Partner-in-Charge Madrid

(T) 34.91.520.3939

Mercedes Fernández focuses her practice in the area of civil and commercial jurisdiction, both in arbitral and judicial proceedings. Her litigation experience is centered on disputes involving construction contracts and large civil engineering projects, construction defects, energy projects, commercial litigation, and conflicts arising from M&A transactions. Mercedes is also very active in investment arbitration. She is Partner-in-Charge of the Madrid Office and leads the Global Disputes Practice in Madrid.

Mercedes has participated in proceedings before Spanish courts at all levels, including the Supreme Court. She has acted as counsel in national and international arbitration proceedings. Among the latter, she has participated in ad hoc and institutional arbitrations. Her broad experience in arbitration includes proceedings governed by UNCITRAL and ICC Rules, as well as investment arbitrations before the World Bank (ICSID). She has civil and commercial law experience in construction, corporate matters, and acquisitions. Mercedes also acts as an independent arbiter.

Recent engagements include the representation of Urbaser (ACS Group) and CABB in an ICSID arbitration related to a dispute involving pesification and freezing of tariffs against the Argentine government, a current investment arbitration claim filed by two Spanish companies against Ecuador derived from the construction of a LNG project, and the representation of a Panamanian company with Spanish capital in an ICC arbitration in Panama related to the structure of a hydroelectric plant.

Mercedes conducts classes and presentations on international, investment, construction, and engineering arbitration to students in programs offered by Instituto Superior de Derecho y Economía and Instituto de Empresa.



  • Ferrovial Agroman defends against arbitration related to construction disputesJones Day represented the Spanish construction company Ferrovial Agromán in several arbitration disputes related to construction contracts (Betis football stadium, Murcia distillation plant producing bioalcohol).
  • Acciona Group participates in arbitral proceedings initiated by four Losan Group companiesJones Day represented the Acciona Group in arbitral procedures initiated by four Losan Group companies related to cogeneration projects.
  • Urbaser arbitrates issue of water concession in Buenos Aires against Republic of ArgentinaJones Day is advising Urbaser, S.A. (filial of the ACS Group) and Consorcio de Aguas Bilbao Bizkaia (CABB) in an ICSID arbitration against the Republic of Argentina in relation to a water concession in Buenos Aires.
  • Genentech resolves multijurisdictional dispute against contractor hired to convert pharmaceutical plant in SpainJones Day represented Genentech, Inc. in a dispute with a design-build engineer/contractor hired to convert a pharmaceutical plant located in Porriño, Spain.
  • Enersis group claims 1.3 billion USD in ICSID arbitrationJones Day is representing the Enersis Group (Enersis), the Chilean holding company of one of the largest private electrical groups in the world, as claimant in an ICSID arbitration in Washington, D.C.
  • Acciona Group obtains Madrid arbitral award related to energy plant and energy supply agreementJones Day was instructed by the joint venture UTE Alabe-Moinsa (whose majority partner is the Acciona Group) to institute arbitral proceedings under the rules of the Madrid Chamber of Commerce Arbitration Court against one of the member companies of the joint venture.
  • Acciona Group wins favorable arbitral award in dispute related to start-up delay of two energy plants built by joint ventureJones Day advised the joint venture UTE Alabe-Sergas (whose majority partner is the Acciona Group) as co-respondent in the ex aequo et bono arbitration initiated by Neumáticos Michelin under the rules of the Madrid Chamber of Commerce Arbitration Court.
  • Ferrovial Inmobiliaria prevails in proceeding relating to warehouse leaseJones Day represented the Spanish real estate company Ferrovial Inmobiliaria in various construction defect proceedings.
  • Tecnicas Medioambientales Tecmed (ACS-Dragados Group) makes ICSID arbitration claims against the Mexican governmentJones Day representing the Spanish investor Tecnicas Medioambientales (TECMED) part of the ACS-Dragados Group in the expropriation claim filed against the United Mexican States in ICSID arbitration proceedings.
  • NESCO resolves in judicial and arbitral proceedings disputes related to large construction projectsJones Day represented the Spanish construction company NESCO, a division of Acciona, S.A., in several judicial and arbitral proceedings in relation to large construction projects (Zaragoza Wastewater Treatment Plant, Itoiz Dam, Irurtzun Motorway, Inc.).
  • Necso pursues arbitration regarding construction of Medellin Metro in ColumbiaJones Day is advising a consortium of Spanish and German companies, mainly engineering and construction companies, against ETMVA, a municipal public entity in Colombia, regarding the construction of the Medellin Metro in Colombia.
  • Vista Desarrollo prevails against action by construction company resulting from purchase of Essa sharesJones Day successfully defended Vista Desarrollo S.A. (part of the Banco Santander Group) against a judicial complaint filed by the construction company Huarte as a result of the purchase of shares of the company Essa.
  • Fomento De Construcciones Y Contratas (FCC) in arbitration proceedings against Panamanian companyJones Day represented the Spanish construction company Fomento De Construcciones Y Contratas (FCC) in an ICC arbitration against the Panamanian company CTT (Taiwanese capital) involving disputes arising from the construction of the Coco Solo port (Panama).
  • Additional Publications

