Mayer Brown’s Global Energy Group named a 2025 “Practice Group of the Year” by Law360

Mayer Brown has been recognized by Law360 as one of its 2025 Energy Practice Groups of the Year—an honor reserved for the most recognized practice groups in the industry and highlighting firms that shape the year’s most impactful energy matters.

Throughout 2025, Mayer Brown’s Global Energy Group advised clients during a series of groundbreaking projects for the energy sector, including:

• The most significant Argentinian energy infrastructure project in recent years: Acting as international legal advisor to Chevron Argentina S.R.L., an affiliate of Chevron Corporation, on its participation in the 437 km, $3 billion Vaca Muerta Oil Sur (VMOS) crude oil export pipeline project in Argentina. 
• A first of its kind clean energy infrastructure financing: Representing Standard Chartered Bank as senior lender and administration agent on the establishment of its historic clean energy infrastructure financing joint venture with private equity firm Apollo. This transaction was the first of its kind: a pioneering $3 billion platform developed through a joint venture between a bank and sponsor. 
• The only federally authorized LNG export project on the US Pacific Coast: Advising POSCO International in connection with its equity investment in the $45 billion Alaska LNG project in the United States.
• Iraq’s first LNG import terminal: Advising Excelerate Energy, Inc. on the execution of a definitive agreement with a subsidiary of Iraq’s Ministry of Electricity to develop and operate a fully integrated floating LNG import terminal at the Port of Khor Al Zubair. 
• The largest energy M&A transaction in Latin America in 2025: Advising PRIO on two sequential cross-border acquisitions totaling approximately $5.4 billion, involving the Peregrino and Pitangola oil fields in the Campos Basin. Most recently, the firm advised PRIO on the $3.5 billion acquisition of Equinor’s 60% stake and the transfer of operatorship of the assets. Previously, the firm advised PRIO on the $1.9 billion acquisition of Sinochem Petroleum Netherlands, which indirectly held a 40% participating interest in the fields. Both transactions involved complex, multi-jurisdictional coordination across multiple jurisdictions, including Brazil, the United States, the United Kingdom and Hong Kong.
• The largest power company in Latin America and a global leader in renewable energy: Advising Eletrobras (now Axia Energia) and its subsidiary Eletronuclear on legal, regulatory, and tax matters related to the Angra 1, 2, and 3 nuclear power plants. This is a landmark case in Brazil and Latin America, reflecting the complexity and strategic significance of the nuclear energy sector and highlighting the project’s pioneering role in advancing regulatory, tax, and technological developments within this essential industry. The firm also advised Eletrobras (now Axia Energia) on the approximately $940 million sale of its portfolio comprising thirteen operational gas-to-power plants to Ambar Energia, providing strategic and transactional guidance throughout the process to ensure a successful divestment and alignment with the company’s broader restructuring objectives.

Additionally, Mayer Brown’s Global Energy Group advised clients on a wide range of transformational projects and disputes across the energy sector globally, including: 

• Achieving a significant appellate victory on behalf of TC Energy Corp. in the Delaware Supreme Court, which reversed a $199 million judgment previously entered against the company in connection with its $13 billion acquisition of Columbia Pipeline Group Inc.
• Advising PETRONAS on a 20-year Liquefied Natural Gas sale and purchase agreement with a subsidiary of Pembina Pipeline Corporation for one million tonnes per annum of liquefaction capacity at the Cedar LNG facility located in Canada.
• Advising PETRONAS on its $1.5 billion sale to Vista Energy, S.A.B. de C.V. (Vista) and Vista Argentina S.A.U. of 100% of the capital stock of PETRONAS E&P Argentina S.A. (PEPASA), including a 50% working interest in the La Amarga Chica unconventional oil and gas concession in the Vaca Muerta formation located in Neuquén, Argentina.
• Advising Pluspetrol, S.A. on its multi-million dollar acquisition of ExxonMobil Exploration Argentina S.R.L. from ExxonMobil Argentina Investments B.V. and QatarEnergy Argentina Holdings LLC, including a working interest in the Bajo del Choique-La Invernada unconventional oil and gas concession in the Vaca Muerta formation located in Neuquén, Argentina and a stake in the Oleoductos del Valle (Oldelval) oil pipeline.
• Advising Fotowatio Renewable Ventures on an approximately $5 billion green hydrogen project. The work involved a projection of energy prices and distribution charges for the Final Investment Decision on the H2 Cumbuco Project, an ambitious green hydrogen initiative at the Pecém Industrial and Port Complex aimed at positioning Brazil in the global green energy market, including assessing regulatory trends and the impacts of the Brazilian Tax Reform. 
• Serving as lead counsel to United States Steel Corporation (US Steel) in US Steel’s court challenge to President Biden’s decision to block its proposed merger with Nippon Steel Corporation, valued at approximately $14.1 billion.

In addition to the above matters, the firm represents leading multinational energy companies in high‑value international energy arbitrations, drawing on deep experience with cross‑border disputes involving complex long‑term project and investment agreements.

Mayer Brown’s Energy practice brings decades of experience across the oil, natural gas, LNG, and power sectors. The team pairs deep industry insight with a strong record of navigating the complex risks inherent to energy transactions and has a global footprint spanning Brazil, Dubai, Hong Kong, Houston, London, New York, Paris, Singapore, Tokyo, and Washington DC.

Law360’s annual Practice Groups of the Year awards recognize firms whose work demonstrates exceptional results, significant impact, and meaningful contributions to the field. For 2025, five firms were selected in the Energy category. The honorees were selected from nearly 800 submissions across more than 30 categories.

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