(Recasts, adds details, comments throughout.)

By Alexis Flynn

LONDON--Shah Deniz, the consortium developing a natural-gas field offshore Azerbaijan, has finalized its options to carry that gas to Europe down to two rival proposals, the penultimate decision in a years-long process that is key for Europe's strategy of diversifying energy supplies.

BP PLC (BP) and its partners in the Shah Deniz gas field said Thursday they have selected the Nabucco West pipeline concept over the BP-backed South East Europe Pipeline as one of the two final options to be considered when the consortium decides on a route to pipe Caspian gas to Europe next year.

The issue of natural-gas transportation from the Caspian to Europe is key for the European Union's aim of opening a "corridor" from Central Asia, across Turkey, and getting new suppliers in an energy-rich region to ease its dependence on Russia's natural gas.

Nabucco West will now be paired off in a two-horse race with the Trans-Adriatic Pipeline, known as TAP, for the right to export gas from the giant Shah Deniz development offshore Azerbaijan. A final decision on whether to pipe the gas through a northern route to Central Europe, provided by Nabucco, or through TAP's southern route through Italy, is due in 2013.

Nabucco is a joint venture involving Germany's RWE AG (RWE.XE), Austrian oil firm OMV AG (OMV.VI) and Hungary's Mol Nyrt. (MOL.BU). Other partners include Bulgargaz EAD, Transgaz SA and Boru Hatlari ile Petrol Tasima AS. TAP, meanwhile, is backed by EGL AG, Statoil ASA (STO) and E.ON Ruhrgas AG.

"This represents another important milestone in the development of Shah Deniz Stage 2 and the transportation of gas resources from the Caspian to Europe," said BP regional head, Rashid Javanshir.

Separately, Nabucco's managing director, Reinhard Mitschek, said: "Nabucco delivers freedom of choice to gas consumers and will contribute considerably to the security of supply in Europe. We look forward to a successful cooperation with the producers."

Thursday's decision mirrors a parallel move in February to narrow down the various pipeline options when the Interconnector Turkey-Greece-Italy, or ITGI, concept was excluded in favor of TAP.

EU Energy Commissioner Gunther Oettinger welcomed the news, saying it represented "a success for Europe and for our security of supply."

The EU-championed Nabucco concept has had to scale back its ambitious plans for a 3,900 kilometer long pipeline from the eastern border of Turkey to Austria. But fierce competition from the rival proposals and lingering questions about finding adequate natural gas supply to fill the line led to the consortium announcing the truncated Nabucco West concept in May.

BP, which plays a pivotal role in Shah Deniz, has said it will invest in TAP "to provide funding in the short term", a move that some have interpreted as a sign that it prefers the Southern Corridor route. However, the company has stressed that it remains committed to the selection process that could ultimately see Nabucco West prevail.

(Alessandro Torello and Jan Hromadko contributed to this report.)

Write to Alexis Flynn alexis.flynn@dowjones.com

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