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Earth Technology

Coal Plants Get New Lease On Life With Natural Gas 143

HughPickens.com writes Christina Nunez reports in National Geographic that in the past four years, at least 29 coal-fired plants in 10 states have switched to natural gas or biomass while another 54 units, mostly in the US Northeast and Midwest, are slated to be converted over the next nine years. By switching to natural gas, plant operators can take advantage of a relatively cheap and plentiful US supply. The change can also help them meet proposed federal rules to limit heat-trapping carbon dioxide emissions from power plants, given that electricity generation from natural gas emits about half as much carbon as electricity from coal does.

But not everyone is happy with the conversions. The Dunkirk plant in western New York, slated for conversion to natural gas, is the focus of a lawsuit by environmental groups that say the $150 million repowering will force the state's energy consumers to pay for an unnecessary facility. "What we're concerned about is that the Dunkirk proceeding is setting a really, really bad precedent where we're going to keep these old, outdated, polluting plants on life support for political reasons," says Christopher Amato. Dunkirk's operator, NRG, wanted to mothball the plant in 2012, saying it was not economical to run. The utility, National Grid, said shutting it down could make local power supplies less reliable, a problem that could be fixed by boosting transmission capacity—at a lower cost than repowering Dunkirk. Meanwhile the citizens of Dunkirk are happy the plant is staying open. "We couldn't let it happen. We would lose our tax base, we would lose our jobs, we would lose our future," said State Sen. Catharine M. Young. "This agreement saves us. It gives us a foundation on which to build our economy. It gives us hope. This is our community's Christmas miracle!"
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Coal Plants Get New Lease On Life With Natural Gas

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  • by Anonymous Coward

    Apparently environmentalists themselves. Perfect is the enemy of good. If one were to be cynical one would suggest that environmentalists only want sources of energy that are expensive and unreliable because the availability of abundant energy sources won't strike a stake through the heart of capitalism and consumerism.

    • by amiga3D ( 567632 )

      People are the source of all pollution. If we could just get rid of all the people then there would be no more pollution.

    • by Anonymous Coward

      If one were to be cynical one would suggest that environmentalists only want sources of energy that are expensive and unreliable because the availability of abundant energy sources won't strike a stake through the heart of capitalism and consumerism.

      See, this is what happens when folks get "informed" from the the mass media. Their conception of issues is with sound bites explained by ignorant pundits.

      Issues are very complex and are never black and white as the media will portray them - even the beloved Jon Stewart and John Oliver over simplify things and spin things to play to their audience.

      And don't get me started on how most of the web is just shit - personal propaganda.

      Everyone has a bias but sources such as books and magazines (Discover, Scientifi

    • by necro81 ( 917438 )

      If one were to be cynical one would suggest that environmentalists only want sources of energy that are expensive and unreliable

      Or they could, ya know, maybe use less energy. There's plenty of low-hanging fruit in using what energy we can produce more efficiently, which obviates the need for any new generation, or allows old plants to be mothballed. It doesn't mean shivering in dark caves: humans, particularly Americans, are fantastically thoughtless and wasteful when it comes to energy.

      Rather than

      • that sounds great. I await your proposal to see if there is actually anything that iis less than 150 million that would last as long as this plant will, and cost the consumer the same or less per KWH.
        • by jbengt ( 874751 )
          I work in the HVAC field, and believe me, there is plenty that can be done relatively cheaply to reduce energy use. It is starting to happen now, but it could have been done 30 years ago if it weren't for the inertia of the construction industry.
          • ok.... so...examples... or are you just plugging you HVAC skills???
            • by jbengt ( 874751 )
              Turning things off when they are not needed.
              DDC controls with better algorithms and controlling more building systems.
              More efficient pumps, fans, motors, etc.equipment.
              More use of variable flow pumps and fans.
              Increased insulation.
              Better performing windows.
              Heat recovery between outside air intake and exhaust.
              Gas fired heating equipment that use low flue temperatures to capture the heat of condensation from water vapor in the flue gases.
              Lower wattage lighting.
              Architects paying attention to the orient
              • all those things are fine indeed, in fact ive done most of those things over the years. but that doesnt change where the energy comes from. as you said that is the big elephant in the room that environmentalists seem to always forget. the energy still has to get to the home
  • One community's "Christmas miracle" is another community's environmental and tax burden, another private company's windfall at the expense of the public interest, another and apparently another generation's problem.
  • Natural gas is better if you use a combined cycle gas turbine plant, where the natural gas is burnt in a what amounts to a jet engine and then the exhaust is used to heat water for steam turbines.

