** Shares of India's NTPC Green Energy NTPG.NS up as much as 10.8% to 117.64 rupees, their highest since January 22
** The renewable energy power generator posted a three-fold increase in fourth-quarter profit on Wednesday, driven by higher power sales and interest income
** NTPG is top gainer in Nifty mid-cap index .NIFMDCP100, which is down 0.3%
** About 29 million shares change hands, marking the most active session since April 17
** NTPG down 9.3% YTD vs 1.6% drop in mid-cap index
(Reporting by Sethuraman NR in Bengaluru)
((Sethuraman.NR@thomsonreuters.com; (+91 9945291420); Reuters Messaging: nallur.sethuraman.thomsonreuters.com@reuters.net ))