Warren Buffett has been in the news a lot lately for all kinds of things, but the media has mostly overlooked the fact that the uber-investor is also making big green moves. While T. Boone Pickens has been screaming about wind power from the rooftops, Buffett, through his MidAmerican utility (which he owns via his Berkshire Hathaway holding company), has been making big investments in wind power, enough to become the #1 utility in the U.S. when it comes to wind. MidAmerican will have 2,909 megawatts of wind generation in operation by the end of 2011, more than any other regulated electric utility in the country. The total amount that MidAmerican has invested or committed to wind is a staggering $5.4 billion. We can make this sort of investment because MidAmerican retains all of its earnings, unlike other utilities that generally pay out most of what they earn.