In Saudi Arabia, we manage a downstream network that encompasses gas fractionation, refining, distribution, power generation that efficiently supports our operations, and to create favorable conditions for investment and growth.
Within this system are the Sadara chemicals joint venture and Petro Rabigh (an integrated refining and chemicals company), eight refineries (three wholly owned), 23 bulk plants, two international airport refueling sites, more than 21,000 km of pipelines, and 20 export berths at six marine ports, including the Port of Ras Tanura — the world’s largest group of crude oil export terminals.
We partner with world leading refining and chemicals companies in Saudi Arabia to produce a slate of products for domestic and international customers, generating greater value from our resource base and expanding market opportunities for our products with conversion industries and manufacturers. We are the sole supplier of refined products to the large and growing domestic market. And because our upstream operations supply crude oil directly to our domestic refining system through our extensive pipeline network, we optimize supply costs.
Our investments in power, which primarily support our upstream and downstream operations, seek to achieve economies of scale by considering adjacent demand centers and capturing opportunities for advantaged fuels. In addition, our strategy is to identify opportunistic growth in the domestic power market.
We continued to transform our power business from dependency on third parties to self-sufficiency in electricity and cogenerated steam, while maintaining a steadfast concentration on safety, reliability, and energy efficiency. In 2017, we maintained self-sufficiency in power generation, with excess power exported to the national grid under a commercial agreement. Company power efficiency reached 67% by year-end, an improvement of 1% over the previous year.
In 2017, we created Aramco Power. Its establishment advances the transformation of the company’s power business to a sustainable commercial business through the generation of service and trading revenues.
The joint venture power cogeneration facilities at our Hawiyah Gas Plant, Abqaiq Plants, and Ras Tanura Refinery were operational in 2017. In addition, the construction progress on the cogeneration facility integrated with our Fadhili Gas Plant reached 51% at year-end.