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Australia Power

Rooftop Solar Helps Send South Australia Grid To Zero Demand In World's First (reneweconomy.com.au) 180

South Australia on Sunday became the first gigawatt scale grid in the world to reach zero demand when the combined output of rooftop solar and other small non-scheduled generators exceeded all the local customer load requirements. Renew Economy reports: The landmark event was observed by several energy analysts, including at Watt Clarity and NEMLog, where Geoff Eldridge noted that a number of measures for South Australia demand notched up record minimums for system normal conditions. It was later confirmed by the Australian Energy Market Operator, which noted that "scheduled" demand -- local demand minus the output of rooftop solar and small unscheduled generators such as small solar farms and bio-energy -- fell to minus 38MW in a five minute period at 1235pm (grid time, or AEST).

Minimum demand is now possibly the biggest challenge for market operators like AEMO, because under current market settings it needs to have a certain amount of synchronous generation to maintain system strength and grid stability. It does this by running a minimum amount of gas generation, and through the recent commissioning of spinning machines called synchronous condensers that do not burn fuel. It also needs a link to a neighboring grid, in this case Victoria, so it can export surplus production.

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Rooftop Solar Helps Send South Australia Grid To Zero Demand In World's First

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  • by Gravis Zero ( 934156 ) on Monday November 22, 2021 @09:15PM (#62012063)

    the CEO of southern Australia's largest coal power plant suffered a heart attack at approximately the same time. He was reported as saying, "I fear the day-star" before collapsing.

  • by CRC'99 ( 96526 ) on Monday November 22, 2021 @11:40PM (#62012277) Homepage

    It also doesn't mention that SA has the most expensive electricity in the country. It's not unusual to have 38c/kWh for usage, and over $1/day in supply charges in SA...

    Meanwhile, I'm in Victoria, and I pay 18.9c/kWh + 63c/day.

    All pricing in AUD...

    • Cost drives down demand, so demand meets supply?

    • This cost argument is out of date and has been for some time need to stop listening to coal apologists. I just checked the pricing, which I do now and then and this is a fair sample of the numbers. As at 17.25 Tues 23 Nov 2021 Qld - $77.88 NSW - $71.93 SA - $44.90 Vic - $44.36 Tas - $50.95
    • I live in South Australia, I am chaged 27c/kwh and 69c/day. Yes if you are dumb enough to use AGL (retail provider), you get slugged.
    • by AmiMoJo ( 196126 )

      Is that related to the high number of solar installations though?

      I guess it could be the reason why so many are buying solar panels.

    • It also doesn't mention that SA has the most expensive electricity in the country.

      Something which has nothing to do with the number of solar installations or the power mix, and everything to do with an ironic combination of both market deregulation as well as regulation mandating certain excessive performance requirements.

      Net result: A for profit company is screwing you, nothing more.

    • By making that energy expensive, it's encouraged rooftop solar, creating a huge distributed power grid located exactly where demand is without using any extra land. This removes the need to build large solar facilities on other land. Creating a market distortion carefully lets you guide the market in another direction.

      As rooftop becomes common it becomes easier and cheaper due to economy of scale, and moreover creates a habit/tradition of people getting rooftop solar, allowing it to continue from simple ine

      • In this way, the power utility can now focus on providing power in other ways for when rooftop solar does not meet capacity. Good stuff like nuclear, pumped hyrdro coupled with wind, etc.

        Nuclear is worthless for solving the climate crisis [cleantechnica.com]. Literally worthless. By the time we could get enough capacity built to matter it would all be over but the last few tears, and meanwhile it is literally the least cost-effective way to solve the problem, and for what? Literally nothing but enriching the people who profit from the mining and construction.

  • by ishmaelflood ( 643277 ) on Monday November 22, 2021 @11:42PM (#62012281)

    https://aemo.com.au/en/energy-... [aemo.com.au]

    26 jun -3 july, 66% fossil fuel.

    Don't believe the hype.

