Energy and natural resources
Alexandre Calmon, co-head of the corporate and M&A practice at COSRO, is a go-to adviser for international clients in both the conventional and renewable energy sectors. He is particularly recognised for his strong track record in high-value transactions within the oil and gas industry, where he acts as a trusted counsel to leading hydrocarbons players such as ONGC Campos and Perenco Petróleo e Gás. Notably, he recently advised Perenco on its $1bn acquisition of Petrobras’ entire interest in the Cherne and Bagre Fields.
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Accolades
Rio de Janeiro Elite
Mentions
Profile
Work Department
Energy
Position
Managing Partner
Career
Marcelo Frazão serves as Managing Partner of COSRO, where he leads our firm’s transactional practice and is highly regarded for his expertise in complex, high-value M&A transactions, joint ventures, and commercial contracts involving energy assets. His work spans the entire energy value chain, encompassing traditional oil and gas, renewables, biofuels, and energy transition projects. Marcelo primarily counsels international clients with interests or operations in Brazil, including project developers, offtakers, construction and shipping companies, global suppliers, and financial institutions. Over the course of his career, he has been involved in transactions exceeding USD 8 billion in asset value.
Marcelo is also distinguished for his highly regarded experience in dispute resolution, particularly in high-stakes arbitration. He has represented clients in disputes totaling more than USD 1.7 billion in the Brazilian market over the past five years, with a focus on energy and construction arbitrations.
His work also includes innovative energy production and decarbonization initiatives, including advanced biofuels (such as renewable diesel, SAF, and biomethane), low-emission hydrogen and ammonia, carbon capture and storage (CCS), and carbon market mechanisms. He works closely with clients to develop and implement strategies for reducing carbon emissions, always with an emphasis on ensuring energy security and accessibility.
Languages
Portuguese, English, Spanish
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