Mazarine Energy to Acquire Romania’s Black Sea Oil & Gas as Carlyle, EBRD Exit
Mazarine Energy, a privately held Netherlands-based exploration and production company, has agreed to acquire Black Sea Oil & Gas (BSOG), Romania’s largest offshore gas producer, as existing backers Carlyle and the European Bank for Reconstruction and Development (EBRD) exit their stakes, according to Offshore Energy, which first reported the deal on October 30. The transaction is subject to customary regulatory approval, and neither the purchase price nor the size of the stakes changing hands has been disclosed.
Operator Stays the Same, Ownership Changes
Offshore Energy reported that BSOG will remain the operator of the Midia Gas Development (MGD), the offshore-to-onshore gas project that has anchored the company’s business since it came online. The deal is a change of shareholders, not a change of who runs the asset day to day: MGD’s offshore “Ana” platform, its 126-km subsea pipeline and the onshore Vadu gas treatment plant all continue under BSOG’s operatorship.
Mazarine’s chief executive, Edward van Kersbergen, framed the deal as a deepening of a presence the company has built since it first entered the Romanian market. “Romania has been a core part of Mazarine’s business since 2017, and we are proud to build on that presence with BSOG,” he said.
Midia’s Place in Romania’s Gas Supply
MGD represents more than $400 million of investment and has been producing since June 2022. According to Offshore Energy’s reporting, the project now delivers more than 100 million standard cubic feet per day (MMscf/d) — equal to 11.8% of Romania’s total gas production in the first half of 2026, based on figures from ANRE, the country’s energy regulator. That makes BSOG a material contributor to domestic supply at a time when Black Sea gas development has become a recurring feature of Romania’s energy strategy, alongside larger offshore projects further along the coast.
Why Carlyle and the EBRD Are Stepping Back
The EBRD has been a BSOG shareholder since 2017, when the bank first disclosed taking a stake in the project as part of its early-stage financing. That arrangement — a specialist operator running the field while private equity and a development bank supply capital — is a common structure for frontier offshore gas developments, where sponsors often look to rotate out of an asset once it reaches stable production, freeing capital for new projects elsewhere. Offshore Energy’s report did not specify the banks’ current ownership percentages or the reasoning behind the timing of the exit beyond describing it as a sale process now reaching completion.
What Happens Next
With the transaction still pending regulatory sign-off, the near-term operational picture at Midia is unlikely to change: BSOG keeps running the Ana platform and the Vadu plant, and current offtake arrangements are expected to continue. The bigger question is what a Mazarine-controlled BSOG does with the asset longer term, including whether further investment is directed toward extending MGD’s producing life or expanding into adjacent Black Sea acreage — details that have not yet been addressed by either company.
Sources
- Offshore Energy, Melisa Cavcic, “Mazarine taking the helm at Black Sea Oil and Gas as Carlyle and EBRD exit,” 30 October 2026, https://www.offshore-energy.biz/2026/10/30/mazarine-taking-the-helm-at-black-sea-oil-and-gas-as-carlyle-and-ebrd-exit (deal terms, MGD production figures, CEO quote)
- European Bank for Reconstruction and Development, 2017 press release on its original investment in Black Sea Oil & Gas, ebrd.com (background on EBRD’s 2017 entry as a BSOG shareholder)
Illustrative image. Photo: GuavaTrain, CC0, via Wikimedia Commons — source
