German turbine OEM Enercon has lost its latest court battle in a long-running UK patent action against Siemens, Dong and other offshore wind heavy-hitters.

Three judges sitting at the Court of Appeal in London rejected an appeal by Wobben Properties, which manages Enercon’s patents, that Siemens' High Wind Ride Through (HWRT) system used on its offshore turbines breached intellectual property IP filed by Enercon founder Aloys Wobben as long ago as 1995.

Enercon’s