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International Energy & Climate Change lawyers

Our team consists of advisors who not only understand your industry, but also work on cutting-edge issues with leaders of energy companies, regulators, governments, industry bodies and investors, across the globe and at every stage of the energy lifecycle.

We are market-leading, global advisers on:

  • Oil & gas exploration and production
  • Mid-stream activities,
  • Traditional or newer electricity generation technologies,
  • Energy transition and climate change strategies
  • Energy efficiency
  • Project finance
  • M&A
  • Energy disputes
  • Regulatory and commercial issues

We aim to drive and facilitate the future of the energy sector and remain thought leaders, by combining our global experience in thought leadership, expert guides and regular LawNows.

Please get in touch with the Head of the global CMS Energy & Climate Change group below.

Here you can find a list of all lawyers globally:

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International desk


Language spoken


Hamish Keith
Hamish W. Keith
The Seni­or Part­ner
Kenya, Nairobi
Hamish is the Senior Partner and the Head of the Corporate & Commercial Department. Born and raised in Kenya, he is qualified as an English Solicitor and Kenyan Advocate. He is also a practicing Certified...
Picture of Penelope Warne
Penelope Warne
The Seni­or Part­ner
Chairman of the UK LLP Board and Head of Energy & Climate Change
United Kingdom, London
Penelope Warne is The Senior Partner and Chairman of the UK Board. She is also Head of Energy.Penelope, an oil and gas specialist, joined the firm in 1993 to set up the Aberdeen office and has a strong...
César Albiñana
César Albiñana
Man­aging Part­ner
Spain, Madrid
César Albiñana is CMS Albiñana & Suárez de Lezo’s Managing Partner. He specialises in advising on mergers and acquisitions, the securities market, corporate law and administrative law.César is...
Picture of Pietro Cavasola
Pietro Cavasola
Man­aging Part­ner
Italy, Rome
Pietro Cavasola is head of the Corporate M&A Department and a member of the Energy group. He is also a member of the CMS Executive Committee.  He has a long-standing international experience and his...
Millar, Stephen
Stephen Millar
Man­aging Part­ner
United Kingdom, London
Stephen Millar is the Managing Partner for CMS based in the UK and is responsible for the management of the firm across the UK, CEE, the Middle East and Asia. He is also a member of the CMS board.Stephen...
Picture of Kostadin Sirleshtov
Kostadin Sirleshtov
Man­aging Part­ner
CEE Head of Energy & Climate Change
Bulgaria, Sofia
Kostadin Sirleshtov is Managing Partner at CMS Sofia and Head of Energy & Climate Change for CEE.His particular area of expertise is in conventional, nuclear, renewables, oil & gas, infrastructure...
Derek Woodhouse
Seni­or Part­ner
Mexico, Mexico City
During the last twenty years, Derek Woodhouse has provided legal advice in many projects with one common denominator: private sector participation in infrastructure projects traditionally reserved to...
Picture of Judith Aldersey Williams
Judith Aldersey - Williams
United Kingdom, Aberdeen
Judith Aldersey-Williams has over 25 years’ experience advising on competition and regulatory matters in the UK and now brings that experience to bear for her clients in the energy sector.Her current...
Valerie Allan
Valerie Allan
United Kingdom, Aberdeen
Valerie Allan is a partner in our Disputes Team. Based in Aberdeen as part of our Oil & Gas Team for over 15 years, Valerie specialises in commercial dispute resolution.  Valerie is dual qualified in...
Jorge Allende Destuet
Jorge Allende D., LL.M.
Chile, Santiago
Jorge is part of the Infrastructure & Projects Group at CMS Chile. He focuses on mergers and acquisitions, capital market operations, and private equity. He counsels international clients on matters of...