Guillaume Decaen

About Guillaume Decaen

Guillaume Decaen is Regional CEO – France at Neoen, one of the leading independent renewable energy producers in France and abroad. In this role, he oversees Neoen’s French operations across the full project lifecycle, from origination and development to execution and delivery, with a focus on solar power, onshore wind, and battery storage. His responsibilities place him at the center of Neoen’s long-term growth strategy in France, a core market for the company. A graduate of ESTP, Guillaume Decaen has built a career grounded in infrastructure, concessions, and large-scale projects with complex contractual and stakeholder dimensions. He began his career in 2004 at Eiffage, working on real estate development programs in the Île-de-France region. In 2006, he moved to Technip in Qatar as a site manager, before joining Eiffage’s concessions division in 2007. Over the following decade, he helped develop public-private partnership and infrastructure concession projects across Europe, Sub-Saharan Africa, and Canada. This experience gave him strong expertise in contract structuring, project execution, and the management of relationships between public and private stakeholders. In 2014, he played a role in structuring the construction and maintenance contracts for the Cestas power plant, one of France’s landmark solar projects. He joined Neoen in 2016 in procurement, before becoming Head of Business Development in France in 2020. His internal progression reflects a steady rise in responsibility, based on his understanding of industrial, regulatory, and territorial issues. In 2021, he spoke on behalf of Neoen when the company crossed the one-gigawatt mark in operation or under construction in France, highlighting the importance of local engagement and collaboration with communities. His expertise spans renewable asset development, multi-stakeholder project leadership, complex contract negotiation, and the creation of long-term value in a fast-changing energy environment. In a sector where land access, local acceptance, and project risk management are critical, Guillaume Decaen stands out as an experienced, strategic, and highly operational executive.