With the world's fifth-largest estimated shale gas reserves, there is great potential for Saudi Arabia to replicate North America's unconventional growth. Saudi Aramco's unconventional program became operational in 2013 and the company has been working with major service companies, including Halliburton and Schlumberger, to develop the reserves. The primary driver is the country's pressing need to find new supplies of gas to replace the domestically produced crude oil used to generate most of its electric needs, demand that can reach as high as 900,000 B/D in summer. Another major aim is to use unconventional gas to bolster the country's growing petrochemical industry. Ali Almomen, an unconventional gas production engineer at Saudi Aramco, said the company has completed the exploration and appraisal phases of its derisking strategy and is in the middle of various pilot stages.