The world’s most powerful and controversial financial institution describes renewables as one of the biggest profit opportunities in decades.

Goldman Sachs finds this market incredibly compelling,” says Stuart Bernstein, who heads its clean-technology and renewables investment banking group. “It is at a transformational moment in time.”

Despite a recent industry downturn, fewer public subsidies in Europe and a sluggish global economy — not to mention the copious amounts of natural gas and oil becoming available through fracking — chief executive Lloyd Blankfein and his lieutenants believe the time is right to further embrace clean energy.

“We’re