    If you just replace coal with natural gas in the same plant to heat the water it is not significantly less CO2, though it will likely be less other pollutants.

    • Please don't bring logic and engineering to the discussion, we're busy blaming liberals and environmentalists for resisting another corporate handout. After all, it's the "envirwackos", not the NIMBY soccer moms and the timid capitalists keeping us from having a shiny nuclear plant on every block. We NEED to be spending public money to "upgrade" privately-owned, already-amortized and obsolete coal plants to inefficiently burn natural gas. It's a Christmas miracle!
    • by Anonymous Coward

      Natural gas is better from the get-go, in that only half as much CO2 is emitted per unit energy.
      And fewer particulates to boot.

      It is a "bridge" fuel to a cleaner future, and a very reasonable/practical short term measure
      to implement while our Mr. Fusion home reactors are developed.

    • by necro81 ( 917438 ) on Friday November 21, 2014 @09:00AM (#48432895) Journal

      If you just replace coal with natural gas in the same plant to heat the water it is not significantly less CO2

      Burning coal is pretty much just turning bulk carbon into carbon dioxide. Burning natural gas (methane, CH4) creates carbon dioxide, too, of course, but also releases energy from burning the hydrogen to make water. As a result, the combustion of natural gas produces less CO2 for the same energy output.

      From the Energy Information Agency [eia.gov] - Pounds of CO2 emitted per million BTU of energy:
      Coal (anthracite): 228.6
      Gasoline: 157.2
      Natural Gas: 117.0

      [I'll apologize for the units - I'm just quoting the result. If you must know, 1 lb / 1e6 BTU is equivalent to 0.43e-3 kg/MJ. Or, just look at the number as a figure of merit: lower is better.]

      more data here [eia.gov]

      • by dj245 ( 732906 )

        If you just replace coal with natural gas in the same plant to heat the water it is not significantly less CO2

        Burning coal is pretty much just turning bulk carbon into carbon dioxide. Burning natural gas (methane, CH4) creates carbon dioxide, too, of course, but also releases energy from burning the hydrogen to make water. As a result, the combustion of natural gas produces less CO2 for the same energy output. From the Energy Information Agency [eia.gov] - Pounds of CO2 emitted per million BTU of energy: Coal (anthracite): 228.6 Gasoline: 157.2 Natural Gas: 117.0 [I'll apologize for the units - I'm just quoting the result. If you must know, 1 lb / 1e6 BTU is equivalent to 0.43e-3 kg/MJ. Or, just look at the number as a figure of merit: lower is better.] more data here [eia.gov]

        It is even more effective than that- these numbers don't take plant efficiency into consideration. The "per million BTU of energy" is just the amount of heat produced, not the amount of electricity. A very efficient traditional coal plant is about 35-40% efficient in turning the heat into electrical power. A typical combined cycle gas power plant is about 57-60% efficient due to the nature of the different cycle. So, on a per-MW produced basis, Natural gas looks a lot better.

        It also doesn't hurt that

        • From what I understand these are retrofits. They will reuse as much equipment as possible so you can probably forget the combined cycle advantage.

    • If you just replace coal with natural gas in the same plant to heat the water it is not significantly less CO2

      Yes it is. Combustion of a kg of methane will generate 55 MJ of heat. Combustion of a kg of coal will produce about half as much energy, while generating 1/3 more CO2. That is a big win. Source: Heat of Combustion Tables [wikipedia.org].

    • by gewalker ( 57809 )

      Combined cycle plant are a remarkable piece of engineering and a truly more efficient.

      However, most of the natural gas plants being built are not the high efficiency plants. There are the older, cheaper (capital cost) design since they are primary used for peak load conditions since they can spin up much fast than coal plants.

      Natural gas is is also much worse than coal in terms of price volatility. In the US, gas is cheaper than coal, although last winter in the Northeast it was much higher than coal during

      • by jbengt ( 874751 )
        Don't worry, if the Saudis pump the price of oil below $70/bbl, all new fracking will stop and the cost of using natural gas will rise well above coal within a year or two.
  • Dependency (Score:2, Insightful)

    It gives us a foundation on which to build our economy. It gives us hope.

    , said the addict.

