The Hot liquid Piston compressor for sustainable Energy supply (HOPE) proposes the development of highly flexible system using 
intermittent renewable electricity capable of (A) upgrading low temperature – waste - heat (<150 °C) to (B) deliver heat up to 250 °C, 
(C) reaching a coefficient of performance of at least 2, at cost < 300 €/kWtherm. The modular concept is scalable from kW to multi
MW.  The scalability and operational flexibility of this approach allows its integration into a wide range of applications with minimal 
modifications of the existing infrastructure when replacing fossil fuel-based steam generators. Additionally, thermal storage capacity 
compensates the mismatch between availability of renewable energy and demand of industrial processes. Combining low-cost, 
adaptability, and storage, the HOPE concept supports industrial decarbonization while minimizing strain on the electrical 
infrastructure.