The project H2home - decentralised energy supply by hydrogen fuel cells is part of the HYPOS initiative (Hydrogen Power Storage & Solutions East German) and has the aim to develop an embedded system suitable for the highly efficient use of electrical, thermal and cooling energy provided by green hydrogen in domestic applications. This system is characterized by a hydrogen CHP plant based on a low temperature PEM fuel cell and a hydrogen-based heat generator module with the application of condensation technology as well as an integrated solution for the use of electrical energy in an AC and DC grid through power electronic components. The electric efficiency of the CHP is nearly 50% and the total efficiency higher than 95%. To evaluate the performance of the proposed technology the first step was to model a reference case using the simulation tool TRNSYS. Therefore, a multi-family house with 16 residential units was chosen. Within the next step different technologies for the energy supply in complex buildings were identified and evaluated. For this purpose, various Key Performance Indicators (KPI's) have been defined and summarized in three main groups allowing a technical, ecological and economical comparison of the selected technologies. The method as well as the main results of the KPI investigations will be explained in the present paper. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.