Mercury NZ Limited (ASX:MCY): Wind Projects and Renewable Investment in 2026

Aditi Sarkar

10 November 2026 09:52 PM AEDT

Mercury NZ Limited (ASX:MCY): Wind Projects and Renewable Investment in 2026

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Highlights

Mercury opened the NZD 486 million Kaiwera Downs Stage 2 wind expansion in September 2026.
The September-quarter update confirmed full generation at Kaiwera Downs Stage 2.
October 2026 brought a notice to proceed for the NZD 506 million Puke Kapo Hau project.
Mercury reported all 12 turbines installed at Kaiwaikawe Wind Farm by September 2026.

Mercury NZ Limited (ASX:MCY) generates and retails electricity in New Zealand, with hydro, geothermal and wind generation Assets alongside customer energy services. Mercury NZ Limited (ASX:MCY) shares closed at AUD 5.32 on 10 November 2026. Its 2026 operating updates document completed generation additions and further renewable development commitments.

Renewable Generation and FY26 Reporting

Mercury's FY26 reporting covered the financial year ended 30 June 2026. The company described stronger performance supported by higher hydro generation, additional renewable generation and cost management, alongside Investment in new capacity. Mercury (ASX:MCY) operates across generation and retail, so its results reflect both electricity production and customer-facing services.

The company also reported commissioning activity at the Ngā Tamariki geothermal station during 2026. Its March 2026 operating update recorded the opening of the OEC5 geothermal unit. Hydro output, wholesale electricity prices and geothermal availability can affect generation earnings, while customer Demand and retail margins influence the wider business. No numerical Earnings estimate is necessary to assess the documented project milestones.

Kaiwera Downs and Kaiwaikawe Progress

In September 2026, Mercury opened Stage 2 of the Kaiwera Downs Wind Farm expansion in Southland, describing the project as a NZD 486 million development. Its operating update for the quarter ended 30 September confirmed that Kaiwera Downs Stage 2 had reached full generation. This is a completed operational milestone rather than a future construction target.

Mercury (ASX:MCY) also reported that all 12 turbines had been installed at Kaiwaikawe Wind Farm by the September-quarter update. Installation is not identical to full commercial operation; testing and commissioning are separate steps. Earlier FY26 reporting had identified Kaiwaikawe as progressing on schedule, with full operation expected in the first half of FY27. Investors following 2026 delivery therefore have two distinct measures to monitor: installed capacity and generation formally entering service.

Puke Kapo Hau Investment Commitment

On 15 October 2026, Mercury issued a notice to proceed for the NZD 506 million Puke Kapo Hau Wind Farm development west of Dunedin. The planned 192 MW project comprises 40 turbines and is intended to extend the existing Mahinerangi wind development. Mercury (ASX:MCY) described the combined site as set to become New Zealand's largest wind farm when complete. That statement refers to the planned combined development, not completed capacity in October.

Mercury had earlier obtained fast-track approval for the project in July 2026. The October notice represents a further delivery decision, but does not mean the turbines were already installed or generating. Construction spending, contractor execution and the timing of first generation remain relevant to monitoring the project.

Capital Commitments and Operating Risks

Mercury (ASX:MCY) announced a hydro refurbishment contract in April 2026 as part of a NZD 590 million upgrade program covering three Waikato River hydro stations. In May, it committed NZD 75 million to geothermal appraisal drilling at two existing sites near Taupō. Appraisal work is intended to inform future investment and should not be treated as completed new generation.

Its September-quarter operating update indicated FY27 stay-in-business Capital expenditure of approximately NZD 150 million. Mercury (ASX:MCY) faces exposure to hydrology, wholesale electricity prices, construction costs and project commissioning schedules. The distinction between operational generation, installed turbines and projects approved for development remains central to assessing progress through FY27.

Key Insights

Mercury’s 2026 developments include full generation at Kaiwera Downs Stage 2, turbine installation at Kaiwaikawe and an October go-ahead for Puke Kapo Hau. These milestones represent different stages of renewable investment and operational delivery.

FAQs

Q: How large is Puke Kapo Hau planned to be?

A:192 MW with 40 turbines.

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