The biggest Danish utility owner has successfully completed the installation of LIOS' Single Mode DTS equipment to monitor the power cable temperature of an offshore UK wind farm. This wind farm consists of 25 wind turbines and running in total 150.000 hours/year, designed for operational usage for in total 20 years. The high voltage power cable route is approx 20km long and connecting the offshore substation to a substation onshore. The DTS system provides real time distributed temperature sensing of the HV cable sections subsea and those inside the towers and ensures save and stable grid operation. Furthermore it helps activating hidden capacity reserves during dynamic transmission requests.