The survey asked potential shippers to declare their interests on a nonbinding basis, said Nabucco, which is led by Austrian oil and gas group OMV.
It was done last month in preparation for the more formal open season process, in which customers make binding bids for capacity.
"More than 100 percent overbooking from day one in 2013 shows huge demand for the provided Nabucco capacities on a strong growing gas market," Nabucco managing director Reinhard Mitschek said in a statement Monday.
Nabucco said the open season process would start once the legal framework for Nabucco was established.
The planned 3,300-kilometer pipeline still needs to win exemption from European Union anti-monopoly rules and an agreement among the governments whose countries the pipeline will go through.
Nabucco's shareholders are OMV, Hungary's MOL, Romania's Transgaz, Bulgaria's Bulgargaz, Turkey's Botas and Germany's RWE. The pipeline is expected to cost 7.9 billion euro ($11.8 billion).
A Message from The Moscow Times:
Dear readers,
We are facing unprecedented challenges. Russia's Prosecutor General's Office has designated The Moscow Times as an "undesirable" organization, criminalizing our work and putting our staff at risk of prosecution. This follows our earlier unjust labeling as a "foreign agent."
These actions are direct attempts to silence independent journalism in Russia. The authorities claim our work "discredits the decisions of the Russian leadership." We see things differently: we strive to provide accurate, unbiased reporting on Russia.
We, the journalists of The Moscow Times, refuse to be silenced. But to continue our work, we need your help.
Your support, no matter how small, makes a world of difference. If you can, please support us monthly starting from just $2. It's quick to set up, and every contribution makes a significant impact.
By supporting The Moscow Times, you're defending open, independent journalism in the face of repression. Thank you for standing with us.
Remind me later.