10/01/2026
“As we celebrate sustainability in October, it has been fascinating to dig through KPF’s archive and find early cases of sustainable design thinking. Before terms like decarbonization and thermal survivability became part of our industry’s everyday language, KPF was already embedding passive strategies in its projects and pursuing ideas that still feel ambitious today,” reflects Global Director of Sustainability Carlos Cerezo Davila.
“Endesa’s Madrid headquarters stands out as a particularly striking example. The building combined an inventive workplace concept with a progressive environmental program, using underground ducts to cool fresh air supplied to the atrium and operable windows to support natural ventilation in the offices. Completed in 2003, it captures an early moment in KPF’s history of sustainable design innovation that continues to inform how we think about energy efficiency, comfort, and resilience today.”
The design for Spanish energy utility provider Endesa’s headquarters transforms the Spanish building tradition of large, internal courtyards into a modern, climate-controlled solution for Madrid’s harsh winters. A 33,000 square foot atrium plays a central role, acting as the “lungs” of the building. Through an innovative design and operable windows the building is ventilated naturally, requiring no conventional air-conditioning.
The atrium also acts as the main circulation space, welcoming visitors and employees alike. Work spaces are arranged around the atrium and are flexible, adaptable to the company’s needs over time.
📸 Javier Azurmendi, H. G. Esch, Espacio Aretha
