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Power China Technology

Solar Power Is Now As Inexpensive As Grid Electricity In China (ieee.org) 195

An anonymous reader quotes a report from IEEE Spectrum: Solar power now costs the same as, or less than, electricity from the grid in many of China's cities, a new study finds. This research may encourage broader adoption of industrial and commercial solar power there. Advances in solar technology have helped bring solar within reach of grid parity sooner than expected in China. Whereas the cost of solar photovoltaic electricity there was up to 15.1 Chinese yuan per kilowatt-hour in 2000, it was only up to 0.79 Chinese yuan per kilowatt-hour in 2018. In addition, in 2018, the Chinese government dramatically cut subsidies to the solar photovoltaic industry to drive it to compete with coal without government aid.

To see where Chinese solar energy stood now, scientists in Sweden and China analyzed the net costs and profits associated with building and operating industrial and commercial solar energy projects in 344 prefecture-level cities in China. They found in all 344 cities, solar photovoltaic systems were capable of generating and selling electricity at lower prices than the grid without subsidies, and in 22 percent of those cities, they could also produce electricity at lower prices than coal. The scientists detailed their findings in the 12 August edition of the journal Nature Energy.

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Solar Power Is Now As Inexpensive As Grid Electricity In China

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  • by SuperKendall ( 25149 ) on Tuesday August 20, 2019 @07:15PM (#59107646)

    This sounds like great news as China is both a huge polluter and huge user of coal plants.

    So if solar energy is really as cheap as grid electricity, then even now shouldn't we be hearing news of halting the construction of new coal power plants there, and plans for existing power plants to be shut down?

    If nothing else they would have huge motivation to do this to help clean up the air.

    it seems like if coal plants are not being shut down, there has to be some hidden cost not uncovered by this report.

    • by CrimsonAvenger ( 580665 ) on Tuesday August 20, 2019 @07:28PM (#59107666)

      it seems like if coal plants are not being shut down, there has to be some hidden cost not uncovered by this report.

      Umm, no.

      China is still trying to industrialize in a big way. Which means they won't be shutting down existing power plants until they have been replaced. Nor are they going to build a power plant halfway, then stop in mid-construction.

      What you should be looking for is all new construction started in the future should be solar. If, as you say, there are no hidden costs (like, lack of 24/7 utility from solar)....

      • What you should be looking for is all new construction started in the future should be solar. If, as you say, there are no hidden costs (like, lack of 24/7 utility from solar)....

        Storage - day to night and sunny to several cloudy days - at utility scale is also a solved problem.

        One solution is vanadium redox flow batteries. (Power limited by size of cell stack, energy storage limited by size of tankage.) That's achieved some utility-scale deployment in New Zeeland. As I understand it the reason it isn't

        • It's the cost of battery storage causing it not to be deployed. It has nothing to do with patents.

          When solar attaches a battery to go 24/7, it becomes more expensive than coal or gas.

          • by blindseer ( 891256 ) <blindseer@noSPAm.earthlink.net> on Wednesday August 21, 2019 @12:17AM (#59108200)

            When solar attaches a battery to go 24/7, it becomes more expensive than coal or gas.

            Not only that but the energy required to create these batteries, and with the losses in charging and discharging the batteries, it is quite possible that there is a net loss of energy. It's quite possible for this to be energy positive but the energy gain would be so small that it cannot support a modern economy.

            Here's an explanation of the problem.
            https://www.forbes.com/sites/j... [forbes.com]

            If someone wants to argue about the numbers in the article then that's fine. What is quite clear is that the gap between solar + batteries and just about anything else we can come up with is far too wide for some tweaks in the technology to close. We need to leave solar power to pocket calculators and communication satellites. For grid power we should use onshore wind, hydroelectric dams, and nuclear fission.

            • So as far as your concerned all it takes is one pro nuke blogger to invalidate the potential for solar power...

