Fort Worth-based TPG Capital plans to begin raising as much as $12 billion for a new fund, according to a report from Bloomberg. Citing two investors, the report says the total amount for TGP’s seventh buyout fund would include $2 billion the firm has already secured for a bridge fund. TPG is one of the six biggest U.S. leveraged-buyout firms. In 2006, it helped fund the buyout of TXU, now Energy Future Holdings Corp., which is now in bankruptcy. Â