Meridian has been a buyer in a market where Trustpower is now more at arm's length since the spin-off of its Australian renewables business into Tilt, and has a conditional deal with Trustpower to buy its GSP Energy unit with three hydro stations in New South Wales.
Trustpower acquired what was then known as Green State Power from the NSW state government in 2014 for A$72.2m, gaining three hydro stations and an interest in two wind farms.
Demand for renewables is growing in Australia on the back of the federal government's Renewable Energy Target, which aims to encourage enough investment in renewable power stations to achieve 33 000 gigawatt hours of additional renewable electricity generation by 2020, while a 'small-scale' scheme alongside gives households the incentive to install solar panels and solar hot water systems.
Steve Symons, chief financial officer of Tilt, declined to give financial details of its agreement but said it was "considered to be of value to the business."
"It's attractive to be contracting as much of the portfolio as possible," he said. "Wind is definitely part of the mix," in terms of supply in Australia.
"The Renewable Energy Target is in place and we're operating to help achieve that and looking for further support and clarity from the government about meeting the Kyoto obligations" on greenhouse gas emissions, he said.
Trustpower spun out its wind and solar generation facilities into separately listed Tilt in October 2016 and since then has focused its strategy on the New Zealand business.
Meridian already has wind-farms in Australia and more than 100,000 customers on its Powershop branded retail business but has been dealing with an uncertain policy environment. The company flagged the power purchase agreements last year.
Meridian shares fell 0.7 per cent to $2.80 on the NZX and Tilt fell 1 per cent to $1.99. Trustpower fell 0.2 per cent to $5.39.