Key Speakers At IHS CERAWeek 2015 Energy Conference

Thad Hill, president and chief executive officer of Calpine Corp., from left, Leo Denault, chief executive officer of Entergy Services Inc., and Patricia "Pat" Vincent-Collawn, chairman and chief executive officer of PNM Resources Inc., participate in a panel discussion during the 2015 IHS CERAWeek conference in Houston, Texas, U.S., on Thursday, April 23, 2015. CERAWeek 2015, in its 34th year, will provide new insights and critically-important dialogue with decision-makers in the oil and gas, electric power, coal, renewables, and nuclear sectors from around the world. Photographer: F. Carter Smith/Bloomberg via Getty Images