The U.S. is expected to lead the world's mergers and acquisitions in renewable energy for a second year, according to a report from CohnReznick LLP. In vestors include Warren Buffet, and other financial giants. Solar leads the sector with 63 percent of investors targeting solar PV. The biomass and onshore wind sectors make up most of the remaining investment. Bloomberg reports:

Institutional investors are attracted by the large number of operating renewable-energy assets being sold by their original developers, Cohen said. “They know there is only room to increase the installed capacity in the U.S.,” he said.