              It's obvious solar produces more energy than it takes to make them.*(links follow) And it's just been shown to you to be more profitable than coal in a lot of places. People making solar panels aren't stopping you from doing whatever your pet energy project is.

              Even if you weren't completely wrong. Not everything needs to have the energy return of coal to be useful.
              It takes a lot more effort an

              • So as far as your concerned all it takes is one pro nuke blogger to invalidate the potential for solar power...

                No, it takes only one person with good data.

                Your links on the EROI of solar PV are irrelevant to my claim. I pointed out that the EROI of solar with batteries is too low to bother. There's far better ways to get reliable energy than solar PV panels and batteries.

                Even if you weren't completely wrong. Not everything needs to have the energy return of coal to be useful.

                That's true, but if something is going to replace coal then it should should have a better EROI than coal. There's certainly other factors to consider but if the EROI of solar with batteries is 2, and the EROI of coal is over 20, then it's going

              • This guy is constantly citing outdated and/or twisted data. I mean, the first graph in the chart is from the notorious Weißbach study, which, for example, considers late 1990s turbine technology for its numbers. This is for a study published in 2010s. It also places completely unrealistic restrictions on solar power, such as throwing half of it away and passing the whole rest of it through multi-day storage - restrictions that don't appear in ANY realistic grid model (for example, typical curtailment l
              • Anyone reading Forbes, is most likely intentionally looking for false information to promote an agenda. What is yours?
                He has no agenda.

                He is simply an idiot.

                If he was a paid troll he would post in other forums (/. is to small) and would be very much smarter.

            • Not only that but the energy required to create these batteries, and with the losses in charging and discharging the batteries, it is quite possible that there is a net loss of energy. It's quite possible for this to be energy positive but the energy gain would be so small that it cannot support a modern economy.

              Obviously, any time when there is 100% storage efficiency, there's net loss in energy. If 100 joules go in and 90 joules go out, you have net loss of energy. What a discovery you've made! Except that means diddly-squat for whether the storage system is useful or not. Phone batteries already do that in almost everyone's pocket. Does this mean that batteries can't support modern telecommunications?

              • Sorry, "where there isn't 100% storage efficiency", obviously.
              • You mean 100 Joules of electricity going in and 90 Joules of electricity coming out with 10 Joules leaving as heat energy. Energy cannot be destroyed or created, just converted.

            • and with the losses in charging and discharging the batteries,
              Both are 99% efficient, so in total 98%.

              I mentioned to you already several times: if you have no clue, stay out of discussion.
              Ah, no, I don't provide links for basic physics you should have learned in school, google yourself or try wikipedia.

              And the only link you again provide is from a news site which is known to be biased, rofl.

            • No there is no net loss. JFC.

              And it's 2019 and I really shouldn't have to point this out . . .:
              EROI doesn't include the costs generated by using petroleum products such as coal.
              The health care cost of the US alone fro disease cause by pollution fro the source are between 240 Billion, to 780 Billion.
              50% of medicare cost is do to pollution caused illness, mostly from cars and coal byproducts.

              Hmm, why do the take cost for the PV creation into account for solar, But don't take the cost of getting fuel for coal et. al.?
              Could it be because solar fuel is free? naw, that can't be it in that Forbes POS biased article.

              Which reminds me: Forbes stopped being a good source over a decade ago.

          • Grid battery storage with solar is designed for time displacement of a few hours to effectively move the peak solar time into evening time were peak electricity demand is. This scenario does not need the batteries to supply power for 24 hours, more like 2 to 3 hours of peak electricity demand.

            If you want to store electricity for days, weeks or even months for summer to winter time displacement then batteries are not the solution due to self-discharging.

            Medium to long term storage of electricity would need a

          • by geekoid ( 135745 )

            "When solar attaches a battery to go 24/7, it becomes more expensive than coal or gas."
            That is blatantly false. Please stop lying.

