The feds on Thursday unveiled guidelines to provide $3 billion in grants for renewable energy projects including solar, wind and biomass. The hope is that the grants will help spur investment in renewable energy projects, but analysts at investment bank ThinkEquity Partners aren’t so optimistic, according to a research note sent to clients Friday. The crux of the problem, according to ThinkEquity, is that developers can’t get approval for the grants until after their project construction is co