Thermal energy storage (TES) can reduce the need for dispatchable energy sources for two reasons: Firstly, it can bridge the mismatch in time between energy supply and energy demand on the electrical grid, by converting electrical energy into thermal energy, storing this thermal energy and when needed converting this thermal energy back to electricity by means of a heat to power cycle. Secondly, recovery of waste heat from industrial processes using TES can reduce the final energy consumption. In this paper, the behavior of a pilot scale latent heat thermal energy storage (LHTES) unit with a (latent) storage capacity of 100 kWh is experimentally analyzed. As phase change material (PCM) an eutectic nitrate salt mixture of KNO3 and NaNO3 is used with a phase change temperature of 222°C. The storage unit is a finned shell-and-tube type heat exchange and is part of a test rig consisting of a 250 kWe heater and 11 kWe ORC, interconnected via a thermal oil circuit. To characterize the storage unit, the evolution of the HTF outlet temperature and the charging power is analyzed at different HTF inlet temperatures and flow rates.