In an 85-page ruling, the Washington-based International Centre For Settlement of Investment Disputes (ICSID) agreed with Venezuela's argument appealing the amount of compensation to the US oil giant, and overturned that part of its 2014 decision.
The ICSID ruling was dated Thursday, but released yesterday.
ExxonMobil originally had sought USD 12 billion in compensation over the loss of what it said it had already invested and what it expected to reap from the Cerro Negro project, which was nationalised in 2007.
The ruling released on yesterday cancels the portion of the original award that dealt with compensation for the Cerro Negro project.
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"As far as we know, this is the largest annulment in ICSID history," said George Kahale III, who represented Venezuela.
"We were always confident in our legal position and are very pleased that the annulment committee agreed."
ExxonMobil did not immediately respond to AFP requests for comment.
Venezuela's oil ministry celebrated what it said was "an incontrovertible legal triumph."
"We reaffirm to ExxonMobil and other international companies our willingness to continue working together on energy projects... Within the framework of national and international law," the ministry said.
Venezuela, which withdrew from ICSID in 2012, still faces a slew of unresolved demands for compensation stemming from a wave of nationalisations during the government of the late president Hugo Chavez.
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