Fuel and Power Costs Are Hurting — What Kiwi Households Should Know About Green Loans

You’re probably paying more for petrol and power than you were a year ago. Not because you’re using more, just because the costs keep going up and there’s not a lot you can do about it.

So you’ve got fuel costs climbing and power bills with built-in increases that aren’t going away anytime soon. For most families something else ends up taking the hit. The savings slow down. The groceries get watched more carefully. The breathing room gets a bit tighter.

It’s the kind of thing that’s easy to just absorb and get on with. But before you do that, there’s something worth knowing about.

The upfront cost is usually what stops people

Most people know that switching to an EV or upgrading their home with solar panels, insulation, or a heat pump would reduce what they spend each month. Kiwis who’ve made the switch to an EV are often saving well over a hundred dollars a month on fuel alone. Better insulation or a modern heat pump can do the same for power bills.

But a new EV costs more than a petrol car. Solar panels aren’t cheap. Most families aren’t sitting on spare cash waiting to be spent, and taking on expensive debt to fund it doesn’t make sense. So people think about it, decide it’s out of reach, and move on. The bills keep coming.

This is where green loans come in

Most of New Zealand’s major banks – ANZ, BNZ, ASB, Westpac, and Kiwibank, offer some form of green loan. These are specifically for electric vehicles, plug-in hybrids, and energy efficient home upgrades like solar panels, insulation, heat pumps, double glazing, home batteries, and EV chargers.

At 0-1% interest or a cash contribution green loans NZ wide change the picture quite a bit. You spread the cost over time with almost no interest added on top, your savings stay where they are, and the money you stop spending on fuel and power each month goes a long way towards the repayments. A lot of people who’ve actually sat down and worked through the numbers have been genuinely surprised by how well it stacks up.

Is it right for your situation?

It won’t be right for everyone. Your fuel costs, your power bills, your mortgage, what you’ve got in savings – it all comes into it. But it’s worth actually working out rather than assuming it’s not for you.

That’s what we’re here for. At Castle Trust we help clients across Nelson-Tasman and beyond look at decisions like this alongside their whole financial picture. If a green loan makes sense for your situation we’ll tell you. If it doesn’t, we’ll tell you that too. No jargon, no runaround, just a straight conversation.

Book a free chat and let’s work through it together.

A bit of background on what’s driving costs up

For anyone who wants the detail — Stats NZ reported petrol prices rose 18.6% between February and March 2026, with diesel up 42.6% over the same period. On the power side, Consumer NZ has highlighted that lines charges are increasing as network companies upgrade ageing infrastructure nationwide. These fixed charges make up over 30% of the average power bill and apply regardless of your provider or how much energy you use.

Questions we get asked a lot about green loans in New Zealand

What can a green loan be used for in NZ?

EVs, plug-in hybrids, solar panels, home batteries, insulation, double glazing, heat pumps, and EV home chargers. Each bank has slightly different criteria so it pays to check before you apply.

Is it better to use savings rather than take out a green loan?

At 0-1% interest most people are better off borrowing and keeping their savings as a buffer. The reduction in ongoing fuel and power costs tends to cover a good chunk of the repayments anyway.

Why are power bills going up even when I use less electricity?

Lines charges. They make up over 30% of your bill and they’re rising to fund infrastructure upgrades around the country. Every household pays them regardless of how much power they use or which company they’re with.

Can a financial adviser help me work out if a green loan is right for me?

Yes. That’s exactly what we do at Castle Trust. We look at your full financial picture and give you a straight answer on whether it makes sense for your situation.