
Kambourov & Partners is home to an experienced energy and natural resources team that frequently assists with the development of renewable energy projects, electricity and gas infrastructure, and investments. The group represents a wide array of clients including energy project developers, investor-owned utilities and lenders. At the helm of the practice, Stefan Tzakov is particularly impressive in energy-related disputes, with experience before Bulgarian courts, the Energy and Water Regulatory Commission and the Ministry of Economy and Energy. Another key member of the team is Irena Petkova, whose practice has a notable emphasis on energy projects and regulatory matters.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Sector knowledge
Testimonials
Collated independently by Legal 500 research team.
- 'They stand out for their exceptional collaboration, understanding of the energy industry, attention to detail, and promptness in answering the client's questions.'
- 'Stefan Tzakov is a leading practitioner in the firm’s energy and natural resources practice, recognised for his deep understanding of energy regulation, project development, and infrastructure transactions. He advises both domestic and international clients on the full spectrum of energy-related matters, including renewable and conventional power projects, licensing and permitting, energy trading, and regulatory compliance.'
- 'The energy and natural resources practice is recognised for its comprehensive industry knowledge and ability to deliver practical, commercially focused advice across the entire energy value chain. The team advises major domestic and international clients on regulatory compliance, project development, M&A, financing, and energy trading matters.'
- 'The team is professional and prompt, consistently providing support exactly when it is needed. They resolve every issue in a timely manner, demonstrating both reliability and efficiency. We truly value their ability to combine professionalism with responsiveness, ensuring that requests are addressed quickly and effectively.'
- 'The individuals we work with stand out through their professionalism, promptness, and commitment. We have particularly valued their responsiveness, reliability, and the confidence they inspire by resolving matters efficiently. Their dedication ensures that our requests are always handled quickly and effectively, which makes them a trusted partner to us.'
- I enjoy working with the lawyers at Kambourov; they are very knowledgeable about the peculiarities of Bulgarian construction law and the various permitting processes, which would be absolutely impossible to navigate without them.
Key clients
- Kozloduy Nuclear Power Plant (NPP) – New Build EAD
- Enerjisa Commodities B.V.
- Balkan Logic
- MVM Partner Zrt.
- Trafigura Nat Gas Limited
- Tessa Energy
- Gastrade SA
- NEPI Rockcastle/Sofia Commercial Centre EOOD
- United Group
- А29 Energia Bulgaria EOOD
- Uniper Global Commodities SE
- SD Gas & Power S.R.L.
Work highlights
Advising Kozloduy NPP – New Build EAD on the development of Bulgaria’s second nuclear power plant, a €14bn project involving two 1000 MW reactors using AP1000® technology, to be constructed by Westinghouse and Hyundai.
Assisted Metlen with its acquisition of a 75% stake in Most Energy JSC’s energy trading business, a key step in Metlen’s regional expansion.
Advising Balkan Logic, a Bulgarian energy company, on the acquisition of a 70 MW wind energy project in Strazhitsa.
Lawyers
Hall of Fame
The lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.

Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Practice head
Stefan Tzakov
Other key lawyers
Irena Petkova