        • by Cyberax ( 705495 )
          The problem with vanadium flow batteries is that they're HUGE. Really impractically huge, mostly because vanadium salts are quite diluted. There were some news about new advances allowing more concentrated liquid electrodes, but so far nothing came out of it.

          As for patents, patents on vanadium flow batteries have long since expired.
    • This sounds like great news as China is both a huge polluter and huge user of coal plants.

      So if solar energy is really as cheap as grid electricity, then even now shouldn't we be hearing news of halting the construction of new coal power plants there, and plans for existing power plants to be shut down?

      If nothing else they would have huge motivation to do this to help clean up the air.

      it seems like if coal plants are not being shut down, there has to be some hidden cost not uncovered by this report.

      1) "China is both a huge polluter and huge user of coal plants." -redundant

      2) "So if solar energy is really as cheap as grid electricity, then even now shouldn't we be hearing news of halting the construction of new coal power plants there, and plans for existing power plants to be shut down?" - The massive ship is slow to steer, be patient, 4 seconds have passed.

      3) "If nothing else they would have huge motivation to do this to help clean up the air." - Yes. in fact is a big part of the reason ( not all of

      • by SuperKendall ( 25149 ) on Tuesday August 20, 2019 @11:00PM (#59108078)

        The massive ship is slow to steer, be patient, 4 seconds have passed.

        Here's the thing though, the drop in solar costs has actually been pretty predictable for some time, as were construction costs for current and future power plants.

        Now I agree with others that it doesn't make sense nessecarily to stat shutting down existing plants, but it seems like they had a lot planned and I've not heard of them being dropped yet. The long term calculations the Chinese have done probably have put the true break even point a bit more out, maybe 3-5 years...

        But there is enough knowledge of all the factors that they should be turning the ship way in advance of a third party report like this.

        • by AmiMoJo ( 196126 )

          Politics and power companies wanting to keep generation centralised are both issues too.

          The same issues that mean even in the US there is still a lot of coal and gas used, even though wind is cheaper [lbl.gov].

      • -Again the ship, remember how the titanic couldn't evade the iceberg? Well large governmental bureaucracies turn even slower. Hell no one even realizes that literally ALL of the financial gains the American economy has been experiencing for the last 2 years is still the "steering" of the Obama administration.

        That, plus a huge round of tax cuts which added a trillion $$$ per year to the economy.

        (but which will have to paid back soon)

        But it's gonna wear off and we'll start seeing the "trump" magic at work very soon.

        Six bankruptcies so far, now heading for the seventh.

        If I was a Democrat in the USA I'd be voting Republican in the next couple of elections, just so the GOP gets to be fully responsible for the disaster.

    • by ShanghaiBill ( 739463 ) on Tuesday August 20, 2019 @08:30PM (#59107782)

      it seems like if coal plants are not being shut down, there has to be some hidden cost not uncovered by this report.

      The "hidden" cost is sunk capital. Except it is not hidden.

      A big part of the cost of coal power is paying for the capital cost of constructing the plant, and the interest on that expense. That cost does not go away when you shut down the generators.

      Solar is now cheaper than building and running new coal plants. It needs to get MUCH cheaper before it is cheaper than just the operating cost of existing coal plants.

      There is also the "sunset problem": the sun doesn't shine at night. Panels are cheap. Batteries are not.

      • It needs to get MUCH cheaper before it is cheaper than just the operating cost of existing coal plants.

        Like what's happening with wind?
        "There are some scenarios, in some parts of the U.S., where it is cheaper to build and operate wind and solar than keep a coal plant running," said a Lazard banker who was involved in the report. "You have seen coal plants shutting down because of this."
        https://www.cbsnews.com/news/i... [cbsnews.com]

      • by jlar ( 584848 ) on Wednesday August 21, 2019 @12:22AM (#59108210)

        The main hidden cost is that you need backup power plants or massive power storage to supply power when the sun is not shining. And these power plants have to be able quickly scale up/down the power production leaving out nuclear plants. This means that even with 100% solar (or wind) power coverage you still have to pay the capital costs for the coal plants. For a fair comparison of costs these costs should actually be put on top of the solar costs.

