The Türkiye-Bulgaria energy relationship is moving beyond bilateral gas trade into a broader corridor strategy covering gas transmission, renewable electricity, interconnectors and regional security. Turkish Foreign Minister Hakan Fidan described increased gas transmission capacity from Türkiye to Bulgaria as strategically important not only for the two countries, but for the energy security of Eastern Europe. That statement captures a wider shift in SEE: Türkiye is becoming both a gas gate and a power-system partner.
The existing infrastructure is not sufficient for the region’s rising energy-security demands. Ankara and Sofia are working to update the BOTAS–Bulgargaz agreement under what Fidan called a “win-win” principle. The aim is a more comprehensive framework covering gas infrastructure expansion and interconnections. This gives Bulgaria a stronger southern supply route and gives Türkiye a larger role in regional gas balancing.
Electricity is becoming equally important. Türkiye and Bulgaria are seeking to finalise new electricity interconnector projects that could raise transmission capacity by 700–1,100 MW. That is a material addition for regional power trade, especially as Bulgaria adds batteries, Romania expands renewables and Türkiye pushes electrification as a strategic demand theme. Higher interconnector capacity would improve cross-border balancing, reduce congestion risk and create new trading optionality between Balkan and Turkish markets.
The green corridor dimension adds another layer. Türkiye, Bulgaria, Azerbaijan and Georgia are discussing the Green Energy Transmission and Trade project, intended to expand renewable electricity transmission and trading opportunities between the Caspian region and Europe. Bulgaria is also separately discussing increased gas imports from SOCAR and investment opportunities linked to Azerbaijan.
For SEE, the Türkiye-Bulgaria axis is not only about molecules and electrons. It is about security architecture. The same corridor that can carry gas, power and renewable electricity also supports supply-chain resilience, NATO-flank stability and reduced exposure to maritime chokepoints. Türkiye’s role as a bridge between Europe, the Black Sea, the Caspian and the Middle East is becoming more practical and less rhetorical.
The commercial opportunity is significant. Gas traders, TSOs, renewable developers and storage operators all benefit from stronger interconnection. But the political complexity is equally high. Türkiye’s scale gives it leverage; Bulgaria’s EU position gives it market access. Their partnership could become one of the defining energy relationships in south-east Europe’s next investment cycle.
