Horizontal Directional Drilling in a total six crossings for electricity interconnection project of Wind Power Generation System 23.1 MW at Agistro and 15 MW at SIdirokastro. At four of the crossings, 3Ø200mm + 1Ø110mm HDPE pipes were installed with total length 980 m. and at the other two 4Ø200mm + 1Ø110mm HDPE pipes were installed with total length 1100 m.