Cramer's lightning round: NRG Energy is a buy

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

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NRG Energy Inc: "I still like it. I am a buyer of NRG."

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Science Applications International Corp: "Excellent consulting company. Maybe I'd wait a little ... for it to maybe go down a little bit before I get involved."

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Annaly Capital Management Inc: "I'm not going to recommend that stock."

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Sportradar Group AG: "I do not know that company."

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Enphase Energy Inc: "It is too expensive. ... We've got better stocks."

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