The German turbine manufacturer’s blade modifications involved adding a 'power curve upgrade' (PCU), which, according to the company, can increase annual energy production by 1.5% at an annual average wind speed of 7.5m/s.
The upgrade consists of three tailor made aerodynamic components and a software update. The components are strategically placed on the outside of the blades to optimise aerodynamics.
A spokesperson for London Array said: "Since our turbines were originally developed, there have been improvements to blade aerodynamics.
"As a result, we implemented a blade upgrade package, meaning we are getting more energy out of the same infrastructure."
Siemens states the upgrade enable the turbine to better utilise the wind resulting in a better power performance.
A spokesperson for Siemens said: By utilizing aerodynamically tuned add-on components, including the DinoTails, DinoShells and Vortex Generators, blade performance can be improved.
"These add-on components are strategically placed along the blade length to expand the blade profile near the root, improve the trailing edge flow characteristics, and improve the flow characteristics along the blade surface."
The PCU is available for Siemens’ SWT-2.3-82, SWT-2.3-93 and SWT-3.6-107 turbines – on and offshore - and has been available since 2010. It was installed at the 209MW Horns Rev II wind farm.