A detail view of NRG Power2Serve signage is seen at the unveiling of the NRG Power2Serve disaster relief vehicle at Reliant Center on Tuesday June 18, 2013 in Houston, Texas. (Aaron M. Sprecher/AP Images for NRG)

Associated Press
A detail view of NRG Power2Serve signage is seen at the unveiling of the NRG Power2Serve disaster relief vehicle at Reliant Center on Tuesday June 18, 2013 in Houston, Texas. (Aaron M. Sprecher/AP Images for NRG)
A detail view of NRG Power2Serve signage is seen at the unveiling of the NRG Power2Serve disaster relief vehicle at Reliant Center on Tuesday June 18, 2013 in Houston, Texas. (Aaron M. Sprecher/AP Images for NRG)
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