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California Will Stop Using Coal as a Power Source Next Month (latimes.com) 132

An anonymous reader shared this excerpt from a Los Angeles Times newsletter: One of the most consequential moments in California's drive to beat back climate change will take place next month. The state will stop receiving electricity from the Intermountain Power Plant in Central Utah, meaning our reliance on coal as a source of power will essentially be over...

[T]he U.S. got nearly half its electricity from coal-fired plants as recently as 2007. By 2023, that figure had dropped to just 16.2%. California drove an even more dramatic shift, getting just 2.2% of its electricity from coal in 2024 — nearly all of it from the Intermountain plant. Operators plan to cut off that final burst of ions next month.

"And with improved technology to store power, the change has been made without the power shortages that dogged the state up until 2020..."
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California Will Stop Using Coal as a Power Source Next Month

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  • "Burst of ions?" (Score:4, Informative)

    by ClickOnThis ( 137803 ) on Monday October 13, 2025 @12:46AM (#65720820) Journal

    No, it's the electrons that move in the metal wire of the power-distribution lines. And not very much: in AC distribution, they just wiggle back and forth a fraction of a millimeter.

    • If we're going to play pedantic polly: The combustion of coal produces small amounts of plasma (which is ions). In a few coal power plants, plasma torches are used for ignition and control of the combustion.

      • Fair point. However, it's the heat from the combustion that is used to create the electricity, by boiling water to turn a turbine with the resulting steam.

        But please, keep looking for ions in the delivery chain. This is kinda fun.

        • But please, keep looking for ions in the delivery chain. This is kinda fun.

          Ions are central to delivering electricity. Most High Voltage lines are aluminum conductor steel-reinforced (ACSR) cables where the steel provides most of the strength and the aluminum is the conductor. The electricity flows by inducing the electrons to move back and forth creating valance shells with an electron missing that another electron wants to fill. Each time an electron leaves the valance shell of the aluminum atom, it becomes an aluminum ion. The aluminum ions don't move, but they are tangenti

          • Actually... it's the outer layer of each of those strands that carries the current... so it'd be the outer-most layer's skin that carries... all the rest is just a capacitance sink... the "skin effect" (that's why a pair of solid-core wires for a speaker has more oomf than a pair of stranded wires)

            • by tragedy ( 27079 )

              Note that "skin effect" only applies to AC current, DC tends to flow more evenly through the cross section of the conductor. Of course, there is also a thermal effect that will increase resistance towards the core of very large conductors leading to more flow on the outside than the inside, but it's not as pronounced. Just bringing it up because I have been dinged on not being specific enough about this difference before and also because there are actually HVDC lines going from the Intermountain Power Plant

        • They said "Operators plan to cut off that final burst of ions next month" .. that could be the ions created in the coal combustion. Claims about ions in the delivery chain are something you hallucinated.

          • When I think of burning coal, "burst of ions" is not the first thing that comes to mind. Especially when it's burned to create electricity with the heat (not ions) produced in the combustion.

            IMHO the phrase was written by someone reporting poorly on a story about electricity generation, thinking that "ions" are conveying the energy.

    • by hey! ( 33014 )

      One of the casualties of the Internet has been newspaper science desks. In the post Sputnik era, major city newspapers built teams of reporters with science and technology backgrounds to cover breaking science stories. To make use of that manpower in between big stories, they'd do a weekly science supplement, which was one of my favorite parts to read. These bureaus even had people on staff who could cover breaking news in *mathematics*.

      That's all gone now, and you can see the impact of that in the scie

    • by tragedy ( 27079 )

      Ions originally referred to charged particles, either positive or negative. So, a positively charged particle (cation) would be one with m ore protons than electrons and a negatively charged particle (anion) would have less protons than electrons (we are sticking to regular matter, of course and ignoring antimatter, or anything else exotic). Of course, that simple definition would actually make an electron an anion, in the same way that a single, naked proton would be a cation. It is actually a simple defin

  • by Mozai ( 3547 ) on Monday October 13, 2025 @01:17AM (#65720860) Homepage

    From the article: The Golden State is looking to newer, cleaner technologies, including hydrogen, which the new Utah plant will be able to create by splitting water molecules into hydrogen and oxygen atoms. The technology creates byproducts that concern some environmentalists.