        • If you have a large enough grid, the sun is always shining, or the wind is always blowing.

          • If you have a large enough grid, the sun is always shining, or the wind is always blowing.

            At midnight, the closest place with sunshine is 10,000 km away.

        • by AmiMoJo ( 196126 )

          Well fortunately wind is also cheaper than coal and natural gas [lbl.gov] so you can have a mix, which with a country the size of China greatly reduces the amount of storage and backup you need.

          Europe really needs to ramp up battery production. At the moment we are reliant on Chinese and Korean batteries mostly, and we really should get a piece of that pie for economic and security reasons. Grid scale is a great way to create more demand to get those factories off the ground.

        • by skullandbones99 ( 3478115 ) on Wednesday August 21, 2019 @10:47AM (#59109314)

          If you look at the UK coal fired power stations, they are being closed down one by one. They were used for so-called "backup" but "backup" from coal is no longer needed due to:

          1. Increase in the number of solar and wind farms that have been deployed so capacity has increased.
          2. Increase in the number of natural gas fired power fired power stations deployed
          3. UK is increasing the capacity of the inter-connect power cables between the UK and France, Norway and Ireland so more renewable (hydro from Norway) and Nuclear from France can be imported.

          Coal power in the UK will be totally gone by 2023. UK coal power is dead, the biggest UK coal power station called Drax got converted into a biomass burning power station a few years ago.

          The UK will use natural gas fired power plants for baseload, peak time demand and for backup.

        • Not saying you're wrong, though China also has a different way to help addressing the issue -- building extremely long ultra high voltage power grid [ieee.org] known as "supergrid". Like every other infrastructure projects in China, the supergrids are giantic, carrying electricity from solar and wind rich western regions to highly industrialized (but cloudy) eastern regions over thousands of kilometers.

          The sheer scale of the new line and the advanced grid technology that’s been developed to support it dwarf anything going on in pretty much any other country. And yet, here in China, it’s just one of 22 such ultrahigh-voltage megaprojects that grid operators have built over the past decade.

          [State Grid engineers] argue that the country must move far more energy via UHV DC to maximize the use of renewable energy while slashing reliance on coal.

      • Newly installed solar panels were cheaper than new coal power in 2008, solar went cheaper than old paid for coal plants in about 2016-2017 when installed in utility scale when installed panel prices fell below $1 a watt (actual panel prices are less than $0.30 a watt even with 30% tariffs.

        Each year solar/wind drops about 20% in cost, it's currently so cheap that between solar, wind and gas they are closing coal plants as fast as they can. Since 2010 Coal has gone from almost 50% of US generation to less tha

        • by AmiMoJo ( 196126 )

          Reference for wind prices being lower than gas now: https://emp.lbl.gov/sites/defa... [lbl.gov]

          It's amazing how fast this has happened. I remember a comment here on Slashdot from about 10 years ago, which sadly I can't find now but the gist of it was a prediction that electricity would become something that was only intermittently available when conditions were favourable, and extremely expensive. In a decade we have gone from "it's impossible" to "it's inevitable".

        • Each year solar/wind drops about 20% in cost...

          And as stupid as this is, it's what's keeping me from installing solar panels. Looking at the ROI, waiting another year to buy panels is close to the same savings as buying them now and getting the free power over that year, with no need for me to pay out of pocket or go into debt. No risk.

