ESBJERG PORT, Denmark (Reuters) -Germany, Belgium, the Netherlands and Denmark on Wednesday pledged to build at least 150 gigawatts (GW) of offshore wind capacity in the North Sea by 2050 to create a “green power plant” for Europe. But the task will be challenging as the European wind supply chain is struggling to make money and the pace of build-outs is being slowed by long permitting times. Some 150 GW would be enough to power 230 million European homes but the ambition is also to use the green power to make hydrogen and green fuels for heavy industries and transportation which cannot easily…