Solar energy is often hailed as the cornerstone of a low-carbon future but its construction-waste footprint is rarely discussed. In New Zealand, each utility-scale solar farm may generate hundreds of tonnes of waste – from broken panels and timber pallets to cabling and excess packaging – before it even begins producing electricity.

International experience highlights both the scale of the problem and possible solutions. By 2050, global solar waste could reach between 60 and 78 million tonnes. Australia is projecting 100,000 tonnes annually by 2030, while the EU already mandates manufacturer take-back of panels under strict waste regulations. Meanwhile, innovators such as PV Circonomy (US) and Lotus Recycling (Australia) are proving that near-100% recycling is possible.

For New Zealand, the message is clear. By embedding circular economy practices from the start, the country can leapfrog global peers – delivering not just clean energy, but truly sustainable infrastructure.

Rethinking solar construction waste

In New Zealand, projections indicate that waste generation from solar photovoltaic (PV) panels is expected to remain relatively low until the early 2050s, since most panels installed in the 2020s and 2030s will still be within their service lives. However, after mid-century, large-scale decommissioning will begin, with waste volumes projected to rise steeply, reaching about 2.2 million tonnes in the 2076–2080 period alone. Between 2052 and 2080, cumulative PV waste could total approximately nine million tonnes if current growth trajectories for capacity are maintained, revealing an impending surge in utility-scale solar waste facing New Zealand.

Unless addressed with some urgency, this hidden by-product threatens to dull the green credentials of solar power.

What’s in the waste stream?

Construction waste from solar projects includes familiar materials such as concrete, timber, metals and cardboard. But solar-specific components add complexity.

A crystalline silicon (c-Si) solar panel typically contains about 76% glass, 10% polymer, 8% aluminium, 5% silicon, 1% copper and less than 0.1% silver. While technically recyclable, in practice only 20–25% of material (mainly aluminium and glass) is commonly recovered today.

The rise of solar in New Zealand mirrors a global surge. As of 2025, about eight utility-scale solar farms were operating in New Zealand, with more than 50 additional projects in the development pipeline. Meanwhile, grid-connected solar capacity has reached approximately 247 MW, reflecting a rapidly expanding renewable energy sector. However, construction brings various complications.

• Fragile cargo: up to 5% of solar panels can be damaged during transportation.
• Packaging mountains: crates, strapping and polystyrene dominate site waste.
• Remote locations: transporting debris to recycling centres is costly and emissions heavy.
• Limited infrastructure: New Zealand lacks a dedicated solar recycling facility, unlike Europe or Australia.
• Policy gaps: recycling mandates remain inconsistent, leaving businesses without clear obligations.

In short, the very projects meant to power a low-carbon future risk generating a parallel waste crisis.

A fork in the road: landfill or circularity?

Precise costs vary by site, logistics and material values, but developers report that landfilling solar construction waste can cost several thousand dollars per megawatt. Recycling and reuse practices can reduce this significantly.

In some cases, industry practitioners suggest savings of about NZ$1000 per megawatt are possible when waste is properly segregated, metals are recycled and packaging is reused or mulched onsite. For a 150-megawatt project, this could equate to avoided costs in the six-figure range.

The policy imperative

Unlike the EU which enforces strict take-back obligations on manufacturers, New Zealand relies on voluntary schemes and patchwork recycling options. Without supportive policies such as financial incentives or mandatory take-back schemes, recycling PV panels remains economically uncompetitive, with costs estimated at several times higher than landfilling. Consequently, landfill disposal continues to represent the path of least resistance.

New Zealand will benefit significantly from implementing future-focused sustainability policies such as:

• Supporting investment in dedicated solar recycling plants
• Providing financial incentives for recycling and reuse
• Enforcing consistent standards nationwide, avoiding loopholes.

Such measures could position New Zealand not as a latecomer, but as a leader embedding circularity from the outset.

The future of solar waste management rests on three pillars:

• Prevention: smart procurement and packaging reduce waste at the source.
• Partnerships: collaboration across suppliers, recyclers, iwi and communities maximises reuse.
• Policy: strong regulation and incentives create scale and trust.

If it embraces these pillars, New Zealand could deliver not only clean power but also a new standard in landfill-free solar construction.

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This is an edited extract from ‘Closing the Loop: Managing Solar Construction Waste in New Zealand’. Read the full article here.