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Guillermo González-Molina

Associate, Madrid

Biography

Guillermo is an associate in the Firm's International Arbitration Group in Madrid. He focuses on complex investment and commercial arbitration cases. His experience revolves around disputes in the renewable energy, infrastructure and transportation sectors in Latin America, Spain, and Eastern Europe.

Guillermo has represented clients in arbitrations under the rules of the International Centre for the Settlement of Investment Disputes (ICSID) and the International Chamber of Commerce (ICC), amongst other institutions. In addition, he has experience in class actions, annulment and enforcement proceedings, as well as in advising clients on structuring investments, managing litigation risks, assessing potential arbitration claims, designing procedural strategies, and navigating sovereign immunity laws.

Before joining the Firm, Guillermo was based in Brussels, where he served as a communications and policy officer at an interest group. He currently serves as Adjunct Professor at European University in Madrid and regularly engages as a guest speaker in different higher education institutions, including Duke University School of Law and IE University.

Experience

Some representative examples of Guillermo's experience include advising/representing:

Investment Arbitration

  • Representing Guatemalan investors in an ICSID arbitration against the Republic of Honduras under the DR-CAFTA. The Tribunal established jurisdiction, including through the first-ever interpretation of certain Treaty provisions, and the proceedings have now advanced to the merits stage. *
  • Representing a Panamanian renewable energy investor in ICSID proceedings against a Central American State under the Panama-Central America free trade agreement over a dispute related to one of Latin America's largest PV plants. *
  • Successfully representing the Republic of Albania in an ICSID arbitration involving claims by a German investor under the Germany-Albania bilateral investment treaty, in relation to a concession for the operation of a port terminal. The dispute was successfully settled to the benefit of our client.
  • Successfully representing Mitsui & Co. in an ICSID arbitration against Spain under the Energy Charter Treaty involving investments in the Spanish CSP sector. Currently representing Mitsui in defending the award in ICSID annulment proceedings. *
  • Acting for a Spanish energy company in its US$600 million ICSID arbitration against a Latin American State, in a dispute relating to measures affecting the claimant's investments in the power-generation sector.

Commercial Arbitration

  • Advising a European multinational group on a dispute arising out of the O&M contract of one of Latin America's largest infrastructure projects. The dispute was successfully settled through a mediation process.
  • Acting for the main contractor in one of the world's largest infrastructure projects located in Central America, in proceedings before the Dispute Adjudication Board (DAB) and related ICC arbitration against the Employer, worth in excess of US$2 billion.
  • Representing a British concessionaire in a Geneva-seated ICC arbitration arising out of the EPC Contract of a US$1.2 billion motorway project in Eastern Europe. The dispute was successfully settled to the benefit of our client.
  • Successfully acting for a Belgian industrial group in a commercial arbitration in the Madrid Court of Arbitration concerning an M&A dispute.
  • Serving as tribunal secretary in a Lima-seated arbitration related to a real estate and construction dispute under Peruvian law.

International Litigation

  • Managing international civil and criminal litigation matters for an S&P 500 company in Spain and Portugal, with an aggregate value of over US$40 million. *
  • Successfully advising an oil and gas company in a class action before Dutch courts on a case related to the securities market.
  • Assisting an ICSID award creditor in developing a comprehensive, multi-jurisdictional enforcement strategy against a European State.
  • Successfully representing one of Spain's largest contractors defending a favorable award in annulment proceedings before the High Court of Justice of Madrid and securing the payment of said award.

Advisory

  • Advising a Latin American group on a corporate structuring of its investment in a multibillion-dollar project in a high-risk jurisdiction.
  • Advising a multinational group on a corporate restructuring to maximize the investment treaty protection of its worldwide assets.
  • Providing advice to different investors on matters related to sovereign immunity.
  • Assisting a Spanish investor with energy projects in Mexico in preserving its international arbitration rights amid changes to Mexico's legal framework.


(*) Ongoing

Professional Highlights

Spain
Master's Degree in International Business Law
Centro de Estudios Garrigues
Bachelor of Laws (LLB)
Universidad Francisco de Vitoria
BA in International Relations
Universidad Francisco de Vitoria
Master's Degree in Leadership
Escuela de Liderazgo Universitario del Banco Santander y la UFV
Spanish
English
French
Portuguese

Ayuda's 2026 Pro Bono Impact Award

Panelist: 'Evidence in Arbitration: The Impact of New Technologies', 8th International Congress on Young People and the Future of Arbitration, Peruvian Institute of Arbitration (2026, Webinar)

Panelist: 'Future challenges in the role of the expert', 6th International Congress on Legal Skills in International Arbitration, Peruvian Institute of Arbitration (2024, Webinar)

Service areas