Renewable low grade heat, such as geothermal and solar thermal sources, is of increasing interest to support the energy mix. The TREES concept to be demonstrated in this project is a highly disruptive and versatile energy system and the IP has been protected to aid future commercialisation. This is a zero carbon emission solution based on thermochemical sorption technology providing combined thermal and electrical energy storage and the delivery of heating, cooling and/or electrical power in one integrated system. It has potential to substantially reduce fossil fuel consumption and energy demand in a wide range of applications. The theoretical foundation of the TREES concept has been proven in previous research projects through modelling and laboratory experimentation. Hence the technological know-how and understanding of each system component required to deliver this project and to demonstrate the technical feasibility of the TREES system has already been acquired.