With South Stream Russia is looking a more reliable route for its gas exports to Europe as it bypasses Ukraine and Belarus, where price disputes have in the past led to gas shortages. EU Commission tries with Nabucco provide a supply of gas not subject to Russian control.
The competition over gas is coming harder. In my article "New Player in Caspian Sea Power Corridor" I described how China has came to game to take big share of Turkmenistan gas.
For contest between EU’s Nabucco and Russia’s South Stream China’s actions favor later. Today’s arrangements are securing gas for South Stream while Nabucco still is searching supply. It is more clear that Nabucco should be filled with Iraqi and/or Iranian gas and political aspects related to this may delay finding(private) investors and the implementation of project as whole. In bottom line while Russia is taking its part from old gas fields and China from old and new gas fields the Nabucco pipe still is more than half empty.
More about this comparison one may find from my post "EU's big choice - Nabucco or South Stream?".
From 2015 South Stream is scheduled to take gas into the EU via Bulgaria. A northern branch ends up in Italy via Serbia, Hungary, Slovenia and eventually Austria. A southern route takes the gas through Greece and under the Adriatic Sea to Italy. With Slovenia Russia has all the necessary European partners for us to be able to complete its project. During Summer 2009 there was discussions if South Stream could pass Bulgaria. Russia however agreed on 6th August 2009 with Turkey about energy cooperation with South Stream and also development of Blue Stream pipeline between Russia and Turkey under Black Sea so South Stream has secured also an alternative route. After that the discussions between Bulgaria and Russia got a new boost.
Austria has officially backed Nabucco even some of Austrian companies are also partners in South Stream. On 11th Nov. 2009 Russia and Austria had meeting. PM Putin said after talks with Austrian Chancellor Werner Faymann that they agreed to draft an agreement on cooperation in South Stream. Faymann said South Stream is in Austria's interests and that Austria's government had given a mandate to start negotiations two weeks ago. He said Nabucco and South Stream shouldn't be viewed seen as competitors: "We believe that this is diversification as well as a chance to make the energy supply more secure," Faymann said. More in CNBC news.
Russia made already on May 2009 a proposal including the South Stream gas pipeline to pump natural gas from Russia to the Balkans and onto Europe in a list of EU priority projects. The U.S./EU backed Nabucco project had been included in the list, but South Stream not yet. From my point of view I would like to see EU to change priority status from Nabucco to South Stream. Nabucco could still be kept alive in case to wait stabilisation in the Middle-East.