** Shares of electric utility NRG Energy NRG.N fall 4% to $168.50 premarket
** LS Power is seeking up to $2.1 bln from a sale of its stake in NRG, Bloomberg News reports
** The 12.3 mln shares are being offered for $163.50 to $168 each, representing a discount of as much as 6.9% to NRG's last close- Report
** Co earlier had announced 12.3 mln shares held by affiliates of LS Power were to be offloaded in a secondary offering
** 11 of 16 brokerages rate the stock "buy" or higher, five "hold"; their median PT is $203- LSEG data
** Up to last close, NRG down 10.4% YTD
(Reporting by Avinash P in Bengaluru)
((Avinash.P@thomsonreuters.com;))