Lead managers on the six-year issue launched by Greenstone Energy (Greenstone) (NR) on August 13 say that although the issuer is an unrated credit, they believe the familiar name of the company combined with pent-up retail demand will attract investors in large numbers. Greenstone is offering a minimum of NZ$100 million (US$70.1 million) in the deal with room to upsize by up to the same amount.