    • July 20172017 Arbitration Yearbook: The counterclaim in investment arbitration, reality or illusion?
    • 2017Commentary to Law 29/2015 on International Legal Cooperation in Civil Matters
    • June 20162016 Litigation practice for lawyers - Sales contract of future property (plot): compliance with conditions and granting of public deed

    Speaking Engagements

    • 4 de abril, 2019
      La diversidad de los equipos directivos: transformando retos en oportunidades
    • April 4, 2019
      Successful Stories of Balanced Leadership: Transforming Challenges into Opportunities in the Workplace
    • 13 junio, 2018
      Arbitraje y litigios transnacionales en las nuevas tecnologías: Blockchain y Criptomoneda
    • June 20, 2017
      Spanish Club of Arbitration Annual Conference: "The effects of corruption on contracts in arbitration"
    • November 2015
      3rd Conference of judges and arbitrators of the Madrid Chamber of Commerce: allied for the resolution of commercial disputes. 2nd Panel - Public order and judicial control of arbitration
    • Octubre 2010
      Subsistencia del Arbitraje como Remedio Ocasional, en la actividad El Arbitraje y su Problemática Actual, organizada por el Servicio de Formación Continua del Consejo General del Poder Judicial, celebrada en Madrid entre el 29 de septiembre y el 1 de octubre de 2010
    • October 2010
      The Subsistence of Arbitration as an Occasional Remedy, Conference on the Current Problems of Arbitration, General Council of the Judiciary in Madrid
    • October 2009
      The Arbitration Agreement in Writing, Second Joint Conference of the Spanish and French Arbitration Clubs in Madrid, Arbitration Committee of the International Bar Association
    • Octubre 2009
      Convenio Arbitral. Forma Escrita, en la II Jornadas Conjuntas Franco Españolas organizadas por el Club Español de Arbitraje y el Comité Français de l'Arbitrage con el patrocinio del Comité de Arbitraje de la IBA
    • Diciembre 2007
      La eficacia de los sistemas alternativos en la resolución de conflictos, en la conferencia organizada por el Club Español de Arbitraje sobre "Arbitraje de Construcción: Algunas cuestiones de interés"
    • December 2007
      The Effectiveness of Conciliation in Construction Arbitration, Spanish Arbitration Club
    • Mayo 2004
      Segunda Conferencia Especial sobre Arbitraje sobre la nueva Ley de Arbitraje española, patrocinada por Jones Day en Madrid
    • May 2004
      Second Special Arbitration Conference on the New Spanish Arbitration Law, sponsored by Jones Day
    • February 2004
      New Spanish Arbitration Law Conference, workshop organized by NECSO Legal Department (Acciona Group)
    • Febrero 2004
      Conferencia sobre la nueva Ley de Arbitraje española, jornada organizada por el Departamento Jurídico de NECSO (Acciona Infraestructuras), en Madrid
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