Cramer's lightning round: NRG Energy is a buy

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Cramer's lightning round: NRG Energy is a buy

“Mad Money” host Jim Cramer rings the lightning round bell, which means he’s giving his answers to callers’ stock questions at rapid speed. www.cnbc.com

“Mad Money” host Jim Cramer rings the lightning round bell, which means he’s giving his answers to callers’ stock questions at rapid speed.

www.cnbc.com