NZ Solar Export Limit Just Doubled to 10kW: What the New Rule Means for Homeowners in 2026

If you've ever been told "we can't go bigger because your lines company caps you at 5kW of export," that conversation just changed. On 11 May 2026 the Electricity Authority's new rules came into force, lifting the default residential solar export limit from 5kW to 10kW across the country. It's part of a three-step shake-up of solar economics in NZ this year, and most homeowners haven't been told.

Here's what the new rules do, who benefits, and what's worth doing this week.

At a Glance

New default export limit: 10kW for residential solar, up from 5kW at most lines companies. Effective 11 May 2026.
Flexible option: Lines companies can now offer dynamic limits that flex above or below 10kW depending on network conditions — instead of a fixed conservative cap.
Stacked with two other reforms: From 1 April 2026, lines companies (distributors) must pay solar exporters for peak supply. From 1 July 2026, retailers with more than 5% of the market must offer plans that reward peak exports.
Who benefits today: Anyone sizing a new system can spec bigger panels and inverters. Existing 5kW-capped systems may be able to apply for an upgrade.
Future-proofs for V2G: The Authority explicitly named vehicle-to-grid charging as the next use case — solar + EV owners will benefit most as that rolls out.

What actually changed on 11 May 2026

For years, most NZ lines companies — Vector in Auckland, Wellington Electricity, Orion in Christchurch, Aurora down south — applied a 5kW export limit to residential solar connections by default. A handful went lower in constrained pockets of the network. That meant a homeowner with a 6.6kW or 8kW system on the roof had to throttle their inverter so it never exported more than 5kW to the street, even on a bright Boxing Day afternoon when the panels were producing well above that.

The new rule does three things at once:

Lifts the default to 10kW across every lines company in NZ. If a distributor wants to apply a lower limit on a specific connection, it now has to justify it on safety or reliability grounds — and there has to be an industry-developed assessment tool behind that justification.
Doubles the headroom for genuinely big systems. A 9.9kW system can now export at full tilt. A 12kW system on a hybrid inverter no longer has to dump 7kW of generation back into hot water or batteries just to stay legal.
Opens the door to flexible (dynamic) limits. Instead of a fixed cap, lines companies can offer connections that flex above or below 10kW depending on real-time network conditions. On a quiet weekend afternoon when the grid has spare capacity, you might export 12kW. During a constrained evening peak, the inverter dials back. The Authority's explicit framing is that this future-proofs the rules for vehicle-to-grid (V2G) charging — where an EV battery sells power back during peaks.

Several distributors flagged the change in the lead-up to 11 May. Northpower (Whangārei) and Top Energy (Northland) both publicly announced they were doubling their default residential limits. Most others will follow over the next few months as the new connection paperwork gets reissued.

Why this matters more than it sounds

A 5kW cap doesn't sound very limiting until you do the maths on a sunny North Island summer.

A north-facing 8kW system in Auckland will hit a 6–7kW output for several hours either side of solar noon between November and March. With a 5kW cap, every kilowatt above that is either curtailed (the inverter literally turns part of itself off) or diverted into self-consumption — a hot water tank, a battery, charging an EV. If you don't have a useful daytime load, the energy just disappears.

Run this through the kind of household we worked through in our solar payback period article, and the lost generation typically adds up to 400–800 kWh a year. At a 12c buy-back rate, that's $50–$100 of straight cash left on the roof. Over the 25-year life of a system, that's $1,500–$2,500 in undelivered earnings — and the panels were built to handle it. The cap was the constraint, not the equipment.

Lifting the default to 10kW takes that constraint off for almost every residential system in NZ. There aren't many homes running more than 10kW of panels through a single residential connection — the largest end of the typical bracket is 9.9kW, sized specifically to stay under the old "stay below 10kW total" inverter rules.

The two other reforms that change the picture

The 10kW export rule isn't the only thing happening to solar economics this year. It's the middle act of three.

