When the US government stepped in to rescue banks in the 2008 financial crisis it was Warren Buffett's Berkshire Hathaway (NYSE:BRK.A) that invested billions into the likes of Goldman Sachs (NYSE:GS) and General Electric (NYSE:GE) in a cornerstone investment that gave investors the confidence to put money back into the banking system. Quietly in the wake of President Obama's $50 billion earmark to the renewable energy industry as part of the 2009 billion stimulus bill Berkshire Hathaway is again playing the role of savior investor. This time in the crisis-stricken solar energy sector. After a Wednesday deal with California-based ...