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Power

Could Geothermal Power Plants Become a Source of Lithium? (fastcompany.com) 173

"Geothermal energy has long been the forgotten member of the clean energy family, overshadowed by relatively cheap solar and wind power, despite its proven potential," argues a new article in Fast Company. "But that may soon change — for an unexpected reason.

"Geothermal technologies are on the verge of unlocking vast quantities of lithium from naturally occurring hot brines beneath places like California's Salton Sea, a two-hour drive from San Diego..." As a geologist who works with geothermal brines and an energy policy scholar, we believe this technology can bolster the nation's critical minerals supply chain at a time when concerns about the supply chain's security are rising. Geothermal power plants use heat from the earth to generate a constant supply of steam to run turbines that produce electricity. The plants operate by bringing up a complex saline solution located far underground, where it absorbs heat and is enriched with minerals such as lithium, manganese, zinc, potassium, and boron. Geothermal brines are the concentrated liquid left over after heat and steam are extracted at a geothermal plant. In the Salton Sea plants, these brines contain high concentrations — about 30% — of dissolved solids.

If test projects now underway prove that battery-grade lithium can be extracted from these brines cost effectively, 11 existing geothermal plants along the Salton Sea alone could have the potential to produce enough lithium metal to provide about 10 times the current U.S. demand. Three operators at the Salton Sea geothermal field are in various stages of designing, constructing, and testing pilot plants for direct lithium extraction from the hot brines. At full production capacity, the 11 existing power plants near the Salton Sea, which currently generate about 432 megawatts of electricity, could also produce about 20,000 metric tons of lithium metal per year. At current prices, the annual market value of this metal would be more than $5 billion....

Geothermal power has the ability to complement solar and wind energy as a baseload power source — it is constant, unlike sunshine and wind — and to provide energy and mineral security. It could also offer a professional bridge for oil, gas, and coal employees to transition into the clean energy economy. The industry could benefit from policies like risk mitigation funds to lessen drilling exploration costs, grant programs to demonstrate innovations, long-term power contracts, or tax incentives.

Adding the production of critical metals like lithium, manganese, and zinc from geothermal brines could provide geothermal electrical power operators a new competitive advantage and help get geothermal onto the policy agenda.

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Could Geothermal Power Plants Become a Source of Lithium?

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  • You can't scale a geothermic installation up or down with demand. You also cannot expand an existing setup - you need a coastline or a geiser. So it's "constant" and that makes it kinda useless.

    • I recall an old study where they estimated the maximum potential yield of renewable sources of energy and geothermal and wave energy did not rank high. It may make sense on a local scale, not every region should use the same sources of energy, but overall the impact of geothermical energy will be small. Unless there is some mayor futuristic breakthrough allowing to access large volumes of heat.

    • by Alcari ( 1017246 )
      It doesn't scale, but that's not automatically a bad thing. On a large, connected grid, there will be room for non-scaling supply. You can't have too much of it, and current pricing schemes can make it very expensive not to scale down when there is excess supply, but that's mostly a result of how we've decided pricing works, not a result of the grid.
    • by jbengt ( 874751 )

      You can't scale a geothermic installation up or down with demand.

      There are ways to vary geothermal input, and consequently output, to match demand. Even if a plant is not designed to do so, base load can be met, and, if absolutely necessary, excess heat can be wasted.

    • We can use more than one source of energy.
      If your home sits in the sunlight, you can get solar, if it is shaded it may not be the best option.
      You may live near a stream that runs all year, you can build a generator on it to power your housing block, or it might freeze over every year so it isn't a good option.

      We primarily convert energy into electrical energy, with then goes into electronics which makes its output rather consistent, and can be shared. It is not like I need to buy a phone charger for areas

      • If your home sits in the sunlight, you can get solar,

        Only if you have a roof. Or, to be a little more precise, a roof which is not someone else's property. There are 4 different owners between the top of my apartment and the sky.

        So we can pick and choose what source(s) is best for our location.

        Understanding "location" to include "grid", yes. And, are you including battery storage under "chemical" in your list?

  • Close to my place we have research plant. Only 0.5MW electricity, but a hot water supply for the police stations in the town (for heating, not consumption).
    However: the lithium mined that way is enough for 20,000 EV batteries per year!

  • by FaxeTheCat ( 1394763 ) on Monday March 28, 2022 @02:14AM (#62395625)
    There is only one type of Lithium. Calling this source "battery grade" seeme like an attempt to hype the technology, and that makes me sceptical to the claims in the article.
    • by jd ( 1658 )

      https://en.wikipedia.org/wiki/... [wikipedia.org]

      I count 14 isotopes, with 2 stable and 2 with half-lives that are actually long enough to be of any importance (so 4 different types of lithium that potentially matter).

      • I count 14 isotopes, with 2 stable and 2 with half-lives that are actually long enough to be of any importance (so 4 different types of lithium that potentially matter).

        If you're building a fusion bomb, which isotope you use matters. If you're making batteries, all the isotopes you can mine are the same: they are chemically identical. For batteries, there's indeed only one type of lithium. (to quote Spock: "a difference that makes no difference is no difference.")

        • by jd ( 1658 )

          If you're using all of one isotope, your packing is going to be uniform. If you're using a mix of isotopes, your packing will have lots of holes and irregularities, which is going to impact the electrical properties. Resistance will go up, for a start.

          • If you're using all of one isotope, your packing is going to be uniform. If you're using a mix of isotopes, your packing will have lots of holes and irregularities, which is going to impact the electrical properties. Resistance will go up, for a start.

