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Abstract. In the framework of the H2SusBuild project, a prototype hybrid energy system combining Renewable Energy Sources (RES) and hydrogen (H2), as energy storage material and as a green fuel, has been designed, installed and is currently in operation in Lavrion, Greece. The system comprises thin-film PV panels, wind turbines, a water electrolysis unit, a H2 compressor, a micro-CHP unit (PEM fuel cell) and a H2 burner. The aim of this system is to cover the energy needs of a ≈500 m 2 office building and to render it a self-sustained, zero CO2 emission installation. The entire site is operated through an advanced Energy Management and Control System (EMCS), responsible for monitoring magnitudes of interest (for example power, energy, stored H2 volume etc.) and managing the synergistic operation of all components based on a custom developed control algorithm. This paper's aim is to present the results of system operation and evaluate the performance of key components based on data collected during system operation under real conditions. The results show good efficiencies for all major system components and that the implemented control algorithm achieves the zero CO2 emissions goal.

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