Sep 12, 2025
Electric Avenue
Electric Avenue: 12 September

Yet more stunning stats on Australia's household battery boom after the subsidy was announced; the countries doing best on wind and solar on a per capita basis; a big report on China's energy transition looks like bad news for fossil fuels; the lower North Island is set to get the Southern Hemisphere's first battery electric trains, Samoa is set to get some electric solar catamarans, and Auckland is set to get zero-emissions deliveries from Ikea; the Shameless Plug podcast brings kitchen diplomacy to the table; and a song in the key of science from Elle Cordova.

Wizards of Aus

We’ve written a fair bit about the Australian battery boom but the amazing stats just keep coming and the number of discounted batteries installed through the Government's incentive scheme recently passed the 50,000 mark, with demand around five times higher than last year. And instead of pocketing the savings from the subsidy, many homes are deciding to increase the size of their batteries. 

At this stage, the average is around 17 kWh instead of the 10-12 kWh that had been forecast. It’s expected the average size of home battery systems will quickly rise to 25 kWh, which is where the average is already sitting for the Northern Territory. 

As Energy Minister Chris Bowen says, that's a lot of toast. And a lot of other things, too.

Globally, batteries are also going off, and the number of installations increased by 54% in the first half of the year. 

The EA doesn’t collect data on battery sizes in New Zealand and only measures solar and we think that needs to change because batteries will very quickly become one of the biggest power stations in the country. It would be great to see a similar incentive scheme offered here at next year’s election because batteries are not just good for the homes that have them, they are also good for the energy system as a whole. Our poles and wires are generally built to handle the peaks. But every battery removes a home from peak and, if they’re big enough, they could remove their neighbour from peak, too. 

Medal table

Our World in Data's Hannah Ritchie is a fountain of knowledge and pumps out amazing charts on climate and energy. She decided to look at which countries are scaling solar and wind the fastest, but she didn’t just look at the overall amount, she looked at per capita stats. 

As she wrote: “It would be unreasonable to expect that a country with 10 million people is going to be building and scaling technologies at the same rate as a country with over a billion people. It would be unfair to say that smaller countries are not “'doing their share' because they never appear on a 'total generation' leaderboard."

The below chart shows the change in solar and wind generation per capita between 2021 and 2024.

Ritchie also looked at the share of solar and wind as a total of electricity production and Lithuania came out on top. 

“Lithuania topping the list was definitely a surprise to me. But solar and wind’s share of electricity generation increased from 36% to almost 66% in just three years. One thing to bear in mind is that Lithuania still relies a lot on electricity imports - they make up around 40% of its total generation.” 

And for the special data lover in your life, Ritchie’s new book Clearing the Air is availale now.  

Swapping sources

China may not be as impressive on the per capita front, but as one of the biggest economies in the world, it’s providing a very important demonstration of what’s possible and how quickly things are changing. 

Ember has just released a big report on China’s energy transition, and fossil fuel uses is plateauing and set to decline as renewables take over. 

It’s a long read, but here are the main themes: 

  1. Wind, solar and battery storage deployment in China continues its exponential rise
  2. Clean generation, headed by wind and solar, is cutting into fossil fuels’ market share
  3. Wind and solar now generate more than a quarter of electricity in seven Chinese provinces
  4. China is rapidly electrifying heating, industry and transport
  5. The advent of cheap wind and solar power is changing energy economics, for mature and emerging economies alike
  6. China’s fossil fuel consumption is poised to peak and begin falling, triggering a global decline

Ride the lightning 

Things are on track in the lower north island, because 18 new battery electric trains have been ordered and they're the first for the Southern Hemisphere.

The trains are able to switch to batteries on tracks that don’t have overhead power, technology that has been proven in countries like Japan and Germany.

As Transport Minister Chris Bishop said:

“French multinational rail transport systems manufacturer, Alstom, has been selected to deliver 18 state-of-the-art battery-electric trains, the first to operate in New Zealand. The new train fleet will significantly improve travel times and passenger experience on the Wairarapa and Manawatū lines. These new trains will replace the ageing diesel locomotive-hauled fleet which dates back to the 1970s and has frustrated commuters for years. They will deliver faster, more frequent and more reliable services for passengers travelling between Wellington, the Wairarapa and the Manawatū.

“This upgrade will enable the doubling of peak services on both lines and additional off-peak services. We expect up to 15-minute travel time savings for commuters between Wellington and Masterton, and increased speeds on the Wairarapa line.” 

Good things take time, however, so commuters, weekenders and train lovers will have to wait until 2030 before they get to take a trip.

Floating assets

Good news for Samoa, too, because innovative New Zealand boat builders McKay have just completed the first trial of a solar powered and battery propelled catamaran. 

McKay CAP-it project

The Herald reported that McKay was selected to design and manufacture five of the boats as part of an initiative called the Climate Action Pathways for Island Transport.

The catamarans would seat 12 passengers and be used for passenger and cargo transfers. The first vessel, a 10m catamaran called E-Alia, successfully completed its sea trials last month in Whangārei. The sea trials were carried out over two weeks and simulated a full day of operation that includes five round trips between Manono and Upolu, covering journeys up to about 13km. McKay reported the vessel had the ability to run continuously for seven hours while maintaining speeds of about 11km/h.

With Vessev getting its first international order, EV Maritime continuing to push the boundaries and lots of other companies in the New Zealand marine industry going electric, it seems there’s plenty of momentum on the water. 

Home comforts

Back on the road, Ikea is set to launch its first New Zealand store soon (let’s hope they start selling balcony solar here eventually as well), and it has committed to zero-emissions deliveries in Auckland’s metro area, which it says is a first for a home-furnishing retailer in New Zealand. 

It will work with Mainfreight and NZ Post to and there are plans to extend it across a wider network. 

To support the fleet, Ikea has installed fast-charging infrastructure at its Sylvia Park store and Māngere warehouse, supplied, installed and maintained by Jump Charging.

Mainfreight’s Carl George says: “Zero emission deliveries for Ikea will be managed from Mainfreight’s new, Green Star 5 rated Mainfreight 2Home facility in Ōtāhuhu, with solar and DC truck charging.”

People power

Dr Saul Griffith and Fiona Whitelaw’s new podcast The Shameless Plug is a great addition to the electrification landscape and talks to different people about their individual experience. 

The Shameless Plug Episode 2: Dr Kim Loo on kitchen diplomacy and climate solutions by Saul Griffith

Read on Substack

The most recent guest was Dr Kim Loo, a Sydney GP and climate activist, and she talked about what she calls “kitchen diplomacy”, or "running induction wok cooking classes for sceptical home cooks".

This is especially important with ethnic communities that are reluctant to change cooking methods for traditional dishes. Kim shows firsthand how electrification can be not just healthier and cleaner, but delicious. Kim even persuaded her 84-year-old mum to get rid of her gas cooktop. If you’ve ever wondered how to bring people along on the electrification journey - especially those who are hesitant - this episode will give you plenty of inspiration (and maybe even some cooking tips).

A song for the scientists

We love a good electric musical number here at Rewiring. Mike Casey enjoys singing this line at full volume as he harvests his cherries.

And this one from Elle Cordova about treasuring our scientists is a goodie, too. 

Read moreDownload the document here

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