  • I suspect most readers of Slashdot are familiar with the "duck curve" but for those that are not here's a link to read up on it: https://en.wikipedia.org/wiki/... [wikipedia.org]

    Related to the duck curve is the "Nessie curve", so called because the curve goes "underwater" like the back of the Loch Ness monster, AKA "Nessie". This becomes problematic if there is not a means to store, or divert off the local grid, the excess capacity from all the solar power on the grid. Then as the sun sets the utilities on the grid need

  • I think it is time to decouple the signal and power components of the AC grid. Optic fiber is cheap especially compared to power lines. We can run optic fiber along the power lines and retrofit/replace active components so the timing is provided by the optics fiber. It can also exchange information about demand and generative capacity in various parts of the network. It is not simple, but could be done. This I think will enable an AC grid to function in these scenarios relatively efficiently.
    The other rou
    • by evanh ( 627108 )

      Not sure what signalling you're referring to but most grid operations will use independent data links for control and monitoring. Older grids use microwave ... and fibre on upgraded/new ones.

      As for HVDC, that gets used in special long links only. And will stay that way. Efficiently stepping the voltage needs a transformer. Transformers are highly robust, simple to build and are necessary, when in a hierarchical distribution, to provided stepping of voltage. Transformers don't work with DC.

      HVDC links re

      • I mean the sin waveform and phase timing info, also whether a device is allowed to send power or not. Heck we might even include real time pricing while we are at it.
        Right now if a solar inverter is able to send power back to the grid, it needs to (1) see some AC voltage in order to sync the phase and (2) interpret the presence of voltage as "the grid is working, you can send power". If the power line is at 0 - is it because of "no power" or is it because of maintenance ? Can a solar inverter or a power b
        • by evanh ( 627108 )

          Oh, you're talking about home generation and connections with local lines company.

          That could be done as ripple control. The lines company would instruct the home generation to limit its export. This would require the inverter to monitor the current flow on mains connection to the house. Which can be done at the main switch.

          Everything else is already in place. Phase synchronising is already built into every export capable inverter. No comms needed for that.

          Hybrid inverters that can maintain independent

    • Already being done in many places. In general I think wireless networking is more popular than fiber, because fiber offers orders of magnitude more bandwidth than is necessary for monitoring the grid and costs about that much more too.

      Putting fiber on the poles would be useful for providing internet access to rural communities, but is wholly unnecessary for grid monitoring.

  • Something about peak demand & daylight... blah, blah, blah... can't work... blah, blah, blah... because... blah, blah, blah... compared to nuclear... blah, blah, blah... only possible solution for everyone everywhere... blah, blah, blah... dichotomous arguments... etc.. Hey, I think I've got the hang of commenting about renewables now =)))
  • Many of the comments in this thread are sponsored by the international guild of investors in nuclear energy. Our motto is, "For every renewable energy project, there is an equal & opposite failed renewable energy project that can only be resolved with nuclear power." Next up, "Can we use nuclear energy for carbon capture so we can keep burning coal?"
  • by SerpentMage ( 13390 ) on Tuesday November 23, 2021 @01:22PM (#62013953)

    Ok yes I am cynical with my title, but hear me out. The UK has plenty of wind energy, and when it runs it does amazingly well. But oddly in the past few months there have been moments when there was not enough wind. In fact basically none. As a result the UK had to power up fossil fuels.

      https://fortune.com/2021/09/16... [fortune.com]

    I used to be a big proponent of renewable energy, now not so much anymore. For if we can't produce enough renewable, what then? We can't seem to find enough ways to store enough energy over many days. Meaning we need a backup energy supply and if that is the case, why on earth are we even doing solar and wind?

    • For if we can't produce enough renewable, what then?
      That is a stupid question.

      As answer I cite you:
      As a result the UK had to power up fossil fuels.

      You see? You still have your old fossil plants, you simply can power them up ...

      Wow, that was so simple again.

      Meaning we need a backup energy supply
      You already have one. Should I cite yourself again?

      why on earth are we even doing solar and wind?
      Because it is cheap and plenty?

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