Türkiye’s Gas Diversification Runs Into Iran Risk as Caspian Energy Map Shifts
By Bosphorus News Energy Desk
Türkiye's search for gas diversification is entering a more difficult phase as its long-term Iran gas contract approaches expiry in July 2026 and Central Asia's energy map begins to move in directions Ankara does not fully control.
The pressure is no longer confined to the BOTAŞ-Iran contract. Türkmen gas has already entered the Turkish supply debate through an Iranian swap route, while Kazakhstan, Azerbaijan and Uzbekistan are building a separate green electricity corridor across the Caspian. One track touches Türkiye's gas security directly. The other does not include Ankara as a formal party, but it changes the energy geography around Türkiye.
Türkiye's Ministry of Energy and Natural Resources announced on Feb. 11, 2025 that BOTAŞ, Türkiye's state-owned Petroleum Pipeline Corporation, and Türkmengaz, Turkmenistan's state gas company, had reached an agreement to supply Türkmen gas to Türkiye. The ministry said flows were planned to begin on March 1, 2025.
Energy Minister Alparslan Bayraktar called the agreement "a historic step" in Türkiye-Turkmenistan energy cooperation. He said it would "strengthen the natural gas supply security of our country and our region," while advancing strategic cooperation between Ankara and Ashgabat.
BOTAŞ later framed the first arrival of Türkmen gas in Türkiye as a milestone. Its general manager, Abdulvahit Fidan, described it as "the realization of a 30-year dream," while stressing that long-term and larger-scale supply from Turkmenistan remained the next objective.
The route, however, did not give Türkiye a clean bypass around Iran. Türkmen gas reached the Turkish system through a swap mechanism: gas delivered to northern Iran by Turkmenistan, with an equivalent volume sent to Türkiye through the existing Iran-Türkiye gas network.
That arrangement adds flexibility, but it also carries the same political exposure Ankara is trying to reduce. Any pressure on Iran-linked swap mechanisms, sanctions enforcement, contract disputes or regional escalation involving Tehran can affect the route. Türkmen gas therefore strengthens Türkiye's supply options without removing Iran from the middle of the equation.
The fragility became clearer after the pilot flow was reported to have been suspended during contract negotiations. That does not erase the significance of the route. It does show that volume, pricing, transit terms and political confidence remain unresolved between Ankara, Ashgabat and Tehran.
The timing gives the issue greater weight. Türkiye's 25-year gas contract with Iran, signed between BOTAŞ and the National Iranian Gas Company, covers up to 9.6 billion cubic meters a year through the Tabriz-Ankara pipeline. As the July 2026 deadline approaches, Ankara has more alternatives than it once had, but eastern supply security and winter demand still make Iranian pipeline gas difficult to dismiss.
Türkmenistan also has reasons to look west. Its gas exports remain heavily tied to China, while Ashgabat continues to search for additional outlets through Iran, across the Caspian or toward Europe. Türkiye's demand for diversification and Türkmenistan's need for export options overlap, but geography still blocks the easiest answer. Central Asian gas cannot reach Türkiye at scale without either Iranian transit or a larger Trans-Caspian route.
Bayraktar has previously pointed to a Caspian route as the longer-term objective. Such a route would move the discussion beyond swap arrangements and toward a direct link through Azerbaijan, then onward to Türkiye and Europe. The idea has been discussed for years, but Russian and Iranian objections, cost, legal constraints and financing problems have kept it from becoming a working gas corridor.
While the gas route remains uncertain, another Caspian energy line is becoming more formal. Kazakhstan, Azerbaijan and Uzbekistan are advancing a green energy corridor designed to carry renewable electricity across the Caspian toward Azerbaijan and, eventually, European markets.
The agreement was signed by the three countries' leaders in Baku during COP29 in November 2024. Kazakhstan's lower house approved it on March 11, 2026, and the Kazakh Senate ratified it on April 9, 2026. The project is being developed through the Green Corridor Alliance, a joint venture involving Azerenergy, KEGOC, the Kazakhstan Electricity Grid Operating Company, and the National Electric Networks of Uzbekistan.
The planned system would send green electricity generated in Kazakhstan and Uzbekistan through a high-voltage direct current submarine cable under the Caspian Sea to Azerbaijan. From there, the electricity could connect to the wider Black Sea energy route toward Europe.
Azerbaijan's Energy Minister Parviz Shahbazov called the unification of the energy systems of Azerbaijan, Uzbekistan and Kazakhstan "a strategic and historically important project." He said the initiative would allow Azerbaijan and Central Asia to realize "the first trans-Caspian Energy Corridor."
That phrase carries strategic weight. The corridor is not a Turkish project, and it does not place Ankara at the center of the new green electricity route. But it shows that the Caspian is no longer being shaped only through gas, oil and rail logistics. Electricity transmission, renewable exports and Europe-facing infrastructure are becoming part of the same map.
The project also strengthens Azerbaijan's role as the bridge between Central Asia and Europe. That matters to Ankara because Türkiye's wider energy and connectivity policy already depends on Azerbaijan, the South Caucasus and the Middle Corridor. A Caspian green electricity route that reaches Europe through Azerbaijan, even without Türkiye as a formal participant, still affects the strategic environment in which Ankara builds its own energy diplomacy.
The institutional base is also more serious than many earlier Caspian energy ideas. The feasibility process is supported by international institutions, including the Asian Development Bank and the Asian Infrastructure Investment Bank. CESI, the Italian energy consultancy and engineering company, is involved in the technical work. That gives the project a clearer investment frame than older concepts that remained trapped in political language.
Türkiye now faces an energy diversification problem with several layers. LNG gives Ankara flexibility, but leaves it exposed to prices and maritime risk. Iranian gas provides pipeline continuity, but carries political and sanctions exposure. Türkmen gas adds a Central Asian supply option, but remains tied to Iranian transit unless a larger Caspian route emerges. The green corridor does not solve Türkiye's gas problem, yet it shows how Central Asia's links to Europe are expanding beyond hydrocarbons.
The Türkmen gas and Caspian green corridor files point to the same shift. Central Asia is becoming a corridor space rather than only a reserve basin. Gas, electricity, digital infrastructure, rail lines and ports are moving into a single strategic conversation about access to Europe and reduced dependence on any single gatekeeper.
Türkiye has real advantages in that contest: pipelines, LNG terminals, access to European markets, ties with Azerbaijan, a growing role in the Organization of Turkic States and a geographic position that still makes it one of the most practical land bridges between Asia and Europe.
Geography, however, does not guarantee control. The Caspian green corridor shows that new energy routes can develop around Türkiye as well as through it. Türkmen gas shows that even useful diversification tools can carry the Iranian risk Ankara is trying to reduce.
The July 2026 Iran deadline is therefore only one part of the wider test. Ankara must decide how to manage Iranian pipeline gas, how far Türkmen supply can be scaled, and how Türkiye should position itself as the Caspian energy map expands from gas into electricity, green infrastructure and Europe-facing corridors.
Türkmen gas gives Türkiye a foothold in Central Asian supply. The Caspian green corridor shows that the map is moving beyond gas diplomacy alone.
***Sources: Türkiye Ministry of Energy and Natural Resources, Feb. 11 and Feb. 12, 2025; BOTAŞ, October 2025; Reuters, Feb. 11, 2025 and April 16, 2026; OSW Centre for Eastern Studies, Feb. 20, 2025; Azerbaijan Ministry of Energy; Kazakhstan Senate and Kazakh parliamentary records, March-April 2026; Asian Development Bank; Asian Infrastructure Investment Bank; CESI; Bosphorus News reporting.