The Syrian government has reportedly bought oil directly from ISIL,[11][12] and the Syrian government and ISIL jointly ran a HESCO gas plant in Tabqah. The facility supplied electricity to government-held areas, while government-run power plants supplied ISIL-held areas.[13] A report on 25 June 2015 said that ISIL kept gas flowing to Assad regime-controlled power stations. Furthermore, ISIL allowed grain to pass from Rojava to government-controlled areas at the cost of a 25% levy.[14] In 2017, US and European officials said that oil sales to the Syrian government were ISIL's largest source of revenue.[15][16]