This Engineering Service has built a portfolio for more than 50 years. The first project commenced in 1969, with the installation of the telephone cable network in Saudi Arabia. Elnusa completed the Upgrading of Balikpapan I Refinery at Pertamina RU V Balikpapan in 1994. The duration of the contract was 36 months but the completion was within 32 months, and the plant is still operating now. Elnusa comes with Engineering Service as a form of support for the industry players in the oil and gas industry. The scope of these services includes design planning, material procurement, implementation of the construction of oil and gas installations, both surface and subsurface, as well as testing service to the commissioning/ start-up of the facility constructions. One of Elnusa's other strengths in engineering service is it can provide integrated subsurface to surface engineering work services as a total solution.