** Talen Energy's TLN.O shares rise ~15% to $304 in extended trading
** Talen to acquire Caithness Energy's Moxie Freedom Energy Center in Pennsylvania and Caithness and BlackRock's Guernsey Power Station in Ohio for $3.5 bln
** All the 12 brokerages covering the stock rated it at "buy" or higher; their median PT is $306
** Including session moves, stock up 31% YTD