There are different design options for floating offshore wind turbines, and one company which has been testing and operating them - Equinor - has been impressed with the results. In 2012 Equinor trialled a single floating offshore wind turbine in Norway, where the company is based, before installing five large turbines off the coast of Scotland in 2017. An Equinor spokeswoman said costs came down by 70% with the development of the 2017 project.