** Shares of electricity generator Mercury NZ MEL.NZ slip
as much as 3.7% to NZ$6.445, their biggest intraday pct loss
since March 7
** Co considers making an offer of up to NZ$300 mln ($184.08
mln) of unsecured subordinated capital bonds to institutional
investors and New Zealand retail investors
** Shares hit their lowest level since May 30
** Stock up 1.4% this year, as of last close, vs a 1.8%
increase in the benchmark S&P/ASX 200 index .AXJO
($1 = 1.6297 New Zealand dollars)
(Reporting by Roushni Nair in Bengaluru)
((Roushni.Nair@thomsonreuters.com;))