The local energy supplier Energie Steiermark implemented a wind park with an investment of 58 million Euros. It is the biggest project for a wind park in the South of Austria. 13 windmills are supplying renewable energy to more than 21,000 households. The overall performance is 39 megawatts, annually 76 gigawatt hours green electricity are being generated. Hitherto, the wind energy producer Enercon has installed energy cables from the windmills to the transformer stations by means of expensive underground conduits. We presented an alternative: an energy cable that can be buried directly into the earth, which means a considerable cost benefit for the constructor.