this post was submitted on 11 Jan 2024
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A huge battery has replaced Hawaii's last coal plant::undefined

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[–] BrianTheeBiscuiteer 69 points 1 year ago (5 children)

Wasn't very clear but the battery will be charged using existing renewable sources.

The headline is poorly worded since coal is energy production and batteries are energy storage.

[–] [email protected] 27 points 1 year ago* (last edited 1 year ago)

I assume they used to fire up the coal plant to fill gaps but now use the battery which stores excess energy generated.

Edit:

The plant’s 185 megawatts of instantaneous discharge capacity match what the old coal plant could inject into the grid, though the batteries react far more quickly, with a 250-millisecond response time. Instead of generating power, they absorb it from the grid, ideally when it’s flush with renewable generation, and deliver that cheap, clean power back in the evening hours when it’s desperately needed.

Seems pretty clear to me.

[–] [email protected] 12 points 1 year ago (1 children)

Coal is also energy storage, well, all fossil fuels. That's their primary advantage, on-demand easily accessible stores of energy.

If only they didn't simultaneously pollute and cook the earth when used...

[–] [email protected] 7 points 1 year ago

They are stored solar energy! Releasing the energy also unfortunately releases the carbon into the atmosphere.

[–] [email protected] 10 points 1 year ago

No, the plant is full of primary batteries! 4.2 million AA cells!

[–] [email protected] 10 points 1 year ago* (last edited 1 year ago)

in terms of usage though, they are quite similar. Coal serves on-demand power, whereas renewables generate power at times that don't always align with demand. Batteries can take the role of a coal plant if the renewables already generate sufficient energy, just at the wrong times.

[–] eager_eagle 6 points 1 year ago* (last edited 1 year ago)

All our "energy production" just converts energy from one state into another. Like a battery.

A dam is often referred to as a giant gravity potential energy battery.