          I'll probably wait until 2021, as that's the last year of the big federal tax incentive. They're sunsetting that tax credit by dropping it a few percent a year, but that's slower than panel costs are coming down. In 2022

      • by idji ( 984038 )
        You also have the cost of coal in kids getting asthma from fine particles and disease/damage from sulfur and the long-term effects of lead poisoning - I don't see the coal companies paying for that. And uranium/thorium particles, etc... Let coal die. We don't burn whale oil and we don't need coal.
        Don't worry about the sunset problem! People can charge their laptops and small batteries to watch TV in the evening. You put on the air conditioner and do your washing, vacuuming through the day. There is a l
    • by gtall ( 79522 )

      China is a big country and won't turn on a dime. Plus, there is all the sunk costs of the existing coal infrastructure. The creditors will want to realize some profit on their investment. And the state owned enterprises have a stake in the coal economy. The U.S. has a leg up in this regard with no state owned coal enterprises...although the alleged administration would like to have them.

    • So if solar energy is really as cheap as grid electricity, then even now shouldn't we be hearing news of halting the construction of new coal power plants there, and plans for existing power plants to be shut down?
      Not insightful, but stupid.
      A new power plant would cost in the US something like $10billion. It is already constructed to the point of $8billion, who in the world would throw away that investment?

      it seems like if coal plants are not being shut down, there has to be some hidden cost not uncovered b

    • by geekoid ( 135745 )

      It's just that they are transition AND dealing with an industrialization boom.
      The increase in coal plants turned out to be an unintended consequence of handing that decision making to the prefecture itself.
      There is no magic switch, just issues dealing with transitioning.

  • Great News! (Score:3, Interesting)

    by apoc.famine ( 621563 ) <apoc...famine@@@gmail...com> on Tuesday August 20, 2019 @07:42PM (#59107690) Journal

    Looking at my last electric bill, 25% was overhead and 75% was the electricity used. Once the cost per KWH of solar is on par with what I'm paying for straight electricity, it starts to make real sense to spend that other 25% on storage.

    Looking at Google Project Sunroof, it looks like I can generate 1.3x the amount of power we use annually with rooftop solar. The major issue is that we will have an excess in the summer and a deficit in the winter. For the near future, we'll need a grid connection. But man, are we close to being able to almost skip that.

    A decade ago, I would have laughed at anyone saying this. Now? From about March through October we could probably get away with just solar and a good sized battery pack. And while the battery is expensive, we're close to being able to come out even vs the monthly power bill. Another generation of battery tech and solar tech, and I could legitimately consider disconnecting from the grid. In suburbia. In the Northern US.

    I'm not surprised that China is closer, given a lower cost of living and proximity to the plants making both the panels and batteries.

  • Summon blindseer (Score:2, Insightful)

    by Ryzilynt ( 3492885 )

    Nuclear is obviously still way better, I mean they are likely using coal to feed the grid am I right? Don't even get me started on coal, it's the devil, today, obviously i mean in today's day and age coal is barbaric and unnecessary. It got the job done for a good stretch, but now it's about time to retire. Nuclear is where it's at am i right? ,Until something better comes along right? We aren't going to stick with one technology even if there is something better like they did with coal right? I mean w

  • by rmdingler ( 1955220 ) on Tuesday August 20, 2019 @07:51PM (#59107704) Journal

    As energy use escalates, it gets more expensive... this provides the impetus to either use less energy, or, implement more efficient forms of energy delivery.

    Even in mostly communist China, it is a self correcting system... unless market distortions are implemented, such as lobbied subsidies for existing generation methods or legislation to forbid new energy generation technology.

    • by HiThere ( 15173 ) <charleshixsn.earthlink@net> on Tuesday August 20, 2019 @08:06PM (#59107744)

      Despite the rhetoric, China is not a Communist state, and certainly not a communist one. It's a totalitarian oligarchy. The "party" certainly runs things, but the name is not the reality, and they aren't even attempting to be Communist. (This is reasonable, as any such attempt would fail.)

      FWIW, communism, as opposed to Communism, works fine at a small enough scale...say 20 people. I don't know of a scale at which Communism works, as I've never seen a working example.

