Aequo fields a cross-disciplinary energy sector practice which is a strong choice across transactions, regulatory matters, international litigation, arbitration, and tax. Its client base includes major domestic producers, international developers and investors, and private equity firms. Denis Lysenko leads the energy and natural resources industry group at the firm, drawing on two decades of experience in which he has acted in the oil and gas, power, nuclear, petrochemical, and renewable energy spaces. Senior partner and head of the dispute resolution practice, Oleksiy Filatov, is heavily involved in energy sector cases, including acting in high-profile arbitrations, cross-border enforcements, and Supreme Court litigation.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
- ‘Team is very experienced in the energy sector, especially nuclear. First choice in Ukraine.’
- ‘Denis Lysenko is excellent.’
- ‘We’ve been working with Aequo’s dispute resolution team for many years on energy matters. They combine precise procedural skills with real sector insight. We value their practical innovation, including early case assessment for complex tariff and contract issues, technology-supported knowledge sharing, and exceptional drafting skills, as well as tight teamwork between partners and associates.'
- 'Olena Pertsova brings decisive courtroom advocacy in technically dense cases.'
- 'Overall, Aequo is responsive, strategic, and business-minded. For complex, high-value energy disputes, they are a standout and deliver results that support long-term market stability.’
- ‘Our experience with Aequo’s energy practice was excellent. We are not a straightforward client, and our transaction was particularly complex because of an unpredictable and unstructured counterparty. Aequo handled this with impressive professionalism and calm efficiency.'
Key clients
- Cameco Corporation
- Naftogaz of Ukraine
- UkrGasVydobuvannya
- Gas Transmission System Operator of Ukraine
- DTEK Group
- Green Genius
- Elementum Energy LLC
- Concorde Capital
Work highlights
Advising Cameco Corporation (Canada) on Ukrainian regulatory matters and approvals stemming from its $7.88bn strategic investment into Westinghouse Electric Company and long-term supply contracts with Ukraine’s nuclear monopoly, Energoatom.
Advising Naftogaz on EBRD’s single loan facility of €500mn to finance emergency import gas purchases, secured by the EU guarantee under its newly-introduced Ukrainian Investment Framework.
Advised Gas Transmission SystemOperator on a set of contracts with US and European suppliers for gas turbine power plants and generator units to sustain Ukraine’s energy infrastructure throughout the 2024-2025 winter season’s severe electricity shortages caused by the Russian missile and drone attacks.
Practice head
Denis Lysenko
Other key lawyers
Oleksiy Filatov; Olena Pertsova