            No. Isotope shift is such a tiny effect it has no impact of crystal packing, to start, and even if it did, the resistance of the lithium itself is not an important factor in the resistance of a lithium battery.

            When you learn something about solid state chemistry, get back to me.

    • by evanh ( 627108 )

      They're talking about refinability/smeltability. How easy it is to turn into a pure metal. That needs to be cost effective too.

    • There are other uses than just batteries. Still being able to get non-battery grade lithium can free the demand of battery-grade lithium, used for non-batteries.

  • A former neighbour had a heat pump installed back in the mid-70s. Our houses were identical...well, one was the mirror image of the other. Their heating bill was always about 10% less than ours. I drive by that house a few times a year, and there's been no remodeling or anything. One of these days, I'm going to stop and ask the owner if the thing is still installed and working. If so, that would be pretty close to half a century of slightly cheaper energy...which adds up.

    • by bn-7bc ( 909819 )
      Not that i know anyrhing about this oeticukar cade, and I'm no heat pump expert at all. But i suspect if it still in use, it's probably been replaced a few times, generally they kast 10-25 years( with 15 years being recent models wit regular nainrainence)
      • ... anyrhing ... oeticukar cade... kast ... nainrainence

        I suggest you move your keyboard about 5mm to the left :)

    • by necro81 ( 917438 )

      Their heating bill was always about 10% less than ours. I drive by that house a few times a year, and there's been no remodeling or anything. One of these days, I'm going to stop and ask the owner if the thing is still installed and working.

      Not to mention that heat pump technology is substantially better than it was 50 years ago. Particularly for new construction, it is (in most climates) the cheapest way to heat and cool a house, even after amortizing the higher upfront cost.

      But a lot depends on the

    • As a heat pump is just an air conditioner with a reversing valve, and maybe slightly differently sized components so that they work better in "reverse" than they otherwise would, and an AC typically lasts 10-20 years but that means it can last a lot longer with maintenance, or just if it was spectacularly well built. And since pretty much everything is being built ever less solidly, the odds of that are better if it's older. Companies just keep skimping on materials and even fasteners to increase profit.

      Of

    • I got a heat pump in 2021, so far I have saved about 50% in my heating costs (not including the amount I am paying for the unit). I live up in the North East, they don't work well when it is below -5f, however I didn't get the one rated for the extreme cold, as my home has alternate sources of heat.

      • ... so far I have saved about 50% in my heating costs (not including the amount I am paying for the unit). .

        Out of curiosity, what did you use prior to the heat pump?

  • In Southwestern Germany, there are already some geothermal plants (in the upper Rhine plain rift).

    Some of the existing ones will be retrofitted with lithium extractors, and additional future geothermal plants are likely to have lithium extractors installed from the beginning./p>https://hardware.slashdot.org/story/22/03/28/0418236/could-geothermal-power-plants-become-a-source-of-lithium#

  • Geothermal is a bad idea for the same reason oil is: It's a finite resource, and over-use will lead to catastrophic planetary changes.

    • Geothermal is a bad idea for the same reason oil is: It's a finite resource, and over-use will lead to catastrophic planetary changes.

      Is this intended as some weird form of sarcasm?

    • Finite? It will outlast any nuclear power plants you build by hundreds of millions of years.
    • by Strauss ( 123071 )

      Technically true. but infeasibly large. A brief, conservative view [wired.com] indicates that, even at a 10% efficiency rate, we'd have ~17B *years* of power to draw down the core temp by ~900 degrees -- and doesn't account for the re-heating of the core by ongoing fissioning of heavy elements in the interim. Or that the Sun's lifetime is "only" estimated at another ~5B years; meaning that we'd have to triple the power requirements in the first estimate, move to 100% geothermal power worldwide (zero hydro, solar, win

  • This could improve the profitability of geothermal plants enough to make plants that were only marginally worthwhile be "quite worthwhile".

    So expect a lot more interest in geothermal plants.

    That said, the places that are suitable are quite limited, so there won't be a real boom.

  • Even if the US moves forward in a Manhattan Project like fashion to get domestic lithium mining going, it still won't make the technology any cheaper. A lead-acid battery of a given capacity is three to four times cheaper than a lithium battery of the same capacity and that doesn't include the battery management circuity needed to keep it healthy.

    • by Klaxton ( 609696 )

      Well maybe that wouldn't be the case if lithium was as cheap as lead. Also you can charge/discharge lithium batteries from 100% to zero and back over and over to make use of the full capacity. Not so with lead-acid.

      "The total cost of ownership, including charging costs, of the RB100 was $1,925. That’s 51% less than the Gel battery, the most economical of the three lead-acid batteries."
      https://justcatamarans.net/lit... [justcatamarans.net]

  • It looks to me like the scheme hinges on the economics of extracting the lithium from the brine, which may not be much of a stretch.

    https://finfeed.com/features/e... [finfeed.com]
    "There are a number of technology companies which market the ability to perform DLE with high lithium recovery including Lilac Solutions, Tenova Advanced Technologies, Adionics, EnergySource Minerals, and others, some of which will work well for geothermal-lithium projects."

  • GM announced its investment in California geothermal with Li extraction the middle of last year. So this is "Fast" company? e.g.: https://www.metaltechnews.com/... [metaltechnews.com]

  • Minor disturbances at Salton Sea have caused major disruptions in California's major fault several times in the past. Perhaps the most interesting thing about this (for those with a morbid curiosity) is that it begins with a minor shake near the lake and grows continuously as it spreads north and west toward Los Angeles, hitting Hollywood especially hard (oh no!). Scientists are focused on the Sea with this potential disaster in mind, and they are debating the results of disturbances such as an empty Sea, a

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