Meridian Energy has received consent to develop a large-scale solar farm in Morrinsville featuring 230,000 panels, incorporating a dual-use model that allows sheep to graze beneath the infrastructure. While agricultural experts note the approach is common in drier international climates, its success in New Zealand remains largely untested and subject to significant variations in pasture growth.
The Mechanics of Agrivoltaics in New Zealand
The Morrinsville project aims to maximize land productivity by maintaining sheep grazing alongside renewable energy generation. According to Massey University lecturer Sam Wilson, the model offers a potential “dual income” stream for landowners, allowing them to produce power while continuing to run livestock. While the concept is established in Australia, where panels provide necessary shade in hot, dry conditions, the results in New Zealand’s wetter climate are mixed.
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Research by Massey University’s professor of dairy production systems, Danny Donaghy, found that pasture growth directly under solar panels can decrease by as much as 84% in New Zealand conditions due to the lack of sunlight and rainfall.
Comparing Regional Pasture Performance
Data regarding the impact of solar arrays on grass growth varies significantly based on local weather systems. Sam Wilson’s study in the Manawatū region recorded a 70% decrease in growth directly under panels during wetter cycles. However, Wilson also identified that pasture located between the rows of panels can see a growth increase of up to 38% compared to open fields, as the structures may alter local microclimates.
Danny Donaghy notes that the primary challenge for New Zealand farmers is land-use economics. In high-output regions like the Waikato, where dairy and horticulture are dominant, the decision to install panels involves weighing the value of solar revenue against the loss of highly productive grazing land. He emphasizes that the “extra revenue stream” remains the primary driver for farmers considering this transition.
Consent and Community Engagement
The Morrinsville project faced regulatory scrutiny during the consent process. A spokesperson for the Matamata-Piako District Council confirmed that the application was notified to affected parties after Meridian failed to obtain initial written approval from all neighbors. Following a period of consultation, several submissions in opposition were withdrawn, and the council granted consent without a formal hearing.
Beyond the economic and agricultural data, there is potential for improved animal welfare. Observations from Australian operations suggest livestock benefit from the shelter provided by panels during extreme heat. Sam Wilson notes anecdotal evidence in New Zealand suggests that ewes and young lambs utilize the shade and shelter of the structures during colder, wetter months, potentially increasing comfort for the animals.
Project Timeline and Next Steps
The Morrinsville solar farm is currently awaiting a final investment decision from the Meridian Energy board. If the project proceeds, construction is projected to begin in 2028, with an estimated two-year timeline for completion.
Frequently Asked Questions
- Will sheep be safe grazing under solar panels? Yes, experts point to the potential for improved animal welfare, as panels offer shelter from harsh weather conditions.
- Does grass grow under solar panels? Research shows mixed results; while shade can reduce growth in wetter regions, some studies indicate that grass between rows may actually grow more efficiently.
- When will the Morrinsville solar farm be built? Construction could begin in 2028, pending a final investment decision by Meridian Energy.
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