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Posts Tagged ‘wind power

our recent power outage – how to prevent a recurrence. part 2

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dispatchable solar energy to local areas - a possible solution

dispatchable solar energy to local areas – a possible solution

Jacinta: So the problem is, or was, that the whole state of South Australia was left without power for a long period of time – more than 24 hours in some places, it varied between regions. This affected some 1.7 million people, endangering lives in some instances.

Canto: And how did it come to be a problem? First because of storm conditions, particularly north of Adelaide, described as unprecedented. This might be seen as the proximate cause, with many describing the ultimate cause as anthropogenic global warming, which will see conditions such as these arising more often.

Jacinta: Well another cause, whether proximate or ultimate, might be degraded transmission infrastructure – the big towers. The transmission network, which is operated and managed by ElectraNet, is the long-distance network, carrying power to the distribution network – the poles and wires – which connects homes and businesses. The distribution network is owned and managed by SA Power Networks, which is 51%  owned by Cheung Kong Infrastructure/Power Assets (CKI), a Hong Kong Chinese company. But it’s ElecraNet that we need to focus on. It’s apparently owned by a consortium of companies, but the largest share is 46.5%, owned by China’s State Grid Corporation (SGCC), the largest electric utility company in the world. I’ve heard rumours that there were complaints by technicians regarding rusty and poorly-maintained towers, complaints dating back over five years, but I’ve found nothing as yet to confirm those rumours.

Canto: So overseas ownership may feature in answering the question of how this came to be a problem. Another factor might be the interconnectors.

Jacinta: Yes, to be clear, there are two interconnectors between SA and Victoria, with some speculation about a third being built connecting us to NSW, and allowing us to export our renewables-based energy to that state from time to time…

Canto: Can you describe what an interconnector actually is, and how it works? I’ve heard that they actually work as surge protectors, among other things, shutting down the system when it’s overloaded or in crisis.

Jacinta: It connects transmission systems between different states, or different countries, allowing states to import or export power according to differential capabilities at different times, which helps stabilise or standardise the power available to interconnected states or regions. I should point out that SA imports far more power than it exports, so we are reliant on the national electricity grid, as we always have been I think, for regular, stable supply. Apparently, in terms of area, this is the largest electricity grid in the world. In 2013-2014 SA’s import to export ratio was 6 to 1.  If you look at the chart on the SA government website, you’ll notice that SA generates less power within its borders than any other state, including Tasmania, which gets most of its power from hydro. But this varies – not long ago, when Tasmanian dams were low, that state was the least productive. The two interconnectors to Victoria are the Heywood interconnector, with a 460MW capacity, and the smaller Murray Link, which was not operational at the time of the storm. An ABC article quotes the SA Premier as saying the interconnector ‘played no role in the blackout’, but the same article quotes Paul Roberts of SA Power Networks: “We believe — and this is only early information — that there may have been some issue with the interconnector but the state’s power system is shut down I think possibly as a protection”. This statement is vague – it tends to contradict the Premier, but it doesn’t say that the interconnector had a direct role in the statewide shut-down.

Canto: Sounds like people are being cagey and defensive right from the start.

Jacinta: Well, of course – avoiding blame here is a big thing, in terms of money as well as reputation. It’s probably being overly naive to assume that nobody really knows whether the shut-down was caused by the interconnector, or whether that shut-down, if caused by the interconnector, was absolutely necessary. But it looks like nobody’s going to admit knowledge.

Canto: So the problem may or may not have been related to the interconnector, but it was definitely caused by a major storm north of Adelaide, which may or may not have been due to anthropogenic global warming, and it caused damage to infrastructure which may or may not have been avoided if that infrastructure was being upgraded effectively by ElectraNet. Sounds like we’re getting nowhere fast.

Jacinta: What about this idea that the state’s relying too much on renewables. What evidence is there about that?

Canto: Well, unsurprisingly, the state’s opposition leaders and their fellow-travellers are lining up to score points out of this event. SA’s conservative party leader Steven Marshall says there should be an investigation into the state’s ‘lack of base-load power generation’, the Prime Minister, Malcolm Turnbull, who now heads a conservative government in spite of having been a long-time advocate of renewables, has ‘rebuked’ state labor governments for having ‘ideological’ renewable energy targets, and the populist MP Nick Xenophon has expressed a rather vague but passionate outrage.

Jacinta: Okay so let’s look first at SA’s lack of base-load power generation. Hasn’t this been a perennial problem for SA? As I’ve already said, we’ve been importing a lot of power from interstate, on a variable basis, really since the year dot. Or since we’ve been able to do so, via the interconnectors.

