June 5 Ex-Soviet Azerbaijan will potentially become an important supplier of natural gas to European markets when it launches the second phase of its Shah Deniz field, as well as other projects in the Caspian Sea.
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Following are some pipeline supply routes proposed for the delivery of Azeri natural gas.
* Nabucco aims to reduce Europe's dependence on Russian gas. A pricing dispute between Russia and transit country Ukraine left European customers without supply for two weeks in January, adding urgency to the project.
* Nabucco is a 7.9 billion euro ($11.2 billion) project to transport gas from Turkey to Austria through Bulgaria, Romania and Hungary. Azerbaijan is only one potential source of gas.
* Construction of the 3,300-km (2,050-mile) pipeline is scheduled to start in 2011 and first deliveries are expected in 2014 with initial annual capacity of 8-10 billion cubic metres.
* Market studies show the pipeline has been designed to transport a maximum of 31 billion cubic metres of gas annually.
* Austrian oil and gas group OMV (OMVV.VI) heads the consortium, which also includes Hungary's MOL MOLB.BU, Turkey's Botas, German utility RWE AG (RWEG.DE), Romania's Transgaz TGNM.BX and Bulgargaz EAD of Bulgaria.
TRANS ADRIATIC PIPELINE (TAP)
* TAP, at 520 km (325 miles), is the shortest pipeline route, running from near Thessaloniki in Greece, through Albania and under the Adriatic Sea to come ashore in Italy, near Brindisi.
* The estimated cost of the project is 1.5 billion euros ($2.1 billion), subject to material and labour costs.
* TAP will initially have capacity of 10 billion cubic metres per year but could be expanded to 20 bcm a year.
* TAP is a 50-50 joint venture between StatoilHydro (STL.OL) of Norway and Swiss firm EGL EGL.S.
INTERCONNECTOR TURKEY-GREECE-ITALY (ITGI)
* The ITGI project will utilise parts of the existing pipeline infrastructure and will include construction of a 600-km (375-mile) section in Greece and a 200-km (125-mile) section beneath the Adriatic Sea.
* The estimated cost of the project is 1.2 billion euros ($1.7 billion). It aims to deliver approximately 10 billion cubic metres a year of Caspian Sea basin and Middle Eastern gas.
* The onshore section in Greece would run from Komotini to the coast in Thesprotia, where it would feed into the Poseidon pipeline running under the Mediterranean Sea to southeast Italy.
* The undersea section would be laid by a joint venture between Italy's Edison EDN.MI and state-owned Greek hydrocarbon company DEPA.
* Russian state-controlled gas export monopoly Gazprom (GAZP.MM) has previously offered to purchase all of the gas from the second phase of Shah Deniz.
* Gazprom and Italian energy firm Eni (ENI.MI) plan to build the South Stream pipeline to take Russian gas under the Black Sea to southeast Europe, avoiding Ukraine. This project is seen as a rival to the Nabucco pipeline, which Russia has said is not necessary.
Both Georgia and Iran have also offered to purchase output from the second phase of Shah Deniz, said the vice-president for investment and marketing at Azeri state oil firm Socar, Elshad Nasirov. (Editing by Sue Thomas)