Sep 27, 2024
Rewiring Aotearoa
Electric Avenue: Sept 27

In this week's e-party, gas in homes is dumb and electric homes are not, a simple solution for those who need to charge their EVs on the street, the wooden winds of change are blowing, and more electric tractor news (this time from the 1920s).

Home fires not burning

Despite the boastful gas lobby continuing to assure New Zealanders that gas will be available for their homes, Rewiring Aotearoa’s official position on the matter is that putting gas in your house is really dumb - mostly because it’s more expensive than the electric options that are now available and is likely to get more expensive as the gas fields diminish. It's also dumb because it’s bad for your body if you’re burning it indoors and it’s a major (and unnecessary) source of carbon emissions. 

So-called ‘renewable’ gas is even more expensive than fossil gas and there simply won't be enough of it to be useful. 

Not surprisingly, given the economics, it’s becoming increasingly common to see developments turning away from gas and going all-electric. In New York, an all-electric skyscraper opened this year, and a  new passive house development in New York State is fossil-fuel free. 

The state of Victoria has banned new gas connections, but as the economics swing in favour of electric options - and the more knowledge homeowners have about the higher running costs of fossil fuel homes - bans may not be needed because (and this deserves repeating) gas in homes is dumb.  

Kevler Development is one company that has seen the light. It has made solar panels standard on its 266 home Harrow Green development in Rolleston, and there’s no gas connections in sight. 

The homes have electric appliances and a relay in the switchboard to prioritise solar to heat the water cylinder, then the heating system when the hot water has reached temperature. They are also prewired for smart EV charging and if the homeowner has an EV it will provide and install the charger for free, as well as give them 30,000 RUCs. 

Electric homes appear to be more appealing homes and another development of 340 lots will be following this template. The company has also invested in 50 panels to run the compound. 

On a smaller scale, a new development in Auckland called Tūī Glen is promising zero energy bills and other sustainable features. And Octopus Energy is aiming to create 100,000 zero energy bill homes in the UK by 2030

Some homes with large solar arrays, like Jonathan Holmes’ passive house in Hawea, are getting paid handsomely by their retailers for their contribution to the grid and we’re advocating strongly for customers to be paid fairly so they can make even more. We have ticket scalping laws for big events, but we don’t do anything about energy scalping. So let's end energy scalping!

Building well from the start is important to reduce bills and emissions (and it appears there will be a buildings and construction chapter in the second Emissions Reduction Plan), but we won’t reach our emissions targets if we’re just focusing on new homes, simply because we don’t build enough of them. 

Swapping out the fossil fuel machines and adding rooftop solar and batteries to our existing homes - and offering incentives or long-term finance to do it - is also what we need to be focusing on. 

Take it to the streets

The vast majority of New Zealand homes have access to off-street parking, which means they can plug in their EV to a dedicated smart charger or create a more ‘organic’ slow-charging set up with cords hanging out windows, snaking under garage doors or going through cat flaps. 

But as our cities change and intensification increases, off street parking becomes more of a luxury and cars may need to remain on the street. Fast charging is an option, but it’s the most expensive way to charge your EV, and some places have chargers on lampposts or bollards. 

But the Kerbo Charge - which can run an EV charging cable from your house to your car via a channel in the footpath - offers a simpler solution. 

The company installed its first channels in 2023 and now has 25 trials running with councils in the UK.  

It's not just good for homes. One of the best things about this idea is that businesses could put chargers out front.

Power tools

We mentioned Lincoln University’s new electric tractor in last week’s edition. It’s a beautiful Dutch machine and it’s nice for Forest Lodge’s Monarch electric tractor to finally have some company. 

But, while doing some rural research, one of our team discovered what could be the world’s first electric tractor. 

Electric tractor
www.TeAra.govt.nz/en/photograph/18408/electric-tractor

“An electric tractor works alongside a horse team in Canterbury in the 1930s. The electric tractor was developed in Ashburton to increase local demand for electricity. Although the machine looked cumbersome, with its pivoted turret through which the feeder cable was passed from a transformer on a nearby truck, it worked quite well. The eight machines built managed over 8,000 hours work between them. However, tractors driven by oil fuels proved cheaper to run.”

That was then, but this, as the Electric Farms report shows, is now: “The agriculture sector spends around $700 million on diesel each year. Shifting away from diesel machines is a huge economic opportunity for farms because electric machines are so much cheaper to run. When powered by solar and batteries, farms can dramatically reduce their energy bills and improve their resilience.”

Lots of big electric machines have big batteries, but don’t discount the cord. As the country’s biggest electric shovel at Macraes mine in Otago shows, sometimes it pays to be plugged in. 

Tall timber

Renewables require materials to build, but it’s a tiny sliver compared to the materials we extract to run our world on fossil fuels and most of what gets built is recyclable (our latest ‘Watt Now?’ runs through the reasons electrification is a much better option when it comes to reducing waste). 

Still, there is always room for improvement and  Swedish company Modvion is making massive wind turbines made out of wood. 

By using lighter engineered wood, the company says it ”can build a tree that’s 150 or even 200 metres high and increase the efficiency of the turbines” while also reducing emissions.

And if that’s a bit big for the backyard, small wind turbines could be an option. 

Let’s hope Modvion’s next innovation is a combined ‘global cooling fan’ and electricity-generating turbine. 

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