil fuels in the light of Moscow's invasion of Kiev.
"This is not just a declaration, but the toolbox for what we have to do and will do in the near future," said German Chancellor Olaf Scholz as he signed the agreement.
The leaders of all four countries were joined by European Commission chief Ursula von der Leyen to discuss how best to strengthen the European renewable energy market.
The Danish, German, Dutch and Belgian leaders also agreed to further expand wind energy output to 150 gigawatts by 2050, a goal ten times higher than current targets.
German Economy Minister Robert Habeck welcomed the move, as a way of reducing Europe's dependence on gas imports.
Germany, long dependent on Russian energy sources, is particularly keen to find alternatives, as Moscow's war continues on Ukraine.
Scholz also called for greater use of wind power to generate electricity, saying power could be produced cheaply on a large scale through offshore wind farms.
Scholz also called for hasty action. "We have to be brave ... This is not a job for the future. It's a job for today," he said, adding that now was the time to invest billions in expanding wind farms, and called for faster approval processes.
German offshore wind farms are to increase their output from 7.8 gigawatts to at least 30 gigawatts by 2030, when Berlin hopes renewables will supply 80% of Germany's electricity, according to recent proposals.
Beyond the wind target, the four states also agreed to work more closely together on producing green hydrogen from offshore wind energy and on establishing joint energy hubs in the North Sea.
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