Lightning Round: Love the concept, hate the stock

It's that time again! The Lightning Round bell has rung, and Jim Cramer gives his take on a few favorite audience stocks:

NiSource Inc: "I've been a fan but remember with interest rates going higher, no one is going to buy this one so you are going to have to be able to say don't buy right now until the yield goes higher."

Clean Energy Fuels Corp: "I do not like the stock. I like the concept. The concept seemed great to me, which is natural gas fueling stations. But it has not taken off, and the country is not ready for it yet."

Halozyme Therapeutics Inc: "We have liked Halo and we think that it is a terrific individualized immunotherapy company....I will say this—52-week high. You've got to be very careful, I think biotech is a little overheated here after the Receptos bid.".

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Vanguard Natural Resources: "Too risky! When I see that 10 percent yield, I say red flag. And particularly for a natural gas company where prices are very low."

American Electric Power Co: "I think it's fine. Remember if interest rates go up, no one is going to want a 4 percent yield and that is what that has. But it is a very fine company."

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