50+ Investor-State arbitration cases experience
Antuña & Partners was founded and is managed by Antolín Fernández Antuña, arbitrator, lawyer and economist, with a track-record of more than 20 years in Finance and Law. A former official of the Ministry of Economy and Public Finance (since 2004, currently State Treasury Inspector on leave), he is today one of the world’s most experienced counsels in Investor-State arbitration.
In addition, our team members have intervened in 50+ Investor-State arbitrations (ICSID, PCA, SCC), representing States and Investors in the Energy, Renewables, Mining, Construction, Real State, and Transportation sectors. We provide unparalleled expertise in the field.

CASE: Mainstream Renewable Power Ltd and others v. Federal Republic of Germany
CASE: Dick Fernando Abanto Ishivata v. Bolivarian Republic of Venezuela
CASE: Telefónica, S.A. v. Republic of Colombia
REF: ICSID Case No. ARB/18/3
Expert appointed by Colombia
CASE: The PV Investors v. The Kingdom of Spain
CASE: Corcoesto Mining v. The Kingdom of Spain
REF: PCA Case No. 2016-26
HEARING: Merits and Jurisdiction
PERFORMANCE: Opening Statements, Cross-Examination of Quantum Experts, and Closing Statements
Links to Case Details: UNCTAD
CASE: Canadian Corp. v. Latin American State
REF: Confidential, pre-arbitration stage
ROLE: Counsel for Claimant
CLAIM: Over USD 5 Billion
CASE: Masdar Solar & Wind v. The Kingdom of Spain
CASE: Indian MNE v. Middle East State
REF: Confidential, pre-arbitration stage
ROLE: Counsel for Claimant
CLAIM: Over USD 200 Million
CASE: Stadtwerke München et al. v. The Kingdom of Spain
CASE: Spanish MNE v. Latin American STATE
REF: Confidential
ROLE: Expert
CLAIM: Over USD 100 Million
CASE: BayWa r.e. Renewable et al. v. The Kingdom of Spain
CASE: Spanish MNE v. Latin American STATE
REF: Confidential, pre-arbitration stage
ROLE: Counsel for Claimant
CLAIM: Over USD 150 Million
CASE: RREEF Infrastructure et al. v. The Kingdom of Spain
CASE: RWE Innogy GmbH et al. v. The Kingdom of Spain
CASE: E.ON Finanzanlagen GmbH et al. v. The Kingdom of Spain
CASE: Hydro Energy et al. v. The Kingdom of Spain
CASE: Eiser Infrastructure Limited et al. v. The Kingdom of Spain
REF: ICSID Case No. ARB/13/36
HEARING (1/2): Merits and Jurisdiction
PERFORMANCE: Opening, Cross-Examination of Regulatory Experts, Cross-Examination of Quantum Experts, and Closing Statements
HEARING (2/2): Annulment, First Session, Stay
PERFORMANCE: Preparation and Attendance
CASE: Antin Infrastructure Services et al. v. The Kingdom of Spain
CASE: Greentech, Foresight v. The Kingdom of Spain
REF: SCC Case No. V 2015/150
HEARING: Merits and Jurisdiction
PERFORMANCE: Opening Statements, Cross-Examination of Regulatory Experts, Cross-Examination of Quantum Experts, and Cross-Examination to Fact Witness
Links to Case Details: UNCTAD
CASE: NextEra Energy Global et al. v. The Kingdom of Spain
CASE: 9REN Holding v. The Kingdom of Spain
CASE: Isolux Infrastructure v. The Kingdom of Spain
REF: SCC Case No. V 2013/153
HEARING: Merits and Jurisdiction
PERFORMANCE: Opening Statements and Cross-Examination of Quantum Experts
Links to Case Details UNCTAD
CASE: Charanne (the Netherlands) et al. v. The Kingdom of Spain
REF: SCC Case No. V 2012/62
HEARING (1/2): Merits and Jurisdiction
PERFORMANCE: Preparation and Attendance
HEARING (2/2): Merits
PERFORMANCE: Cross-Examination of Quantum Experts
Links to Case Details: UNCTAD
CASE: Cube Infrastructure Fund et al. v. The Kingdom of Spain
CASE: Novenergia v. The Kingdom of Spain
REF: SCC Case No. V 2015/063
HEARING: Merits and Jurisdiction
PERFORMANCE: Opening Statements and Cross-Examination of Quantum Experts
Links to Case Details: UNCTAD
CASE: InfraRed Environmental et al. v. The Kingdom of Spain
CASE: KS Invest GmbH et al. v. The Kingdom of Spain
CASE: SolEs Badajoz GmbH v. The Kingdom of Spain
CASE: JGC Corporation v. The Kingdom of Spain
CASE: Cavalum SGPS, S.A. v. The Kingdom of Spain
CASE: OperaFund et al. v. The Kingdom of Spain
CASE: Watkins Holdings et al. v. The Kingdom of Spain
CASE: Eurus Energy Holdings v. The Kingdom of Spain
CASE: Sun-Flower Olmeda GmbH et al. v. The Kingdom of Spain
CASE: INVESTOR (conf) v. The Kingdom of Spain
REF: SCC Case
HEARING: Jurisdiction
PERFORMANCE: Preparation and Attendance
CASE: INVESTOR (conf) v. The Kingdom of Spain
REF: SCC Case (Confidential)
HEARING: Jurisdiction
PERFORMANCE: Opening and Closing Statements
MORE CASES
Further, he intervened in the following arbitrations as counsel until 2018, drafting pleadings and/or instructing experts:
- RENERGY S.à.r.l. v. The Kingdom of Spain – ICSID Case No. ARB/14/18
- STEAG GmbH v. The Kingdom of Spain – ICSID Case No. ARB/15/4
- EDF Energies v. The Kingdom of Spain – PCA (Conf)
- Landesbank et al. v. The Kingdom of Spain – ICSID Case No. ARB/15/45
- Mathias Kruck et al. v. The Kingdom of Spain – ICSID Case No. ARB/15/23
- Solarpark et al. v. The Kingdom of Spain – SCC Case No. 2015/163
- Sevilla Beheer et al. v. The Kingdom of Spain – ICSID Case No. ARB/16/27
- Green Power et al. v. The Kingdom of Spain – SCC Case No. 2016/135
- Infracapital F1 et al. v. The Kingdom of Spain – ICSID Case No. ARB/16/18
- Triodos SICAV II v. The Kingdom of Spain – SCC Case No. 2017/194
- FREIF Eurowind v. The Kingdom of Spain – SCC Case No. 2017/060
- DCM Energy et al. v. The Kingdom of Spain – ICSID Case No. ARB/17/41