A huge solar-infrastructure expansion is under way in the desert Southwest, with nine multibillion-dollar solar plants scheduled for construction -- but experts say that without continued government investment, the new projects could be the last for a while. Two key federal incentive programs expire this year, and it's unclear whether either will be renewed. "I think we're going to see a burst of projects over the next two months and then you're going to hear the sounds of silence," says David Crane, CEO of NRG Energy.

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