      P.S.: The US doesn't seem to be a democracy, either. Perhaps a republic, in the Roman sense of the term. And I really have my doubts that an actual democracy would scale to nation size. It can certainly work well in groups of around 1000 people, or perhaps a few less. When you start needing mass media to communicate, however, I suspect you've gone beyond the tipping point for a classic democracy. Democracy depends on the voters actually knowing the candidates, not just what their PR flacks put out.

      • Despite the rhetoric, China is not a Communist state, and certainly not a communist one. It's a totalitarian oligarchy. The "party" certainly runs things, but the name is not the reality, and they aren't even attempting to be Communist. (This is reasonable, as any such attempt would fail.)

        FWIW, communism, as opposed to Communism, works fine at a small enough scale...say 20 people. I don't know of a scale at which Communism works, as I've never seen a working example.

        P.S.: The US doesn't seem to be a democracy, either. Perhaps a republic, in the Roman sense of the term. And I really have my doubts that an actual democracy would scale to nation size. It can certainly work well in groups of around 1000 people, or perhaps a few less. When you start needing mass media to communicate, however, I suspect you've gone beyond the tipping point for a classic democracy. Democracy depends on the voters actually knowing the candidates, not just what their PR flacks put out.

        It is fairly well known that the United States is a Democratic Republic, not a true democracy. The results of such are as apparent today as they have ever been.

        • It is fairly well known that the United States is a Democratic Republic, not a true democracy.
          No, the US is a money aristocracy. One where a "dynasty" is feared and the first one probably able to found one was assassinated but the first dynasty in action was tolerated and probably put into office by election fraud (at least that is how we europeans see it). On top of that only people who run a money intensive campaign have a chance to win. A money oligarchy. Obama was probably the purest man in history bei

      • by markdavis ( 642305 ) on Tuesday August 20, 2019 @08:34PM (#59107786)

        >"P.S.: The US doesn't seem to be a democracy, either. Perhaps a republic"

        The USA is a constitutional republic/representative democracy. So yes, it is a democracy (a representative one, not a direct democracy, which would NEVER scale well beyond a small group) and yes it is also a republic.

        • Why couldn't direct democracy scale with modern technology?
          • by HiThere ( 15173 ) <charleshixsn.earthlink@net> on Tuesday August 20, 2019 @11:07PM (#59108100)

            Because you've got to know the person you're voting for rather than only knowing their publicity.
            OTOH, a hierarchically embedded democracy might work, with each level actually knowing those in the level above that they voted for.

            • In a democracy you don't vote for the person you know or don't know, you vote for the topic.
              E.g. You want nuclear power: yes or no ...

              Look at Switzerland e.g.

              • In a democracy you don't vote for the person you know or don't know, you vote for the topic. E.g. You want nuclear power: yes or no ...

                Look at Switzerland e.g.

                Switzerland is a small country with a homogeneous relatively rich population with extremely strict immigration controls. If you think the US can be made more like Switzerland I'd love to hear more.

          • Technology does not create intelligence needed to understand the topic being voted on. That was the idea of representational democracy. Outsourcing the job to someone who full time can dedicate their life to getting informed opinions from their electorate, compare it to expert statements, and then bring benefit to you.

            None of that actually happens but that was the idea.

            Want to see direct democracy in action, look no further than the UK who willingly voted itself off an economic cliff. May I also suggest a h

            • by gtall ( 79522 )

              it isn't that none of that actually happens, it happens quite a bit. However, it also relies on Federal Agencies being relatively stable and staffed with experts who actually get policies and science, and are not dipshit hacks like the current crew.

          • >"Why couldn't direct democracy scale with modern technology?"

            Because there are too many issues and they are too complicated. The masses do not have the time, motivation, desire, or expertise to do what would be necessary for responsible voting. It would result in "emotional" voting- just casting votes on how something sounds or makes them feel. That is bad enough with a representative democracy, it would be disastrous for a direct democracy.

