** Shares of Mercury NZ MCY.NZ fall as much as 1.7% to NZ$6.4, hitting their biggest intraday drop since March 10
** Renewable electricity provider says it is offering up to NZ$200 million ($116.60 million) of 7-year unsecured, unsubordinated, fixed-rate green bonds
** Says issuance to refinance eligible projects in accordance with the company's Green Financing Framework
** Stock remains flat YTD
($1 = 1.7153 New Zealand dollars)
(Reporting by Aamir Sheik Khalid in Bengaluru)
((Aamir.SheikKhalid@thomsonreuters.com))