Canto: Well there’s something of a new mantra among the renewable advocates that the base-load concept is out-dated, but I’d rather not get into that now, I’m really a novice about electricity markets and grids and such. The fact is that SA is running neck-and-neck with Tasmania as the state that produces the least electricity in the nation, though of course SA is a much bigger state. It’s just that now we’re generating more from wind, so we’ve shut off our coal generators. So the argument will be that renewables had nothing to do with the outage, which damaged transmission lines and initiated a shut-down of our only operating interconnector. This would’ve happened regardless of the power source, though there may be questions about the interconnector, and about the maintenance of the transmission lines.

Jacinta: Okay, that’ll do, though I’d like us to discuss the whole topic of renewable energy, in SA and elsewhere, on an ongoing basis in the future. It’s a hot topic, with a lot of people implacably opposed to it, particularly readers of the rather reactionary Australian newspaper, apparently. All very amusing. And perhaps we can educate ourselves a bit more about the National Electricity Market (NEM), the Australian Energy Market Operator (AEMO) and the future of grids and off-grid electricity supply.

For more interesting articles on this issue:

http://www.smh.com.au/business/energy/sa-power-outage-caused-by-cascading-series-of-events-20161004-grv29c.html

http://www.adelaidenow.com.au/news/opinion/sam-johnson-solar-power-must-be-provided-to-regional-centres-such-as-port-augusta-to-provide-electricity-security/news-story/4ffcdfeb9fc35ef3f8cbfe0eea1c9bdc

http://www.abc.net.au/news/2016-10-06/appalling-management-to-blame-for-prolonged-black-out-in-sa/7908032

 

Written by stewart henderson

October 15, 2016 at 5:15 pm

the renewable energy juggernaut

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new-england-solar-wind-becoming-cheaper-than-fossil

There is more global investment in solar power today than there is in fossil fuels. We’re talking about hard-headed investment for profit by business and governments worldwide, not greenies or special interest groups. And another interesting factoid: China today is generating more energy from wind power than the whole of Australia’s energy production. Not to mention the Chinese government’s massive investment in other renewables. That’s info I got from a recent ABC Science Show podcast. Renewable energy really is making inroads, and this is most encouraging for those around the world fighting the damaging environmental effects of mining and fracking in their regions, though it’s clear that such operations are dying hard.

I remember some time ago at a meeting of skeptics (not climate change ‘skeptics’, just regular sciencey anti-quackery, anti-UFO-type skeptics), when I was spruiking the virtues of wind power, so successfully taken up here in South Australia, being told dismissively that it was too expensive to be really viable. However, wind-power only really has establishment costs. Ongoing costs are quite minimal. Furthermore, a research group conducted by the Carnegie Institution for Science’s Global Ecology Department has recently conducted the most wide-ranging expert survey on wind (or any other) energy. Sure, it was a survey of those already heavily invested in wind, but that does make them the experts in the field. Predictions about the cost of wind energy into the future were based on two approachess. First, a projection into the future of falling costs over the past three decades or so – what they call the ‘learning curve’. One would assume those projections would vary from ‘most optimistic’ to ‘most pessimistic’, with consensus somewhere in between. The second approach involved a ‘bottom-up engineering assessment’, looking at the costs of individual turbine components into the future. Science Daily has summarised the findings:

On average, the participants expected wind power costs to continue falling for the next several decades, for three major classes of wind turbines, both onshore and offshore, with prices falling by 24-30% by 2030, and 35-41% by 2050.

Meanwhile governments worldwide are getting on board in a determined effort to drive down the cost of solar. Vox Energy & Environment reports on the US target:

…the US Department of Energy has a program, the SunShot Initiative, devoted entirely to driving down the cost of electricity generated by solar panels — the target is solar power with $1 per watt installed costs by 2020, a 75 percent reduction in costs from 2010.

It’s hard to get the head around the growth of solar energy worldwide since about 2007. It’s been a whirlwind ride, but starting from an extremely low level. And in the US since 2012, large or utility-scale solar has been growing faster than domestic, rooftop solar, and with falling prices and increasing module efficiency, the growth trend in big and small solar should continue well into the future. Yes, there’s government stimulus, but solar is being seen more and more as a sound investment on its own terms. Solar’s steady growth also makes for sound investment against the high volatility of the natural gas market. And this of course is just as relevant for many regions outside the US.

I’ll be taking another look at Australia’s situation, while many of our governments bicker and focus elsewhere, in an upcoming post.

global_wind_power_cumulative_capacity

Written by stewart henderson

September 16, 2016 at 8:57 am