1 April 2026: distributors must pay for peak exports

This one slipped under the radar but is arguably the bigger long-run change. From the start of April, lines companies (the network operators — Vector, Orion, Powerco etc.) became obliged to pay small-scale exporters for the help they provide at peak demand times.

Up until now, distributors only paid for capacity — the right to be connected. The energy you pushed onto the network at 7am on a cold July morning was worth exactly as much to them as the energy you pushed back at 1pm on a warm Sunday. From 1 April, that's gone. Peak-time exports earn a top-up on the standard buy-back rate, paid through your retailer.

What the rates actually look like in practice will vary by network. Some distributors are layering it as a small premium on every peak-period kWh (typically 5–7am and 5–9pm in winter); others are building in event-based payments where they signal a "high value" window and pay a bigger rate. The full picture won't be visible until retailers pass it through on bills, which is likely over the next quarter or two.

1 July 2026: large retailers must offer peak-rewarding plans

From the start of July, every electricity retailer with more than 5% of the residential market — that's the big ones: Contact, Genesis, Mercury, Meridian, plus a handful of others as they grow — has to offer at least one plan that fairly compensates customers who export power, particularly at peak demand.

This is where the rubber meets the road for ordinary homeowners. The 1 April distributor payments are wholesale. The 1 July retailer rule means they have to show up on the residential plans you can actually sign up to. Expect new "peak solar" or "smart export" plan names from the majors in late June and through July.

Putting all three together

For the first time in NZ, the structure exists for solar to be rewarded not just for quantity of export, but for timing. A battery — or eventually a V2G-enabled EV — that can hold solar through the day and discharge into the evening peak finally has a clear, paid signal pointing at it. That's the structural change that turns a battery from a "nice to have" into a financial one. We worked through the current battery payback maths in our solar batteries piece for winter 2026, and the answer was still "long" — but those numbers were run before peak-export payments are widely available. The 1 July retailer plans will move the dial. Worth re-checking once those rates are published.

How the payback maths actually shift

The biggest gains aren't on small systems — most 6.6kW arrays rarely hit a 5kW cap for long enough to lose meaningful generation. Where the rule really bites is on the 8–10kW systems that were being throttled for hours every summer afternoon.

8.8kW system, previously capped at 5kW, Auckland, 12c buy-back

Annual generation: ~6,400 kWh
Curtailment loss under old 5kW cap: ~600–900 kWh
Effective yield before 11 May: ~5,650 kWh
Total annual benefit: ~$1,170

Same 8.8kW system after 11 May 2026:

Effective yield: 6,400 kWh (no curtailment)
Total annual benefit: ~$1,310

That's an extra $140 a year you couldn't capture before, no matter what plan you were on. Over 25 years, that's $3,500 in additional return on identical hardware.

Now layer in the 1 July retailer peak-export plans, where exports during early-morning and evening peaks might pay 20–25c/kWh rather than the standard 12c. A household with even modest battery storage shifting just 3 kWh into evening peak each day picks up an additional $150–$250 a year on top. The maths for storage starts to look very different than it did three months ago.

What this means for existing solar owners

If your system was installed under the old 5kW cap, you're not automatically bumped up. The default has lifted, but your specific connection agreement still says what it says.

What you can do:

Check your current export limit on your last solar quote or your power bill. If it lists 5kW and your inverter is rated higher, you're a candidate for an uplift.
Contact your lines company (not your retailer). The export limit sits on the network side: Vector, Wellington Electricity, Orion, Powerco, Aurora, WEL, Unison, Top Energy, Northpower or Counties Power. Most have an "Increase my export limit" form or a connections enquiry contact.
Ask for a 10kW fixed limit or a flexible one. Some distributors will assess the upgrade quickly; others want a network capacity check first. The burden of justification is now on them.
If you have hybrid hardware, ask your installer to recommission. Lifting the inverter's export setting is usually a 30-minute software change, sometimes done remotely — often free for existing customers.

