Why has the world started to mine coal again?
With climate change looming, it seems so completely backwards to go back to using it again. Is it coal miners pushing to keep their jobs? Fear of nuclear power? Is purely politically motivated, or are there genuinely people who believe coal is clean?
It never stopped. Hasn’t even really slowed down.
People need electricity. Renewables are great, but they don’t provide for the full generation need. Coal and natural gas power generation will continue unabated until a better (read: lower price for similar reliability) solution takes their place.
In my opinion, fossil fuel generation won’t take a real hit until the grid-scale energy storage problem is solved.
Storage. Coal, natural gas, and nuclear generate power regardless of weather, day and night.
Solar generates plenty of electricity (with enough panels installed), but it slows down significantly under cloudy skies and stops entirely at night.
Wind generates plenty as well…unless the wind stops blowing.
The grid needs power all the time, not just when it’s sunny and windy. For renewables to actually compete, the excess power they generate during sunny and windy times needs to be stored for use when it’s dark and still.
As much as we applaud lithium batteries, our energy storage technologies are abysmally inefficient. We’re nowhere near being able to store and discharge grid-scale power the way we’d need to for full adoption of renewables. The very best we can do today (and I wish I were kidding) is pump water up a hill, then use hydroelectric generators as it flows back down. Our energy storage tech is literally in the Stone Age.
Don’t underestimate the battery potential of gravity!
According to …wikipedia.org/…/Pumped-storage_hydroelectricity#…. The round-trip efficiency of pumped storage is 70-80%, that’s pretty darn good for cheap mass-storage. There’s not much more to gain there.
It works very well, not disputing that.
But, like geothermal power generation (which is also very good), it’s extremely dependent on location. Most populated areas don’t have the altitude differential (steep hills) and/or water supply to implement pumped hydro storage.
Where it can be used, it should be (and largely is - fossil fuel generation does better with some storage as well, since demand is not consistent), but it’s hardly something that can be deployed alongside solar and wind generators everywhere.
With some high voltage long-range transmission lines you could viably do it pretty much everywhere. Just requires some cooperation.
Yes it will slightly reduce efficiency over very long distances, but it’s not unreasonable amounts.
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