        • US states are representative democracies, but the federal government doesn't really qualify. 1/2 of one of the 3 branches of federal government in the USA is representative democracy (namely the house of representatives) -- so essentially 1/6th. The rest of the government involves votes in one way or another, but isn't a majority popular vote rule, so if you call that representative democracy you may have to call countries like Russia representative democracies.

        • It's a plutocracy. Insufficiently regulated capitalism poisons any attempt at truly representative democracy. Mix in Mango Mussolini and it starts to morph into fascism.

      • by phantomfive ( 622387 ) on Tuesday August 20, 2019 @10:25PM (#59107996) Journal
        I think the closest analogy to the modern Chinese government is to look at the ancient Chinese empire system.
      • It's difficult for communism to work when capitalist are constantly trying to subvert it. The fear is, if the world sees a successful, viable, vibrant, communism, that capitalism won't sell anymore in the market of ideologies. Hence why the US will support despots, weaken labor laws, and cut at the roots of societies to bring about "regime change."
        • Re: (Score:3, Insightful)

          by cbeaudry ( 706335 )

          communism fails because its a horrible ideology.

          History is clear on this. Crystal clear.

          • communism fails because its a horrible ideology.
            Which part: "everyone by his needs and everyone by his means" is horrible for you?

            • Slogans, do not an ideology make.

              1. For communism to function, it requires force;
              2. It ignores effort and ambition;
              3. It is counter to freedom.

  • Solar is a scam (Score:4, Interesting)

    by XArtur0 ( 5079833 ) on Tuesday August 20, 2019 @07:51PM (#59107706)

    If you have the land to waste, then go for it!

    >Tengger Desert Solar Park [China]
    43 KM^2 [Largest Photovoltaic Power Station in the World]
    Capacity: 1,547 MW
    Annual Net Output: ???
    Source: https://en.wikipedia.org/wiki/... [wikipedia.org]

    >Laguna Verde Power Station [Mexico]
    2 Boiling Water Reactors built by General Electric
    Capacity: 1,620 MW
    Annual Net Output: 4.782 TWh x 2
    Source: https://en.wikipedia.org/wiki/... [wikipedia.org]

    • I'm wasting the land on my roof? I could have a farm up there!
      • by Ichijo ( 607641 )

        If your building's roof is shared by only one household then yes, you aren't using land as efficiently as you could.

        If property taxes were proportional to land area rather than floor area, it would help provide the proper incentive not to waste land.

    • If you have the land to waste, then go for it!

      I have land to waste. On my roof. You do too.

    • by isorox ( 205688 )

      Solar Star (https://en.wikipedia.org/wiki/Solar_Star) has a net otuput of 1.6TWh/year for 13 sq km.

      The U.S. needs 4,090 TWh a year (https://en.wikipedia.org/wiki/Energy_in_the_United_States#Summary) for Electricity.

      That's 33,228 sq km at the same density of Solar Star

      The Mojave Desert alone is 124,000 sq km.

      The world's energy requirements (elecricty and non-electricity) is around 150,000 TWh, or 1.3m sq km.

      The Sahara Desert is 9.2m sq km.

  • Sure seems like his predictions on disruption are likely to come true. Maybe not as fast as he predicted but conceptually, it appears to be well underway. The thing about disruption is that few see it happening until it is too late. https://tonyseba.com/portfolio... [tonyseba.com]
  • by ishmaelflood ( 643277 ) on Wednesday August 21, 2019 @02:37AM (#59108380)

    Make sure they include the cost of storage or other generators to allow 24/7/365 power. In my off grid house I have 1500$ of panels, and $1800 of batteries, which would give me about 36 hours of backup, if we had 2 days with essentially 10% sun, which happens in winter. I could install even more batteries or a little generator. I went the generator route.

    It's easy to work things out if you have a simple isolated system, it is much harder with real systems, and these silly puff pieces always gloss over the practicalities.

  • Wal*mart China disagrees with regards to the overall cost.

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