American Indian tribes and salmon fishermen sought to win support from Buffett for a proposal to remove four hydroelectric dams from the Klamath River. David Sokol responded on Buffett's behalf, stating that the FERC would decide the question.[162][163]
In December 2011, Buffett's MidAmerican Energy Holdings agreed to buy a $2 billion solar energy project under development in California and a 49 percent stake in a $1.8 billion plant in Arizona, his first investments in solar power. He already owned wind farms.[164]