    Surely you're going to spend more money cracking water to get the hydrogen molecules than you'll get burning the hydrogen gas later. And what cthulhu-inspired process are they using that "environmentalists" are clutching their pearls about H2 and O2 gasses?
     

    • Good points. I was wondering the same thing. Then again, I wasn't all that impressed with TFA's take on the science. (See my comment above about "Burst of ions.")

      Electrolysis with renewable energy should have a very low environmental impact. There is the sunk cost from constructing the plant and the electrolysis equipment. If non-renewable energy sources are used, then the environmental cost goes up.

      But I think the "environmentalists" mentioned in TFA might be concerned about other methods that do have an e

    • by Anaerin ( 905998 ) on Monday October 13, 2025 @01:50AM (#65720878)

      That's easy, they're using methane-based steam reforming [wikipedia.org], which requires large amounts of heat (the reaction is endothermic) and produces huge amounts of both CO2 and CO

      If they're only using air for the steam reformation supply: CH4 + H2O => CO + (3)H2 along with potentially CO + H2O => CO2 + H2 if they balance the feed rate perfectly.

      If they're using pure Oxygen instead, they also get to add: CH4 + 0.5O2 => CO + (2)H2

      This also requires the fuel source they're using be purified to remove sulphur and other contaminants which will interfere with the reaction, and need to be disposed of separately. And it's 50-75% efficient at converting at best.

      Damnit, I used sub tags, but no, Slashdot says no....

    • by Khyber ( 864651 )

      Solar power is free. Hydrogen makes for fairly decent storage once you solve the 'bleeds through most anything' part.

      • Many 'hydrogen' plants use the Nitrogen in the air plus water to make Ammonia Plus Oxygen. Room temperature Ammonia contains more hydrogen per liter than liquid hydrogen - and you do not have to make it cold.

        You then ship the Ammonia where you want it, and use other processes to get the Hydrogen back, which often releases carbon monoxide or carbon dioxide.

        Basically, pure hydrogen is a very bad battery. Lots of people think a lithium ion is a better way to store electricity.

      • The "bleeds through most anything" part for storage is easily solved.
        Unfortunately the solution is anhydrous ammonia, which presents its own colossal safety risks.

    • by evanh ( 627108 )

      It's for short term storage. Consider hydrogen as a big battery. Perfect for flattening out the ups and downs of solar and wind.

      One of its risks is volatility. It can go bang really well when mismanaged.

      • Storing power as hydrogen? Do you mean Nickel-Hydrogen batteries?
        Or, do you mean hydrogen as a potential fuel?
        That would only work if that big generator is kept spun up... might take a few minutes to get to 100% from a dead stop.

        No single one renewable is going to be the Golden Ticket... not even just two... it'll take a multitude of them to keep the precious datacenter running so the AI-LLM can keep generating slop.

    • by q_e_t ( 5104099 )

      Surely you're going to spend more money cracking water to get the hydrogen molecules than you'll get burning the hydrogen gas later.

      I'm not aware of burning hydrogen producing money as opposed to energy.

    • In theory you use excess Wind / Solar to make the hydrogen. In reality its green washing of processing "Natural Gas" methane into Hydrogen to keep selling carbon waste to the atmosphere.
    • Surely you're going to spend more money cracking water to get the hydrogen molecules than you'll get burning the hydrogen gas later.

      Most likely the process will use solar power for electrolysis of water into hydrogen gas. From the standpoint of timing, excess solar power would be used to create hydrogen gas which could be store and used at night or other times when solar cannot be used.

      And what cthulhu-inspired process are they using that "environmentalists" are clutching their pearls about H2 and O2 gasses?

      Environmentalists are rightfully concerned that the most common source of large scale hydrogen gas creation is processing natural gas, coal, and oil. Such processes release CO2 as the main byproducts.

      • Most likely the process will use solar power for electrolysis of water into hydrogen gas. From the standpoint of timing, excess solar power would be used to create hydrogen gas which could be store and used at night or other times when solar cannot be used.

        I'm sorry, are you saying to deploy solar panels to power water/electrolysis to generate electricity from water so you can have electricity when the sun is down?

        Why not simply store the excess solar energy?

