At 90%+ electric vehicle sales, what if there is power outage? What about a drought that would reduce hydro power?
The thing to remember is that you can schedule EVs to charge at certain times, say overnight when power demand is low, or during the daytime when there is a surplus of solar electricity.
If I do a back of the envelope calculation, an entirely electric vehicle fleet in China adds 2000 TWh of electricity demand.
Overall electricity demand is currently 8000 TWh.
You just have to plan on the additional electricity demand like you have to do today.
China has built out all the hydro sources now, so additional capacity has to come elsewhere eg. solar, wind, coal, nuclear etc
Also consider how China's Strategic Petroleum reserve has 685 million barrels.
At a notional cost of $100 per barrel, that's $68 Billion, which will not be required if vehicles are electric.
At current coal prices, you could buy 340 million tonnes of coal and use that as an emergency generation reserve.
With the current generation mix, my guestimate is that this would be enough for 1 full month of all electricity production in China, or 3+ months of renewables cover.
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Coal accounts for approx half of electricity generation in China (4000 TWh), and it takes many hours for a coal plant to spin up from cold. But China is planning on running coal plants at 30% load, so that they can rampup quickly for daytime demand, unexpected demand/shortfalls or longer periods with low renewable electricity generation.
Yes, running coal plants at 30% of load isn't as efficient, but it doesn't look too bad. See below
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"The net
efficiency of the conventional hard-coal-fired
power plant decreases from
45.6% at
full load to
41.5% at
40%
load"
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If you run existing (and new coal plants) in China at 30% normally, and use them as a reserve in addition to renewables, I reckon China could halve the amount of coal burned for electricity generation today. Bear in mind there is a huge amount of solar polysilicon plants coming online in China over the next 2 years, so we'll see polysilicon prices crash downwards.