What it means if you're shopping for solar right now

Three practical changes to how you should be specifying a quote in May 2026:

1. Ask installers what export limit they're applying for, not the default they remember. Many quotes circulating right now still reflect old 5kW assumptions. A good installer will already be aware of the new rule and pushing for 10kW (or flexible) connections as standard. If a quote you're sitting on assumes 5kW, ask for it to be redone.

2. Spec the inverter for headroom, not minimum. Under the old rules, there was no point putting in a 10kW inverter on a 6.6kW panel array — you couldn't export above 5kW anyway. Now there is, especially if you might add panels or batteries later. A 10kW hybrid inverter costs around $1,000–$1,500 more than a 5kW string inverter and is the right call for almost any new install.

3. Ask which lines company you're on and what their flex offer is. Distributors are rolling out their version of the flex limit at different speeds. Top Energy and Northpower have moved early. Vector and Wellington Electricity are in the process. Orion has signalled they'll offer flex from later in 2026. If you're connecting in a flex-ready area, you can sometimes negotiate a higher peak limit than the 10kW default.

For the full picture on system sizing, panel brands, and choosing an installer, see our complete solar panels guide. Run your own numbers in our savings calculator — but be aware the new export limit and the 1 July retailer plans aren't yet reflected in most online calculators, so any payback figure you see is likely a touch conservative.

The V2G angle (and why the Authority pointed at it)

The press release announcing the rule change went out of its way to mention vehicle-to-grid charging. That's a tell.

V2G turns the battery in your EV — typically 60–80 kWh, far bigger than a residential home battery — into a controllable export source. With a 10kW flexible limit and a 1 July retailer plan that rewards peak exports, the maths for an EV owner home in the evening starts to look genuinely interesting: discharge 8–10 kWh from the car between 5pm and 8pm at 22c and you've earned around $2 in a few hours, for energy you bought overnight on an EV plan for maybe 12c.

It's not here at scale yet. Most NZ EVs on the road today aren't V2G-enabled, and bidirectional charger hardware still runs $6,000–$9,000 installed. But the Authority has now structurally laid the rails. Within 2–3 years, expect this to become real — and a genuine reason to think about how your solar, EV charger and retailer plan fit together. Our home EV charger installation breakdown covers what's already changed for EV owners in 2026.

The honest takeaway

The 11 May 2026 export-limit change is genuinely good news for NZ solar — but it's not a game-changer on its own. It's one of three reforms hitting between April and July, and the three together are what reshape the picture.

For existing solar owners, the action is simple: check whether you're capped at 5kW, and if so, ring your lines company to ask for an uplift. Most should do it without much fuss.

For prospective buyers, the smart move is to spec the system as if the new rules apply (because they now do): bigger inverter, hybrid-ready, no artificial 5kW ceiling, and pay attention to which retailer plan you sign up to once the 1 July peak-export plans land.

For everyone else watching from the sidelines: the structural argument for solar in NZ just got incrementally stronger, and the structural argument for battery storage got considerably stronger. The crossover point where most NZ households should add storage isn't here yet, but it's closer than it was at the start of the year.

What to do next

Find out your current export limit. Check your solar quote, your last bill, or call your lines company. Anyone capped at 5kW is a candidate for an uplift.
If you're shopping, get quotes that reflect the new rule. Three quotes, same panel array, same inverter spec, all assuming a 10kW or flex export connection. Find verified solar installers in your area.
Re-check your retailer's buy-back rate. The new peak-export plans will start landing from 1 July 2026. If you're locked into a 12-month contract that doesn't allow for it, plan now.
Wait on a standalone battery purchase if you're on the fence. The 1 July retailer plans will materially change the maths. We'll update our battery analysis once those rates are public, but waiting four to six weeks for clarity makes sense.
Talk to your installer about hybrid inverter options. Even if you're not buying a battery now, a hybrid inverter installed up front is dramatically cheaper than retrofitting one later — and it's the piece of hardware that lets you take advantage of every reform happening this year.

The rules just got better. The maths just got better. The next step is making sure the system on your roof — or the one you're about to put on it — is set up to take advantage.