The energy hub project consisted of the study, programming, definition of specifications and design of an exemplary construction in terms of sustainable development, in the heart of the Fontevraud Abbey, a "sustainable city" labeled under the ISO 26 000 environmental label. A complete semi-buried complex, entirely landscaped and undetectable once the work was completed, was created opposite the chevet of the Abbey. The program includes: two wood-fired boilers to heat the entire site, 92 photovoltaic panels, perfectly integrated into the Monument, offices, storage areas for archaeological remains, a waste treatment and sorting area and a rainwater collector for watering green spaces.