        • I'm sorry, are you saying to deploy solar panels to power water/electrolysis to generate electricity from water so you can have electricity when the sun is down?

          I am saying using burning hydrogen is one method that can used when solar is not available.

          Why not simply store the excess solar energy?

          There are alternatives like battery banks, molten salt, compressed air. All of these will depend on what is available in the location. Using a closed loop hydrogen/water loop is a possbility.

        • You are, assuming, there _is_ excess energy from solar (which only happens during the day)... and we have huge racks of batteries nearby to store the "excess" (instead of the LLM-AI datacenters gobbling it all up) (for use at night or when it's cloudy or the panels are covered with snow or dust, or some of them fail)... and hopefully nothing goes wrong in the battery facility (like when the battery room in The Abyss got a little wet and they all shorted and caused an explosion).

          • You are, assuming, there _is_ excess energy from solar (which only happens during the day)... and we have huge racks of batteries nearby to store the "excess"

            Using excess solar for electrolysis of water is one possibility of energy storage. While batteries are an option too, the disposal of battery technologies like lithium-ion, lead acid, and nickel-cadmium present their own problems. Sodium-ion seems to be a better possibility in the future as well but they have only recently been available..

            • Yes, but... assume one square meter of solar panel cranks out 1kilowatt... the precious datacenter needs 10GW... we'd need at least 10 million panels... double that to charge the massive battery bank so it can run at night... where exactly do we put all this? My numbers could be wrong, and this is assuming a lot... if anyone has more solid numbers, please chime in.
              But, we come back to the same issue... let's say we have 10 datacenters that need 10GW each... that'd be 100 million panels... we'll end up cove

  • ... all their climate destroying economic growth? Concrete dwarfs many other carbon contributors, and last time I went to California there was a f-ton of concrete. They even built roads out of the stuff. But pay no attention to that, look over here, we just stopped using coal!
    • by shilly ( 142940 )

      That is a separate part of the problem that also needs tackling, but electricity emissions are 8 to 10x larger than cement (inc concrete) manufacturing in California. The biggerr buckets are transportation, industrial non-electric, commercial and residential fuel, agricultural, recycling, and things like refrigerants. Of those, transportation, industrial non-electric and fuel are the most important to tackle, and a giant chunk of transportation and fuel can and is being addressed through electrification, wh

    • by skam240 ( 789197 )

      So because no one has solved the concrete problem yet all reductions in emissions are pointless? What a special person you are.

    • ... all their climate destroying economic growth? Concrete dwarfs many other carbon contributors, and last time I went to California there was a f-ton of concrete. They even built roads out of the stuff. But pay no attention to that, look over here, we just stopped using coal!

      [sarcasm]Yes because no other state or country uses concrete any more. Red states avoid concrete entirely as concrete is too "woke". Texas replaced concrete is their massive highway system with hopes and prayers. [/sarcasm]

  • California electricity rates will increase from $.45/kWh to $.65/kWh.
    • Correct. Science and technology works completely backwards in the US compared to in the rest of the world. Outside the US, renewables only get cheaper, despite massive fossil subsidies, and is overtaking the electricity production.
      • Exactly! Just look at what China is doing with solar and wind. They will soon be energy independent.
        Meanwhile Trump will have more coal than he knows what to do with while places like California (4th largest economy in the world) live on renewables.

    • by q_e_t ( 5104099 )

      California electricity rates will increase from $.45/kWh to $.65/kWh.

      Evidence?

      • by v1 ( 525388 )

        not evidence, just FUD

        One way or another, cost of solar is only going down, and cost of coal is only going up. Even at those rates, it'll eventually reach and then cross parity.

  • They said the state should be crashing out regularly due to renewables not working at night, in bad weather, or something. You're not saying that conservatives... misled people, are you?

    Although I do fully expect some data centers to cause a headache due to extremely high power consumption. Any state receiving a new data centers should note that those are high draw facilities, and as a friend noted, have them pay a floating surcharge until the power utility is able to bring extra capacity online to keep
    • by smoot123 ( 1027084 ) on Monday October 13, 2025 @11:10AM (#65721500)

      They said the state should be crashing out regularly due to renewables not working at night, in bad weather, or something.

