RESHeat delivers an advanced 100% RES system on combined cooling, heating, and power (CCHP), including seasonal underground energy storage. The RESHeat system enables: • The use of solar energy as a primary renewable energy source, • Production of heat and electricity by using PV-T (Photovoltaic - Thermal) panels, • Seasonal underground heat storage in the system, • Wastewater heat storage, as well as waste heat recovered from the air-conditioning and industrial processes, • Delivery of the heating and cooling to the building through the heat pump, • Delivery of the electrical Energy to the building The novelties of the system are: • High COP of the heat pump with yearly average over 5.5. Such a high COP enables effective underground energy storage, thus less electrical energy is consumed by the heat pump compressor • Highly efficient ground regeneration due to the heat transfer from the storage unit to the ground and from boreholes through the ground, therefore the COP of the heat pump is not decreasing in consecutive years. • Available heat storage from various sources (PV-T, wastewater, air conditioning and industrial processes) • Coupling PV-T and ETSC (Evaculated Tube Solar Collectors) with sun-tracking systems to achieve electrical energy conversion up to 20 % and maximize renewable energy yield.

RESPONSE supports the Lighthouse cities of Dijon (FR) and Turku (FI) and their Fellow cities Brussels (BE), Zaragoza (ES), Botosani (RO), Ptolemaida (GR), Gabrovo (BU) and Severodonetsk (UA) to facilitate them deliver positive energy blocks and districts. Through RESPONSE ,the two LHs will achieve a local RES penetration of 11.2 GWh/y, energy savings of 3,090 MWh/y and an emission reduction of 9, 799 tons CO2eq/y within their districts. To achieve this goal, RESPONSE demonstrates 10 Integrated Solutions (ISs), comprising of 86 innovative elements (technologies, tools, methods), that are being monitored with specific impact metrics (KPIs). It attracts the interest of various stakeholders by generating innovative business models enabling the upscale and replication of the solutions forming a validated roadmap for sustainable cities across Europe and beyond. RESPONSE adopts an energy transition strategy, which includes 5 Transformation Axes (TAs), encompassing the 10 ISs. TA#1 focuses on transforming existing and new building stock into Energy Positive and Smart-ready. TA#2 focuses on the decarbonization of the electricity grid and the district heating/cooling systems, supporting fossil-based regions in transition and the development of energy communities. TA#3 proposes grid flexibility strategies and novel storage systems for optimizing energy flows, maximize self-consumption and reduce grid stress. TA#4 links existing CIPs with apps and other digital infrastructure to enable digitalisation of services and connected city ecosystems, integrating also smart e-Mobility to promote the decarbonisation of the mobility sector. TA#5 offers interdisciplinary citizen engagement and co-creation practices putting citizen at the forefront of shaping the cities they live in and towards the development of each city’s 2050 own bold city-vision. Special focus is given to creating resilient and safe cities increasing quality of life and lowering the impacts of climate change.

Industrial process heating accounts for 16 % of total final energy demand and 13 % of the greenhouse gas emissions in the EU. Decarbonizing industrial process heating through electrification and increased energy efficiency is a key measure for reaching the climate targets in 2030, reducing the dependency on fossil fuels, strengthening the exploitation of local renewable energy sources and increasing the competitiveness of the European industry. While there are highly efficient technologies, such as industrial heat pumps, available for temperatures below 150 °C, there is a clear demand for novel technologies for processes with heat demands at higher temperatures. EEETHOS will fill this technology gap by developing key-enabling technologies for energy efficient, flexible and decarbonized process heating, and demonstrating them in five installations at industrial end-users at a TRL of 7. The technologies comprise among others, two high-temperature heat pump solutions for steam supply at up to 200 °C, a reversed Brayton heat pump with supply temperatures up to 300 °C, an innovative technology for heat pump-based drying and heating of minerals, a highly integrated steam compression-based solution for superheated steam drying and a heat capturing device for radiative waste heat recovery. These key-enabling technologies will be demonstrated in 5 demonstrators at industrial end-users representing EUs energy intensive process industries: asphalt, ceramics, pulp & paper, bricks and steel. These technologies are scalable for plant-wide implementation, allow a complete decarbonization at energy savings between 43 % to 86 %, based on local renewable energy sources. The development, implementation, operation and scaling of these technologies is optimized by use of digital twin-based solutions. The project will be a cornerstone for enabling a decarbonized, efficient and competitive European industry, by developing and demonstrating key-enabling technologies at large scale.