Andrea I. Sarmentero Garzón

Andrea I. Sarmentero Garzón Member

P: 202.370.4128
F: 202.370.0142
L: Washington, D.C.

Andrea Sarmentero Garzón focuses her practice on energy regulatory and transactional matters. Ms. Sarmentero works with clients in shaping natural gas and electric regulations and policies in proceedings before the Federal Energy Regulatory Commission. Since joining Jennings, Ms. Sarmentero has worked on matters concerning transmission revenue requirements, transmission rate incentives, transmission planning and cost allocation, participation in regional energy and capacity markets, licensing of hydropower projects, compliance with FERC's pro-forma Tariff, and compliance with NERC electric reliability standards and PHMSA standards for natural gas pipelines. Ms. Sarmentero has drafted and negotiated agreements concerning ownership and operation of transmission facilities, power purchases, dynamic transfer of energy, generator interconnection and affected system agreements, as well as water and power supply agreements.

Areas of Focus

  • Energy Law
  • Regulatory
  • Transactional
  • Renewables

Representative Engagements

Ms. Sarmentero has represented clients on various rate proceedings intitiated pursuant to Section 4 and Section 5 of the Natural Gas Act. She successfully represented a client on a litigation to reduce the Return on Equity of public utilities in the MISO region resulting in multi-million dollar reductions in wholesale electric rates. Ms. Sarmentero also negotiated and prepared documentation to integrate one client in the PJM region and drafted necessary pleadings to transfer operational control of a client's transmission line to the CAISO.

Prior to joining JSS, Ms. Sarmentero worked at the New Jersey Board of Public Utilities' Counsel Office where she gained a good understanding of public utilities' businesses and regulatory compliance obligations at the state and federal levels. When at the New Jersey Board, Ms. Sarmentero was heavily involved in regulatory activities at NARUC and OPSI. As part of her work with NARUC International, she went to Kosovo to help energy regulators with electric market design issues and compliance with EU Third Energy Package requirements. In addition, Ms. Sarmentero has extensive energy regulatory and transactional experience in Europe where she worked at the Council of European Energy Regulators, at COGEN Europe and at the Council of the European Union on energy matters concerning the development and implementation of EU energy legislation, including the Third Energy Package. Ms. Sarmentero also represented utility clients on energy and project finance matters in the Madrid office of a global law firm and advised clients on compliance with Third Energy Package requirements.

Articles, Publications and Presentations

Digital Media

Honors, Appointments and Awards

  • NEA-OCDE Fellowship (2005)

Other Languages

  • Spanish (Native)

  • French (Intermediate)

Professional Affiliations

  • Member, New York State Bar Association
  • American Bar Association
    Environment, Energy and Resources Section, Member
    Antitrust Section, Member
  • Member, Energy Bar Association
  • Member, Ilustre Colegio de Abogados de Madrid
  • Member, Hispanic Bar Association of the District of Columbia
  • Member, Women's Energy Network

Admitted to Practice

  • New York, 2012
  • Spain-Ilustre Colegio de Abogados de Madrid, 2005

Court Admission

  • U.S. Court of Appeals, District of Columbia Circuit, 2016
  • U.S. Supreme Court, 2015
  • U.S. Court of Appeals, Fifth Circuit , 2014


  • New York Law School, Foreign Lawyer Training Program, 2009
  • Diploma in Internatonal Nuclear Energy Law, University of Montpellier, 2006
    Montpellier, France
  • Master in Business and International Trade, University Complutense, 2005
    Madrid, Spain
  • L.L.M., University of Dundee (CEPMLP), Energy Law & Policy, 2002
    Dundee, UK
  • J.D., University of Malaga, 2000
    Málaga, Spain