Thomas Chellingsworth
Partner - Attorney at Law

Thomas Chellingsworth

Thomas Chellingsworth is a local partner in our Brussels office. He is recognised as a leading energy law expert, with extensive experience of electricity and gas projects and litigation. He heads our Energy & Utilities and Competition & Regulatory Teams.

About Thomas Chellingsworth

Thomas' practice focuses on the energy sector, including in particular renewable energy projects (onshore and offshore wind, biomass/biosteam), security of supply (capacity mechanisms, strategic reserves), grid tariffs, subsidy mechanisms (such as green certificates and, including State aid issues), domain concessions and licences, district heating, contracts (including corporate PPAs and FIDIC agreements), litigation and judicial review (Council of State, Markets Court, Brussels Court of Appeal, Constitutional Court).

Thomas also has considerable experience in the field of competition law, with over thirty merger filings with the European Commission, the Belgian and the Dutch competition authorities.

He is the author of several articles and publications about energy and competition law. 

Thomas speaks annually at the 'Energy Law Capita Selecta' conference and contributes to the Energy Law Annual.

What others says about Thomas

Legal 500 EMEA - Edition 2020– Energy - ranked lawyer in Tier 1

"Thomas Chellingsworth and Christine Delagaye are solution-driven lawyers, which facilitates deal-making."

Legal 500 EMEA - Edition 2021– Energy - ranked lawyer in Tier 1

"Professional, correct, thorough research, a lot of knowledge and the ability to apply this knowledge to specific cases. Thomas Chellingsworth and Christine Delagaye are open to consultation, easy to reach and strategically strong."

"Thomas Chellingsworth is a very communicative and hands-on partner with vast experience in, and knowledge about, the energy sector and a business-oriented approach in his advice"

"Thomas Chellingsworth is a true expert."

Chambers & Partners Europe - Edition 2020 – Energy – ranked lawyer in Band 1 

"Clients highlight Thomas Chellingsworth 's "ability to work within short notice," adding that "the knowledge of the evolution of the regulatory framework that he brings is crucial." He represents clients in judicial reviews regarding network access tariffs, as well as assisting with renewable and green energy mandates."

Chambers & Partners Europe - Edition 2021 – Energy – ranked lawyer in Band 1 

Clients laud him for being "a very driven lawyer with a lot of useful knowledge, who is straight to the point, analytical, friendly and strategically strong."



  • Brussels Bar, 1997


  • Postgraduate Diploma in Economics for Competition Law, King’s College London (United Kingdom), 2009
  • LL.M. in European Law, Universiteit Gent (Belgium), 1997
  • Law degree, Universiteit Antwerpen (Belgium), 1996


  • English
  • Dutch
  • French

T: + 32 2 743 43 43
E: [email protected]


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