Adaltys Avocats operates from its offices in Paris, Lyon, Marseille, Bordeaux and Rennes, as well as Beijing and Shanghai. The firm is highly specialised in public law, assisting clients with related matters across the energy, transport, healthcare, water and wastewater, telecoms and automotive sectors. Firm chairman Gilles Le Chatelier is based in the Lyon office and specialises in public procurement and energy law. Additional names to note include Bordeaux office lead Xavier Heymans, who specialises in construction law, urban planning and environmental law; Rennes office head Lucie Paitier, an expert in energy law and urban planning; and Marseille office lead Benjamin Boiton, a key contact for public contracts, PPPs and litigation.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
- ‘Xavier Heymans and Jennifer Riffard - they are both attentive, available and responsive advisors. They possess extensive expertise and a remarkable ability to navigate the complexities of private and public law. Jennifer Riffard's analytical skills in public service law are unparalleled.'
- ‘Local presence and coordination between teams.'
- ‘Adaltys distinguished itself from the outset, by precisely identifying our needs and proposing solutions perfectly tailored to them. The firm was able to adapt to our tight schedule and subsequent work interruptions. They work closely with other service providers and are very responsive in answering our questions and offering appropriate solutions.’
- ‘We primarily work with Clément Nourrisson, who demonstrates extensive expertise and is particularly responsive and a good communicator. He is easy to work with, and our exchanges are pleasant and constructive. We recommend him without hesitation.’
- ‘Benjamin Boiton - efficiency, availability, advice.’
- ‘Adaltys stands out for its in-depth knowledge of the local public environment (organisation, decision-making processes, professional culture).’
Key clients
- French State - Ministry of Ecological Transition European Commission Kingdom of Morocco Compagnie nationale du Rhône (CNR) ENEDIS EDF Groupe Caisse des Dépôts Keolis Transdev Dalkia Vinci construction NGE Bouygues Immobilier Altarea Cogedim Danaher Group Becton Dickinson Lundbeck Etablissement Français du Sang (EFS) Thevenin Ducrot Hub One Maïa Group Xerox-Conduent Sipearl BMW France Laurent Perrier Group Joa group Elyse Energy Nepsen group Irizar group Tisséo Ingénierie ARAC Occitanie group SEBL Grand Est group BRL group SAPHIR Oppidea group SPL La Fabrique de Bordeaux Société Domaines Barons de Rothschild Elegia group Region Bretagne Region Bourgogne Franche-Comté Region Auvergne Rhône Alpes Region Centre Val de Loire Region Occitanie Collectivité de Corse Paris La Défense Grand Lyon Metropolis Aix-Marseille Provence Metropolis Lille Metropolis Hympulsion (Engie et Michelin Group) Engie Solutions (Engie Group) GRDF (Engie Group) CNR – Compagnie nationale du Rhône (Engie Group) E.ON Business Solutions AVIA (Picoty Company, owner of the Avia brand in West France) Banque de la Transition Energétique Crédit Agricole Transitions &Energies Crédit Agricole Transition Régions VERSO Group IRISOLARIS Group Tenergie Group Greening Group Statkraft ARTEA / DREAM ENERGY Sun’R (Eiffage Group) AXPO France ELMY Group SMA (inverters) MINT Energy SIPLEC (E.Leclerc Energies) TOKAI COBEX CERN (European Organization for European Research) Groupe GDI Nice Metropolis Rouen Metropolis Bordeaux Metropolis Perpignan Metropolis Saint Etienne Metropolis Toulon Provence Metropolis Grand Port Maritime de Marseille Haropa Port SYTRAL Mobilités Martinique transport Société Aéroportuaire Pôle Caraïbes (SAGPC) Opéra National de Bordeaux Bordeaux University Technique Solaire SPL Energies Réunion Noirmoutiers Communauté Enercoop LNF Energy Mauges Energies Melvan SIEML RTE (EDF Groupe)
Work highlights
Advised SYTRAL Mobilités on the awarding and implementation of the two lots of the €3bn concession for the Lyon metropolitan area's public transport network.
Advised the Collectivité de Corse on the establishment of the Corsican public trade and industry entity, due to come into effect on 1 January 2026, and on the negotiation of concessions for Corsican airports and ports operated by this public entity.
Represented ENEDIS before the administrative court of Dijon regarding the modification of the financial valuation of concession assets by SICECO.
Practice head
Gilles Le Chatelier
Other key lawyers
Xavier Heymans; Jennifer Riffard; Clément Nourrisson; Benjamin Boiton; Lucie Paitier