At the end of 2017, the UK had 1,762 fully commissioned turbines operating in its waters, following the addition of 372 machines in the 12-month period.
A further 1,161 turbines have either been installed, or are in the process of being installed, the seabed landlord, the Crown Estate said in its Offshore Wind Operational Report.
"The resounding theme for 2017 was construction, construction, construction, with it being the UK's busiest year yet in offshore wind," the report said.
The UK's offshore wind fleet stood at 5.8GW at the end of the year, with 33 fully operational projects. It has since passed 7GW of overall capacity.
Among trends of 2017, the Crown Estate found the speed of which projects are being installed is increasing. Between 2005 and 2017, the average build rate grew five-fold, the report stated.
Meanwhile, in terms of project finance, the debt-equity ratio shifted from 70:30 to 75:25, illustrating a growing confidence among lenders.
"This latest report showcases an increasingly mature sector, delivering large-scale, low-carbon power, with record low bid prices for future projects, making the most of the UK's world-class seabed resources and creating jobs opportunities across the country," said Crown Estate director of energy, minerals and infrastructure Huib den Rooijen.
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