From a legal perspective, connecting offshore wind parks to onshore electric grids is one of the central problem areas of offshore wind energy. Given the technical and economic challenges of offshore wind energy extension, interests of all participants are to be aligned through the amendment of 17 a ff. En WG. The focus of this work will be to clarify the concrete code of duties for transmission network operators vis-a-vis offshore wind park operators, to define the limits of the duty of cable installation, and to specify the legal consequences of violating this duty. Special focus will be on the right for compensation claims of wind park operators in 17 e Abs. 2 En WG. The work combines the status quo of the current jurisdiction and literature with the authors own further legal argumentation.