The GNPOC concession in the Western Upper Nile area includes the large Unity and Heglig oil fields plus smaller fields at El Toor, El Noor, Toma South, Bamboo, Munga and Diffra.

Construction of the 65.72 m (215.6 ft),[2] 18-storey building was finished in 2010 and was designed by KEO International Consultants.

[3] The 14,000 m2 (150,000 sq ft) building housed the headquarters of the Greater Nile Petroleum Operating Company and it was designed by KEO International Consultants.

Canadian company Talisman Energy (previously known as Arakis) was an original stakeholder.

[8] These sanctions were lifted after the Sudanese revolution of 2018/19 and ensuing negotiations between the two governments at the end of 2020.