Can any solar investment survive a policy that resets every three years

The paradox at the heart of the solar boom

Solar power is having a genuine moment. Every major party has a policy, the industry body’s annual conference is being attended by all of them for the first time, and installers are turning inquiries away. You would expect the Sustainable Energy Association of New Zealand to be celebrating. It is not.

Instead, SEANZ is calling for a cross-party plan that survives electoral cycles. The irony is pointed. Developers, lenders, manufacturers and large power users are being asked to make 20 to 30 year capital commitments against rules that can be rewritten every three years. This is not a residential power bill story. It is an investment certainty story, and the current political enthusiasm is making certainty harder, not easier, to find.

The numbers are extraordinary, and so is the gap

The momentum is real. MBIE’s March 2026 Energy Quarterly shows solar generation hit a record 373 GWh in Q1 2026, up 50.2% year-on-year. Renewables supplied 94.5% of electricity generation for the quarter, the second consecutive quarter above 90%, while gas-fired generation fell 67.4% and coal 65.6%. Renewables reached a record 47% of total primary energy supply in 2025.

Yet only 4% of New Zealand homes have solar panels, against roughly 40% in Australia. Auckland, the largest city, sits below 2% and risks being overtaken by the West Coast. That gap is not about sun hours. It is a decade of policy ambiguity, grid pricing that undervalues exported power, and upfront cost. Labour’s energy spokesperson Megan Woods noted four in five households cannot access bank finance for an installation.

The recent surge has a clear trigger. SEANZ chief executive Gareth Williams told RNZ that solar in homes “really took off” from February 2026, driven by the fuel and energy crisis caused by the Iran war. Installers reported a 300% jump in inquiries after the geopolitical shock and rising gas prices.

Competing schemes, none of them the same

All three main parties have converged on a ratepayer-assisted loan architecture, but the details differ in ways that matter to anyone underwriting a project. National’s Home Energy Fund offers low-cost loans over 10 years, expected to reach 80,000 homeowners over 15 years, though Newsroom argued the terms need to be longer to reach the point where savings begin on day one. Labour has pledged $160 million over four years, including $3,000 kickstart subsidies, two loan schemes and a community battery fund. The Greens want zero-interest loans for up to 90% of homeowners.

A developer or lender pricing a 20-year project today cannot know which scheme exists in 2027, or whether any survives a change of government. The differentiation is designed for voters, not investors.

The scheme only works at a scale no one is selling

Here is the part the campaign slogans skip. Newsroom analysis found the ratepayer loan model only becomes cost-effective above $5 billion in total lending, a scale that requires extending it well beyond homeowners. The business case leans on $1.4 billion in solar impact loans to 203,000 borrowers by 2041, another $1.4 billion in rates postponement loans, and $2 billion in development contribution loans to 112,000 developers repaid over 30 years. Councils and government need put in only $35 million of equity, but without the full $5.3 billion of lending scale, setup costs make it unviable. The unspoken beneficiaries are property developers, and no party is leading with that.

The business community is saying the same thing from three directions

Strip away the solar specifics and the same argument keeps surfacing. BusinessNZ Energy Council advocacy director Catherine Beard put it plainly: “Energy infrastructure is built over decades, not three-year political terms.” She wants an enduring national energy strategy or an independent entity to depoliticise key decisions.

ERGANZ chief executive Bridget Abernethy made the investor point directly: “These investors don’t choose to invest in New Zealand because we’re nice people.” She cited a report finding infrastructure pauses and cancellations have cost New Zealand an estimated $11.8 billion over 25 years, and added that “investor confidence is built on stability, not reactive reforms and short-term thinking.” The EMA’s Alan McDonald framed it in manufacturing terms, warning that restoring confidence is “critical to preventing further deindustrialisation.”

You cannot deploy solar you have no one to install

Even with perfect policy, there is a physical ceiling. SEANZ estimates 1,500 to 1,800 installers work in New Zealand now and expects a 250% uptake increase over five years, needing roughly 2,500 more. That sits on top of a shortage of around 6,000 electricians. Williams is wary of the Australian precedent, where “every man and his dog suddenly became a solar installer and there were all sorts of issues.”

SEANZ’s call for a cross-party plan is the right instinct. All parties turning up to the conference is a positive signal, but attendance is not commitment and commitment is not legislation. The real test is whether any party will trade electoral differentiation for the durable settings investors actually need.

Sources

• Push for long-term solar energy plans that survive elections (2026-09-04)
• Labour promises subsidies, new loan schemes for installing solar (2026-07-08)
• NZ rooftop solar election pledge relies on unspoken $2b low interest loans to developers (2026-07-09)
• The real problem with National’s home solar loans policy (2026-07-07)
• Call for more solar installation training if subsidies implemented (2026-07-30)
• BusinessNZ – Stop the flip-flop: Energy sector ‘foundational’ to NZ economy (2026-08-20)
• Energy certainty key to halting deindustrialisation (2026-08-05)
• Electricity sector break-up won’t make power cheaper – Bridget Abernethy (2026-08-31)