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With NRG Energy’s announcement on Tuesday that it will invest $450 million investment in a California photovoltaic project, the New Jersey-based power provider has pledged a total of $750 million for big solar plants in the past two months.

A new report from GTM Research indicates why NRG sees such sunny prospects for the solar business. According to the researchers, utilities in the United States already have signed contracts for 5,400 megawatts’ worth of photovoltaic power plants that will be built by 2014 with another 10,100 megawatts in negotiation.

The U.S. utility-scale photovoltaic market is expected to grow from $1 billion in 2010 to $8 billion by 2015, the report said.

“The global PV industry is increasingly turning its attention toward the U.S. utility PV market as a driver of global demand over the next five years,” the report’s authors wrote. “Indeed, conditions appear right to support massive growth.”

That growth is being driven by a 50 percent fall in the price of photovoltaic modules since 2009 as well as state mandates that require utilities to obtain a certain percentage of their electricity from renewable sources.