During the progression of NTEAP implementation, NBI relations between member-states have become increasingly strained.
Historically, Egypt and Sudan have commanded 85% and 15% of the rights to Nile resources respectively. This deal emerged after a 1959 agreement known as the Nile Treaty despite the flow of the Nile through several other countries. In addition, Egypt maintains the right to veto any development or resource extraction anywhere upstream (even outside of Egypt's borders).
Most recently exposed during a July 2009 meeting of the Riparian states in Alexandria Egypt, Egypt has continued to exacerbate this issue by reasserting its claims for more control of the Nile's resources in an increasingly unilateral fashion. Tensions surrounding Egypt's demands have left in doubt the future stability of the NBI itself and, by consequence, the effectual impact of NTEAP implementation.
Following is Al Jazeera video on Egyptian tension with other Nile Basin states: http://www.youtube.com/watch?v=RDPodDJceUw