      I'm not sure anyone said converting from coal to natural gas was a problem. That part worked great and I'm perfectly happy with that. Switching to natural gas played a large part in getting off coal, mostly because it was a whole lot cheaper than coal. It would be cheaper yet if the state allowed fracking for natural gas here.

      Converting to solar/wind and batteries is demonstrably feasible, the battery part of which does surprise me a little. It was predicted to be quite expensive, not impossible. Some quick searching says we pay about 66% more per kWh than the rest of the country. I don't know how much that is due to just everything being expensive here and how much due to different costs for solar, wind, and natural gas (which I realize are controversial and are rapidly changing).

      The good news is California energy demand is highest on hot, summer days, which are hot because the sun is shining brightly. That's pretty close to an ideal case for solar plus a moderate amount of batteries (peak capacity and demand are only off by about 3-4 hours).

      • But, that 10GW datacenter is running 24/7... what about then? Because we've gotta have our AI slop all the time.
        And, when we run out of shale gas... go back to drilling for oil for NG and mining coal for NG, even though we don't use either oil or coal anymore.

        • But, that 10GW datacenter is running 24/7... what about then? Because we've gotta have our AI slop all the time.

          No doubt, AI is, and this caught me by surprise, is dramatically increasing the base load demand. Who saw that coming five years ago?

          That said, a number of people, the abundance and/or free market crowd, have pointed out that just replacing existing electricity generation with green sources isn't nearly ambitious enough. What we want is to triple or quadruple the energy available to all humanity because having access to inexpensive, reliable, and plentiful energy seems to be a necessary precondition to mate

          • So, if there's shale under your backyard, it's fine for them to set up shop and frack through your garden?
            Something like 60 trillion cubic feet... of course, that's through fracking, which has it's own environmental issues.

            • So, if there's shale under your backyard, it's fine for them to set up shop and frack through your garden?

              It sure is. I honestly don't care if someone is fracking a mile or two beneath my garden. The US has been sorting out the laws regarding mineral rights for at least 150 years so maybe they would owe me something, maybe not. But in terms of safety or security, I have no issues at all.

              That's a bit of a strawman though. Crowded as it can be, California still has vast sparsely populated areas. If you wanted to start fracking, the natural choice would be to start in areas with lots of shale and few people. I gua

  • The article seems to indicate they have solved tis issue but did not elaborate.
  • by w3woody ( 44457 ) on Monday October 13, 2025 @07:12AM (#65721118) Homepage

    When I used to live in Glendale, California, I noted from reports from the Glendale DWP that most of the power used by the city--and by the state--was imported from places like Utah. Power would be generated in Utah, then shipped by power transmission lines to Glendale.

    Will California also stop importing electricity from coal-fired plants outside of the state? Or is this simply virtue signaling by the state as they continue to export their pollution?

    • Did you bother to read even just the summary?

      • by w3woody ( 44457 )
        They were not the only source of fossil fuel generated power being imported from Utah.
        • by skam240 ( 789197 )

          So the answer to the above's question is still "no" then.

        • Read TFA. Almost all of California's coal-sourced electricity comes from Intermountain. Shutting that down effectively eliminates the use of coal as a source of grid energy in California.

    • When I used to live in Glendale, California, I noted from reports from the Glendale DWP that most of the power used by the city--and by the state--was imported from places like Utah. Power would be generated in Utah, then shipped by power transmission lines to Glendale.

      I live in Utah... I wonder what effect this will have on my power prices.

  • by necro81 ( 917438 ) on Monday October 13, 2025 @08:20AM (#65721176) Journal
    The last coal-burning power plant [grist.org] in New England produced its last electricity a few weeks ago [nhpr.org], and the owners are starting decommissioning [concordmonitor.com]. It had been operating only as a supplemental power source for years - providing guaranteed reserve capacity for especially hot or cold days. But even the guaranteed payments for that were no longer profitable. The owners intend to repurpose its 500-MW grid connection for battery storage, and the sprawling acreage with a solar park.

    For the first time since the grid got started, New England's electricity is now coal-free. The sky has not fallen.
  • What difference does it make to global warming? Are they counting leaked methane?
  • Conspiracy theorists say this is the reason for the oil refinery explosion in southern CA recently.
  • ...meaning calif electricity rates will be going up big time.

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