  • "We couldn't let it happen. We would lose our tax base, we would lose our jobs, we would lose our future," said State Sen. Catharine M. Young. "This agreement saves us. It gives us a foundation on which to build our economy."

    It seems to me that if they were going to use the local power plant as a foundation for building the local economy, they might have gotten around to that by now. The plant has been there for decades, right? Looks to me like they squandered their chance as diversifying their tax and
    • by gtall ( 79522 )

      Yes, but this is in New York State and upstate NY at that. NYS has been taxing the living hell out of corporations for decades. It started under Rockefellar, Rocky never saw a tax he could resist. The Unions did their bit, and county governments did their bits...all to screw any enterprise that was productive out of their money. Dunkirk probably couldn't do much on its own.

    • It seems to me a local utility can either generate power, mark up over cost, and pay taxes on profits; or import power, mark up over cost, and pay taxes on profits. These are the same. They claim they would lose jobs, but wasteful spending creates economic strain and reduces the total eventual jobs: in 5 years, moving to the cheaper option would provide a stronger and more robust economy.
    • One of our townships in Michigan is in the same boat, except most of the power produced there is exported to New York; a lot of townships in Ontario are in the same boat, except most of the power produced there is exported to New York. We could save a lot of CO2 emissions by just stopping electricity from being imported by metro New York City.

  • This is a temporary Measure at best. I see alot of anti-liberal and pro-conservative posts here. Let me make myself absolutely clear:

    I'm not pro-development, I'm anti-living-in-the-past and reactionary-ism.

    I don't think that cars are a bad thing in and of themselves. I think that cars burning petroleum is a bad thing. We should have cars, everyone needs cars, modernity is built around people having cars. But our cars should not be burning Petroleum. They should run on Electricity or some other Fuel source.

    • the problem is none of us disagree with you

      We disagree with the speed in which you expect it to be done. It will take time to bring the price of all those other things down to be affordable for the masses. a tesla model S, while I would LOVE to own one is simply out of my, and most others price range at this time. Not to mention if we all switched to electric cars overnight, what does that do the the power grid? increased demand means increase in energy needed to be produced. how do we get there?
      • by jonwil ( 467024 )

        There are plenty of ways to make cars better without going all-electric-all-the-time. Firstly they need to close all the loopholes in the fuel economy regulations that give free passes to big gas guzzling SUVs and crossovers (like the one that doesn't count them for fuel economy purposes if they happen to be capable of running on E85 even though most of them will never see a drop of E85 in their lifetime or the loophole that made the ugly-as-sin PT Cruiser count as a truck when it clearly wasn't or the regu

        • the issue is that most crossovers and suvs are not much more fuel efficient. Hell our kia sorento gets over 30MPG and my pontiac grand am barely gets 20 for example
    • by dave420 ( 699308 )

      Not everyone needs cars. Just pointing that out. Where I live many people don't have or need cars, because public transportation is so well developed. The public transportation uses electricity, which reduces the amount of pollution in the city center, and the electricity itself is created through environmentally-friendly means.

      I think if you said "everyone needs transportation" that would be more accurate, but we could point out people that don't need transportation, and get nowhere :) No pun intended,

    • Low-density, high-impact shit like solar panels and hydroelectric dams? Sure, let's bulldoze the environment.
      • Low-density, high-impact shit like solar panels and hydroelectric dams?

        Hydroelectric dams I'll give you. Insofar as there is anything to give. All useful rivers that can be dammed for power already have been, on this continent. There will be no more hydroelectric dams built in North America.

        But solar panels? Solar panels are not high impact, despite being low density. There are 100 million roofs in the US. Factor in all the deficits and that's still a monstrous amount of power. We just have to use it. And the roofs are already there, so the deployment impact is zero.

        • Managing a distributed solar infrastructure is a nightmare. The companies that do so charge as much as your main utility.

  • just guessing here - Fracking?

  • And yet there are news stories all over the place about how BECAUSE OF the mass switch to natural gas, my electricity bill is going up double digits...

  • Natural gas produces just as high a greenhouse gas effect as coal.
    http://environmentalresearchwe... [environmen...rchweb.org]

    This gas fever needs to get real.

  • There are now much stricture environmental limits on metals emission like toxic mercury. Not having to add expensive scrubbers is as much of motive for converting to natural gas as cost. 40% less CO2 emissions per megawatt is not a primary motive but a beneficial side effect.

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