Myth: Just a small area of solar panels plus storage can power the world.

Truth: Storing just 3 days of global energy would cost $590 trillion at @elonmusk’s current prices. And the panels would take up more space than all the world’s cities, towns, and villages combined.

We often hear just a small area of solar panels plus storage batteries can power the world.

"Such an obvious move" says @elonmusk about this idea, adding "Even solar plus batteries on a small section of Spain would solve EU energy needs."

This is dangerously false.
Musk says that "to power the whole Earth" we need just solar panels and "some batteries."

What is "some batteries"?

To store a mere 3 days of world energy, to be prepared for weeks (let alone seasons) with lower-than-usual sunlight, takes >1335 terawatt-hours in batteries.
The world uses over 165k TWh of energy annually, or ~1.36 billion MWh in 3 days. 1000 Tesla Megapacks (3916 MWh of storage) have a price over >$1.7 billion. This would mean 3 days of storage using Tesla batteries would cost >$590 trillion. That's 6X world GDP!
For those who think $590 trillion in batteries will somehow soon become cheap due to economies of scale, consider this: Tesla Megapack prices have been increasing, not rapidly decreasing, lately.

And efforts to scale batteries on an artificial timetable drive up prices.
The focus by @elonmusk and others on the *space* taken up by solar panels and batteries dodges the real issue: cost-effectiveness.

Due to stratospheric battery storage costs, no amount of solar panels can *cost-effectively power* the world.
Arguing that solar panels + batteries can provide energy to 8B people using modest space is like arguing that Rolls-Royces can transport 8B people using modest space.

Yes, there’s *space* for 8B Rolls-Royces—but the human *time* it would take to produce them is cost-prohibitive.
Another reason the world can’t be powered by solar panels and batteries: these only provide electricity—currently 1/5 of the world’s energy. Electricity can’t power many uses of energy (flight, cargo ships) and is very costly for others (many forms of industrial process heat).
The main lie of "Just a small area of solar panels can power the world": it ignores the insane cost of the necessary batteries.

But it also drastically underestimates how much space solar panels require.

For example, this viral Twitter post underestimates the area by some 25X.
The world uses >165,000 TWh of energy per year, which requires ~19 billion kW of power output on avg. An optimistic, real-world power density for solar projects is 10 W/m^2. To power the world, you’d need ~1.8 million km^2 of solar PV projects—about the size of Libya.
If 1.8 million sq km of solar panels doesn’t seem like much, note that it is *more than all cities, towns, villages, and human infrastructure combined* (~1.5 million sq km).

And this excludes the huge footprints of solar/battery mining, manufacturing, and transmission.
Summary: While we are told that the world can be powered by a small area of solar panels + batteries, the storage costs involved are impossibly high (hundreds of $trillions) and the panels involved would take up more area than all the world’s cities, towns, and villages combined.
The idea that the world can be powered by a small area of solar panels and batteries has been a major cause of today’s global energy crisis.

The world artificially restricted fossil fuel supply because smart people like @elonmusk told us we could use solar + batteries instead.
Elon Musk has dramatically improved his energy rhetoric over the last year, acknowledging the need for oil and gas and walking back his past climate catastrophism. But he and others need to stop spreading the deadly idea that solar+batteries can power the world.
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I hate that all discussions of @elonmusk are so easily polarized into megafans and megahaters. I like him in many ways, but I must challenge any bad energy math that gets a lot of circulation.

Another example:

@elonmusk More math.

This myth promoted by Elon and @LeoDiCaprio did a huge amount of damage, making countless people think that with just 100 Gigafactories we could replace fossil fuels. So far from true.

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An interesting thread... @elonmusk any comments? (a good faith inquiry).