** Shares of Mercury NZ MCY.NZ rise as much as 1.46% to
NZ$6.25
** Stock on track for a fourth consecutive session of gains
** The electricity retailer confirms NZ$220 mln ($130.20
mln) expansion of Nga Tamariki geothermal station
** Investment a part of NZ$1 bln commitment to generation
development over three years by MCY
** About 151,903 shares change hands, compared with the
30-day average volume of 583,910 shares
** Analysts' average rating is equivalent of "hold", their
median PT is NZ$6.70
** MCY stock up 10.8% YTD, as of last close
($1 = 1.6898 New Zealand dollars)
(Reporting by Manvi Pant in Bengaluru)
((Manvi.pant@thomsonreuters.com))