Adaltys Avocats > Lyon, France > Firm Profile

Adaltys Avocats
LYON 69006

France > Industry focus: Energy Tier 1

Adaltys Avocats has an impressive client base comprising many of France’s leading private companies and their subsidiaries, alternative developers, as well as large metropolises such as Lyon and a number of regions as public sector clients. The practice acts on matters pertaining to all types of energy production, including solar, nuclear, biogas, hydrogen, as well as on electricity transport and storage matters. With its state-of-the-art regulatory expertise, the practice is regularly retained for the country’s most strategic matters, including managing regulatory disputes before courts and the regulator. The group's contract and project expertise is also first-class and in demand for cutting-edge projects, such as the development of biogas charging stations for vehicles in the city of Lyon. The team is also a popular choice for market firsts, such as the setting up of the first fiducie (trust) in France in relation to the sale of energy.  Jerome Lépée heads the practice, which also includes Gilles Le Chatelier, both leading references in the field. Romain Granjon and Cyril Delcombel are other key contacts.

Practice head(s):

Jérôme Lépée


‘Great listening skills and technical understanding of subjects related to energy.’


‘Good knowledge of the energy sector and quite creative.’

Key clients

CNR (Engie Group)

GRDF (Engie Group)

TEKSIAL (Engie Group)

ENEDIS (Engie Group)


EDF ENR (Engie Group)


GCK Energy


SHEMA (EDF group)

DALKIA (EDF group)

VINCI energy

STEF group

SERFIM group




IB Vogt

Terre et Lac

SMA Group

RES Group

Térega group

E.ON Group


BCM / Planète Oui

Région Grand Est

Région AuRA

Région PACA

Métropole de Bordeaux

Métropole de Aix-Marseille

Métropole de Lyon

Jersey Guernsey electricity

ZE Energy

Aéroports de Lyon

Planète OUI

ZE Energy

Work highlights

  • Assisting the CNR on a wide range of issues.
  • Assisting GRDF group with issues related to biogas in France.
  • Assisting a major energy company with contractual arrangements around Power Purchase Agreements (electricity and heat) and energy saving certificates (CEE).

France > The regions Tier 1

Adaltys Avocats' presence in Paris, Lyon, Marseille, Bordeaux and Rennes demonstrates its impressive coverage of French regions. Not only strong in France, the firm was also among the first foreign law firms to obtain authorisation to open an office in China. Renowned for its public law expertise, the firm has assisted numerous ministries and major French conurbations. The team also has an impressive track record of advising major private companies such as EDF and Enedis.

Key clients

Ile de France Mobilités


Métropole de Toulon


Stade De France

France > Administrative and public law Tier 2

Adaltys Avocats has large resources which allow the firm to advise on the full range of public law issues. With several offices across the country (Paris and Lyon are as its main bases, followed by Bordeaux and Marseille), the firm has a strong presence alongside public local entities, including large metropolises such as Lyon, but also an equally prominent client base in the private sector where it assists leading companies, notably in the transport, energy, waste and football industry sectors. The firm manages an impressive workload, advising on high-profile construction projects, public procurement and general public law subjects. It is involved in a number of ambitious urban revitalisation projects, notably in Lyon where its combined leading expertise in the energy and transport sectors are other assets. The team also assists many top clients in the sport and leisure sectors; it is involved in several Paris Olympics projects and is also a key adviser to many of France’s largest ski resorts in the Alps. Gilles Le Chatelier in Lyon and Laurent Sery in Paris co-head the practice, which also includes the Lyon-based Romain GranjonJean-Marc Petit, Clément Nourrisson, Philippe Nugue; the Paris-based Guillaume Chaineau; the Marseille-based Benjamin Boiton and Xavier Heymans in Bordeaux.

Practice head(s):

Gilles Le Chatelier; Laurent Sery


‘The firms stands out by its responsiveness and the accuracy of its analyses.’

‘Active listening and perspicacity.’

‘A very available team, attentive to our needs, with very committed partners. High-quality interventions.’

‘Partners are very available and attentive, keen to best meet our needs.’

Key clients

Ile De France Mobilité

SNCF Group



CNR – Compagnie Nationale du Rhône

UTC Group (OTIS/Chubb)

Xerox – Conduent







Sequano Aménagement

Radio France

JOA Group




Métropole de Lyon

Métropole de Marseille

Métropole Européenne de Lille

Métropole de Nice

Métropole de Rouen

Métropole de Bordeaux

Métropole de Saint-Etienne

Métropole de Toulon

Métropole de Nantes

Métropole d’Annecy

Région AuRA – Auvergne Rhône Alpes

Ministère de la transition écologique

Ministère de la cohésion des territoires

Département de la Haute-Garonne

Département de la Dordogne

ADEME – Agence De l’Environnement et de la Maîtrise de l’Énergie

APIJ – Agence Pour l’Immobilier de la Justice

OPPIC – Opérateur du Patrimoine et des Projets Immobiliers de la Culture

Grand Port Maritime de Rouen

Grand Port Maritime de Marseille

Grand Port Maritime de Nantes St Nazaire

Grand Port du Havre

SYTRAL – Syndicat des Transports de l’Agglomération Lyonnaise

Région Sud – Provence Alpes Côte d’Azur

Région Bourgogne Franche-Comté

Région Centre Val de Loire

Région Occitanie

Val d’Isère Ski resort

Courchevel Ski resort

Serre-Chevalier Ski resort

Collectivité de Corse

Work highlights

  • Renegotiating Ile de France Mobilité’s historic contract with the RATP, pertaining to the largest transport concession in Europe.
  • Advising Stade de France on the future of the stadium following the completion of the Rugby World Cup in 2023 and the Olympic and Paralympic Games in 2024.
  • Advising Toulon Metropolis on a new public passenger transport concession, involving numerous types of transport (land and sea), and highly innovative aspects (development of a hydrogen maritime shuttle powered by a land-based refueling station).