International energy company ExxonMobil has expanded its five-year renewable fuels agreement with biofuel developer Global Clean Energy Holdings (GCEH), the companies announced on 22 April.

The agreement will see ExxonMobil’s purchases of renewable diesel from GCEH’s Bakersfield biorefinery increase from 2.5M barrels/year to 5M barrels/year.

ExxonMobil will be the exclusive buyer of renewable diesel from the Bakersfield facility in California, which is expected to begin production early next year.

The Bakersfield biorefinery will process up to 15,000 barrels/day of renewable feedstocks, including GCEH’s patented camelina. A range of other non-petroleum feedstocks, including used cooking oil, soyabean oil, distillers’ corn oil would also be used, the companies said.

ExxonMobil said it was planning to distribute the renewable diesel within California and potentially other US and international markets.

GCEH is a leading developer of sustainable, non-food energy crops for use in biofuels and its wholly-owned subsidiary, Sustainable Oils, is a developer of camelina.