The secretive dinner has been held almost annually at the CERAWeek energy conference. This year's event will be the first with Haitham Al Ghais as secretary general for the Organization of the Petroleum Exporting Countries. OPEC had viewed shale as an untamed force that undercut its revenue by bringing vast new oil supplies to market. Fewer OPEC officials are present at this year's annual CERAWeek conferencing, with ministers from key countries including Saudi Arabia and Iraq absent from the attendee list. Reporting by Liz Hampton and Ron Bousso in Houston; additional reporting by Stephanie Kelly Editing by Marguerita ChoyOur Standards: The Thomson Reuters Trust Principles.

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