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Our hydro lakes are basically like big batteries and we need to save them for when they are most needed, says Mike Casey. Currently it's the job of coal to help keep this big battery charged during a dry year and that's expensive and polluting. But when it doesn't rain it shines and between April-August, sunshine hours are, on average, 5% higher in a dry year compared to the average.
I woke up to a front page story in the Otago Daily Times a couple of days ago about our worryingly low hydro lake levels, and the plans being put in place by the authorities to make sure we have enough electricity to get us through the winter.
These dry years happen, on average, every 4-5 years and this one has had a significant impact on the wholesale price of electricity.
Other articles tell me that it’s also been quite calm, so we haven’t had as much wind generation as we would normally have. That doesn’t exactly help the situation, and is leading to even higher prices.
At Rewiring Aotearoa, we believe more rooftop solar is essential as we electrify all the fossil fuel machines in our economy - and not just because it reduces emissions, but because it’s the cheapest form of delivered electricity available to New Zealanders and can help bring down the price of electricity for everyone.
And it turns out it’s even more sensible in a dry year.
We looked at NIWA’s data on sunshine hours in Auckland and Christchurch since 2000.
We know that there isn’t as much sun in winter than there is in summer. But over April-August, sunshine hours are, on average, 5% higher in a dry year compared to the average.
And they are 10% higher in April/May/June, which is actually critical so that we can go into winter with higher lake levels.
Our hydro lakes are basically like big batteries and we need to save them for when they are most needed. Currently it's the job of coal to help keep this big battery charged and that's expensive and polluting.
More solar on our homes, businesses and farms - and more batteries to store that cheap solar energy and help manage our peaks - can help do that. If 1.5 million Kiwi homes got an average sized solar installation (9-10Kw), just the additional 10% kick from solar in Apr/May/June in dry years would reduce the need for one of those big Huntly coal units by 50%!
This will also generate about 23kWh per day in August, which is the equivalent of burning a 20 kilogram sack of Indonesian coal at Huntly every 1.5 days. The house with solar would stop about one metric tonne of coal from being burned in June, July and August.
We need to start thinking about customers as part of the electricity system and fairly rewarding those who have invested in solar and batteries. And we need to reward customers fairly for their contribution.
Financial commentator Frances Cook uses her own story to show that that an investment in solar and an EV significantly outperforms the stock market and fellow number cruncher Nadine Higgins says that if you do it right, EVs are cheaper to run and own; EV sales have climbed to their highest level since 2022 and are closing in on 2023's numbers and Go Rentals has just invested $2.3 million in some new Tesla Model Y Premiums; the gap between energy costs of diesel vans and utes and electric vans and utes is absolutely massive; solar is also going off right now, with one installer in Otago 448% above their sales target in March; Lightforce has gone back to the Barretts with a new TV ad; Wellington mayor Andrew Little explains its electrification strategy and Hutt City Council shares data showing how its fleet has gone from dirty Toyotas to cleaner EVs; Shenzen in China has electrified its public transport and taxis and that's come with big benefits - and some challenges; and a very simple illustration of the LNG terminal.
Read moreDownloadAs Minister of energy, climate and local government, Simon Watts had a great opportunity to push the country towards cheaper, cleaner and more reliable New Zealand-made energy. And that’s why we laid down a challenge and gave him the ‘MegaWatts’ moniker last year. Rewiring Aotearoa CEO Mike Casey says he did some good things, like enabling more solar on farms, removing tax on solar exports, fixing onerous solar consenting requirements, putting pressure on the lines companies to pull up their socks, and getting the ball rolling on the Ratepayer Assistance Scheme. "But the LNG import terminal appears to have been a defining issue."
Read moreDownloadAfter ‘crunching the numbers’ and adding in new sources of ‘New Zealand-made energy’ to our equations, CEO Mike Casey has announced that Rewiring Aotearoa will be changing its name to Refuelling Aotearoa. There has been a huge amount of independently verified research showing electrification beats fossil fuels on economics, efficiency, emissions and energy security and that there is a huge opportunity for New Zealand to electrify, but the discovery of an infinite supply of snake oil in New Zealand has changed everything, he says.
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