By steve raabe The Denver Post -Denver-based solar power firm SunShare is looking at brighter prospects with a big financial boost from utility powerhouse NRG Energy.On Wednesday, the companies announced a deal enabling SunShare to grow its community solar portfolio about eightfold.Under the transaction, Scottsdale, Ariz.-based NRG Renew, a subsidiary of NRG Energy, will finance the $25 million development of five new "solar garden" projects: four in the metro Denver area and a 2-megawatt one in Colorado Springs.In exchange, NRG will receive what SunShare describes as a "significant" equity position in the projects.