Possible Clues:

• Angola joined it in '07
• Grp. with crude interests?
• Crude gp
• Gp. that includes the UAE and Gabon
• Powerful energy-market gp.
• Grp. that rolls out the barrels?
• Acronym for countries exporting petrol
• Grp. created at the Baghdad Conference, 1960
• Powerful energy cartel
• Worldwide oil power