Department profile
CMS

Energy

Europe Guide 2026 : Bulgaria

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CMS

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About

Provided by CMS

Energy has been a top practice area for CMS Sofia ever since we opened our office in Bulgaria in 2005. We have prominent experts specialising in all aspects of the energy legal practice. We consider ourselves the dominant law firm on the Bulgarian legal market in renewables, upstream oil & gas, nuclear energy, mining, environment, regulatory and trading, and projects. Our advice covers all relevant areas, including assistance throughout incorporation and continuing with advice on the construction and purchase of facilities, technical approval and environmental questions, network operation issues and strategic considerations in handling the projects. We advise Bulgarian energy and infrastructure companies and our team has strong relationships with many prominent international clients.

Clients (24)

  • Arkad
  • Espe Energy
  • Rosatom
  • Iberdrola
  • CEZ
  • EVN
  • Toshiba
  • Veolia
  • Global Biomet
  • Shell
  • OMV Petrom
  • Repsol
  • Petroceltic
  • SPM
  • SDN Company
  • Efacec
  • Astronergy
  • Acwa Power
  • Enel Green Power
  • Samsung
  • The Bulgarian Wind Association
  • The Association of the Producers of Ecological Energy
  • China Communications Construction Company
  • Bombardier Transport

Industries (12)

  • Aerospace & Defence
  • Automobiles & Parts
  • Banks
  • Construction & Materials
  • Energy
  • Financial Services
  • Government
  • Industrial Engineering
  • Mining & Metals
  • Real Estate
  • Transportation
  • Utilities

Chambers Review

Provided by Chambers

Energy - Bulgaria

Band 1

What the Team is Known For
CMS has an outstanding practice delivering specialist knowledge across the full spectrum of transactional and regulatory mandates in Bulgaria's energy sector. The top-tier team assists with the financing, construction and management of photovoltaic and wind power projects. CMS also enjoys a superb reputation for work in the upstream oil and gas sector, acting for leading energy companies on tender bids and related permitting issues arising for gas exploration or transport projects. Its extensive network within CEE and cross-border expertise attract major international clients. The firm's portfolio also features acting on both sides of public procurement processes and energy-related arbitrations.
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Strengths

Provided by Chambers

  • CMS is exceptionally well connected and has supported us far beyond the traditional scope of legal counsel.

    Energy respondentEurope

  • CMS has extensive experience, follow the developments of the regulatory framework closely and have established working relationships across the stakeholders in the sector.

    Energy respondentEurope

Notable Practitioners

Provided by Chambers

  • Kostadin Sirleshtov
    Kostadin Sirleshtov

    Kostadin Sirleshtov

    Kostadin Sirleshtov is a stellar figure in the sector. His longstanding expertise spans transactional and regulatory matters relating to large energy projects.

    • Kostadin Sirleshtov has vast expertise in energy projects and a very good grasp of the broader socio-political and economic context in which energy projects are developed.

      Energy respondentEurope

    • Kostadin is the best energy lawyer in Bulgaria.

      Energy respondentEurope
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  • Dimitar Zwiatkow
    Dimitar Zwiatkow

    Dimitar Zwiatkow

    Partner Dimitar Zwiatkow notably advises clients on mandates related to renewables, combined heat and power, waste to energy and independent power projects. He is particularly active supporting clients with the financing aspects of energy projects and mandates.

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Ranked Individuals at CMS (2)

Bulgaria

Members

Provided by CMS

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