** Shares of utility Talen Energy TLN.O fall 2.8% to $237.98 premarket

** TLN says it is pushing outage timeline from mid-May to first week of June for its Susquehanna nuclear facility unit 2 to account for remaining tasks

** Company expects outage extension to increase expenses by about $35 million

** As of last close, shares up 21.54% YTD

(Reporting by Katha Kalia in Bengaluru)

((Katha.Kalia@thomsonreuters.com))