According to a report in the Australian Financial Review, the trans-Tasman bid beat out other parties including ASX-listed APA Group, Canadian pension fund CDPQ and Australian fund manager Infrastructure Capital Group.
"This compelling acquisition proposal is a result of Tilt Renewables' constant focus on delivering long‐term value for shareholders and the board is pleased that, with these new owners, the transition to renewables in Australia and New Zealand will continue to
accelerate," Tilt's chairman Bruce Harker said.
Just prior to the announcement, Tilt shares had been trading for less than $4.
Mercury is already Tilt's second largest shareholder, at just under 20 per cent.
Both Infratil and Mercury have agreed to vote in favour of the scheme.
The deal values Tilt's New Zealand business at $770m, however the value of Mercury's existing shareholding is around $585m, meaning the company will increase debt by around $185m.
Mercury's shareholding in Tilt was acquired three years ago for around $144m.
Shares in Tilt closed at $6.48 on Friday, having climbed as high as $6.90 in early February.