Siemens has supplied the electrical equipment for two offshore substations, which have been installed at the London Array wind farm. The substations bundle the power generated by the 175 Siemens SWT-3.6 wind turbines before it is transported via high-voltage subsea cable to the coast. On each of the platforms there are two 180-MVA transformers and medium-voltage switchgear. The requisite protection and instrumentation and control equipment is also installed on the platforms. Distribution over two platforms has the advantage that the cable routes within the wind farm are short, and power transmission losses are kept as low as possible to enhance the wind farm's energy efficiency.