thegreatdivide wrote on Nov 30
th, 2024 at 12:03pm:
Frank wrote on Nov 30
th, 2024 at 11:38am:
As coal exits, the growing burden of turning wind and solar into a reliable electricity system will fall on a complex mix of batteries, hydro power and gas.
That’s a pretty shaky mix. Batteries and hydro are not energy sources, they are energy storers. If wind and solar don’t generate excess power, there will be no battery storage to call on. And grid-scale batteries are very expensive and their capacity is not deep enough to run cities for long.
All correct, except
sufficient wind and solar WILL - in the aggregate - generate excess power, in a connected two-way grid storing and producing energy with solar and/or wind always capable of producing excess renewable power.
“Solar production in the energy markets starts to come off at 3pm, at exactly the same time as people return home from work,” Minns said. “If you can not run your pool filter, not run your dishwasher, not run your washing machine, this afternoon between 3pm and 8pm, you’ll help the grid.”
In the words of Michael Caravaggio, a director of research and development at the world-leading Electric Power Research Institute: “The fact that the sun sets every night isn’t a problem if I have 5 per cent of my energy from solar. It’s a significant issue if I want to get 100 per cent of my energy from solar.”
His point is self-evident: the more heavily any system relies on weather-dependent generation, the more its significant technical limitations are magnified.
So with some dispatchable generators offline for scheduled pre-summer maintenance and breakdowns in some ageing kit, the crunch came in NSW with the setting of the sun as solar harvesters clocked off.
Recall here that the central design feature of the future electricity system is that the fuel for 82 per cent of power generation will be sunshine, wind and hydro power. Right now its share is about 38 per cent. Today the profound limitations of weather-dependent generation are disguised by coal and gas.
https://www.theaustralian.com.au/commentary/bowen-plan-threatens-to-leave-us-in-...