Aurora Network's Export Limit Boost: A Game Changer For Solar Owners In Otago

As solar enthusiasts here at Think Solar, we're thrilled about the recent announcement from the Aurora network: the export limit for solar systems is doubling from 5kW to 10kW. In our opinion, this isn't just a technical tweak. It's a bold step forward that empowers homeowners to maximise their solar investments while easing pressure on our local grids. For years, we've heard from customers frustrated by the cap, especially in regions like Otago where winter sun is scarce and power demands can spike. This change feels like a long-overdue win, opening doors for bigger, more efficient systems. Let's dive into why this matters, the benefits for you and the grid, and what steps you should take next.

Historically, Aurora allowed up to 10kW exports, but they reduced it to 5kW a few years back to manage the growing uptake of solar PV. The concern? Transformers can only handle so much reverse flow before voltages spike too high, risking network instability. But now, with regulators increasing voltage limits to 10% either side of 230 volts (that's up to 253 volts on the high end), the network has more wiggle room. This allows solar systems to push more power back without tripping limits.

In our view, this is smart policy evolution. It acknowledges the rapid growth of solar while adapting infrastructure to support it. Aurora stands out here: most other networks in New Zealand are still stuck at 5kW. By leading the charge, they're not only boosting customer sentiment but also positioning Otago as a solar-friendly region.

This upgrade is a breath of fresh air for anyone considering or already owning solar. Here's what stands out to us:

Larger Systems Without the Worry: Previously, the 5kW cap deterred people from installing bigger arrays. You might crunch the numbers and see that in summer, excess generation would just get throttled, leading to wasted solar potential. Now, with 10kW exports, you can size your system for year-round needs. Think covering those gloomy winter loads without compromise. We've seen customers hold back on adding panels but this change could unleash a wave of upgrades.

More Earnings from Exports: Let’s break it down with a real-world example. Say you’ve got a 10kW solar system, but you’re currently export-limited to 5kW, meaning you can only send about 5kWh per hour back to the grid. Now, with the export limit increased to 10kW, you’ve instantly doubled your export potential. If your retailer's buy-back rate is 15 cents per kWh, here’s what that looks like in dollar terms: 

At 5kW for 1 hour: That’s 75c per day, or around $22.50 a month

At 10kW for 1 hour: That jumps to $1.50 per day, or about $45 a month

Or if you have enough solar and battery capacity to export for an average of 4 hours each day at 10kW.

Old export limit at 5kW for 4 hours: $3.00 per day, or around $90 a month

New export limit at 10kW for 4 hours: $6.00 per day, about $180 a month ($2,200 a year)

That’s a straight doubling, assuming your system can generate it. No hidden fees, no complicated calculations, just more return for the power you export. Sure, this assumes sunny days and low home usage, but it clearly shows the upside of lifting your export limit.

Battery Synergy and Peak Pricing: Pair this with the new requirement for retailers to offer peak/off-peak rates, and batteries become even more appealing. Charge during cheap off-peak, discharge during high-demand peaks, and export up to 10kW. Not only do you pocket higher export rates (often premium during peaks), but you help the grid too. In our experience, systems over 12 panels (around 5kW+) will see the biggest gains here.

We at Think Solar believe this fosters smarter energy use. It's empowering. It turns passive solar owners into active grid contributors.

It's not just about individual benefits; this helps the bigger picture. Aurora covers a vast area in Otago, from Upper Clutha and Queenstown through Central Otago to Dunedin, touching three of our branches. Locally generated power stays local, reducing strain on transmission lines (like the Cromwell to Wanaka link, which has been a bottleneck).

With higher voltage tolerances, networks spend less time sending crews to tweak transformers. That's efficiency we can all appreciate. And in high-solar neighbourhoods? Exported electrons likely power your neighbours first, keeping things community-focused. Sure, we can't track every electron, but it's a nice thought. Your surplus could light up a friend's home down the street.

One caveat in our opinion: While appliances are generally tolerant of voltage fluctuations (designed for global standards), we're keeping an eye on how this rolls out to avoid any surprises.

No change is perfect, and here's where honesty comes in. Existing inverters are programmed to current grid codes, which might cause shutdowns if voltages creep toward the new 253V limit. This isn't an immediate crisis. Solar penetration in areas like Upper Clutha is only about 6.5%, so widespread issues are unlikely yet. But in solar-dense spots, it could potentially trip systems offline.

The fix? Manufacturers need to roll out updated grid codes. In the meantime, we're proactive:

Who Needs It?: Mainly systems over 5kW (think 13+ panels). If your setup is larger, we'll reach out with a plan to update. No need to contact us first, but feel free if you're eager.

This is an exciting time, but action is key. Here's our advice:

Existing Systems:

Want to Increase Your Export Limit? Your electrician or solar installer will need to update your inverter’s export settings to the new maximum (up to 10 kW) and enable the required volt/var and volt/watt voltage response settings.

Considering an Upgrade?: If you're eyeing more panels or a battery, this change supercharges the ROI. For example, a battery exporting 10kW during peaks could shave serious dollars off your bill while supporting the network.

Reassess Your Retail Plan: With doubled exports, prioritise plans with strong buy-back rates. If you leaned toward self-consumption before (knowing exports were capped), now's the moment to switch. Tools like ChatGPT can give a quick overview, but for personalised insights, chat with your local branch. We can analyse your past bills to recommend the best retailer for you.

New Installs: Jump in now. With remote capabilities, we'll ensure your system is future-proofed from day one.

In our opinion, this export boost isn't just good news. It's a catalyst for Otago's renewable future. It aligns with the region's power challenges, encouraging local generation over imports. If you're in the affected areas, let's chat about optimising your setup. Contact your local branch and we can assist. We're here to make solar work harder for you.