A British Petroleum (BP) logo is seen at a petrol station near the Burj Khalifa in DubaiLONDON (Reuters) – BP has put its U.S. wind farm operation, one of the most largest in the u . s ., up on the market, marking the continuing retreat of huge oil firms from renewable power investments whereas oil and fuel initiatives provide them higher returns. The British oil company has already sold or earmarked for sale some $38 billion worth of assets, partly to boost dollars to pay for its 2010 U.S. oil spill liabilities, but additionally to reposition itself as a smaller, leaner company with an emphasis on high-margin oil production and exploration. Reports mentioned the sale may carry an extra $1.5 billion. …