On CNBC's "Mad Money Lightning Round," Jim Cramer said he likes NRG Energy, Inc. NRG, adding that it's a "very good" utility. Lending support to his choice, Goldman Sachs analyst Carly Davenport initiated coverage on NRG Energy with a Buy rating and announced a price target of $129. "You can't own it like you used to, meaning you have to trim, and I said I'm going to have to sell some," Cramer said when asked about NVIDIA Corporation NVDA. "It's a different world." On Tuesday, Nvidia said it would take a$5 ...