TPAO's Black Sea Expansion: Strategic Energy Alliance Forged in Bulgaria

Turkish Petroleum Overseas Company Limited (TPOC), the international arm of the Turkish Petroleum Corporation (TPAO), has taken a critical step towards strengthening its strategic position in Bulgaria's exclusive economic zone of the Black Sea, marking a significant move for regional energy supply security. By acquiring a portion of Shell's rights and obligations, the company has signed off on a new partnership structure in the Han Tervel Block 1-26 field.

Shifting Power Dynamics in Han Tervel Block: The Shell and TPOC Alliance

The transfer process, officially approved by the Council of Ministers of Bulgaria, reveals a new model of collaboration among international energy giants. The partnership structure of the license field has solidified as follows based on the strategic weight of the stakeholders:

■Shell Exploration and Production: Retaining operational leadership and remaining the largest partner with a 42% stake.

■Turkish Petroleum Overseas Company Limited (TPOC): Entering the field as TPAO's international wing with a 33% stake.

■OMV Petrom: The Romania-based energy company holds a 25% share within the consortium.

The Han Tervel Block 1-26 field originally came to the agenda with a contract signed with Shell in December 2025 and underwent its first structural change in April 2026 with the entry of OMV Petrom. With TPOC's inclusion, the oil and natural gas exploration potential in the field will now be managed by a tripartite mechanism.

Strategic Depth: The NATO-Financed Energy Corridor

In addition to exploration activities, another development concerning the infrastructure security of the region came from the Bulgarian government. Bulgartransgaz has been authorized to conduct pre-feasibility studies for a NATO fuel pipeline that will connect Greece and Turkey to Romania via Bulgaria. The strategic importance of the project is reflected in its funding sources:

■The 10 million euro cost of the pre-feasibility study will be covered by NATO.

■This line is positioned not merely as a commercial pipeline but as an integral component of regional defense and logistical energy security.

This move indicates that Turkey's strategy for energy supply diversification is not merely about gaining operational capability beyond borders, but also serves as an intelligent hedge mechanism to disperse geopolitical risks. TPOC's presence in the Black Sea should be assessed as a leverage that will increase Ankara's bargaining power in discussions regarding Europe's energy supply security. Furthermore, the NATO-backed pipeline project serves as a tangible example of how deeply energy infrastructure is intertwined with security strategies.