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They’re not much use without a lot of cabling. | Image by Norbert Pietsch from Pixabay
By Jo Nova
Thanks to Oldbrew at Tallblokes Talkshop
Who knew high voltage cables running for kilometers in a deep electrolytic moving body of water would be expensive?
The 245kV Wolfe Island Cable | Photo by Z22
Despite offshore windfarms dealing in a kind of mechanical hell of high speed salt water spray, big waves and volatile wind conditions, surprisingly 85% of the insurance claims are because the underwater cables are failing.* If the subsea cables can’t be insured, it’s another unexpected cost threatening the economics of offshore wind.
The underwater cables needed for offshore wind are apparently so costly to repair, and the losses from lack of generation so steep, they are in danger of becoming uninsurable.
Subsea cable failures pose global threat to offshore wind
Energy News Live
The race to harness offshore wind energy has hit a significant roadblock, with the reliability of subsea cables emerging as a critical concern.
Global Underwater Hub (GUH) has raised alarm bells about the escalating issue of subsea cable failures.
October 6th, 2023 | Tags: Basslink, Subsea Cables, Wind Power | Category: Global Warming, Grids, Renewable, Wind Power |  Print This Post | |
The Basslink cable has gone down again, and is expected to be out of action til mid-October. Luckily for Tasmania, the dams are at 45% full. However in Victoria, which sits on one of the largest brown coal reserves in the world, currently prices are hitting $300/MWh every morning and every evening at peak time. This graph below shows 5 minute prices for the last two days in Victoria. Every dollar Victoria saves at lunchtime from solar generation is lost a few hours later, and then some. Though it’s wrong to use the word “saves” at any time of day. The wholesale price of brown coal power for years was $30/MWh, and this below is a wholesale price graph. Even the lunchtime “low prices” are twice as expensive as brown coal which can supply all day, every day and for hundreds of years to come and doesn’t cause voltage surges, frequency instability, or house fires, and doesn’t need backup batteries, demand management schemes, free movie tickets, or dark hospitals.
The AEMO must be counting their lucky stars that this happened at probably the “best” time of year when demand is lower.
….
The effect of the Basslink outage […]
When cheap solar is expensive Badly installed solar PV makes Australia’s grid fragile
On August 25 last year there was nearly a system blackout when, improbably, three states of Australia were islanded by one lightning strike. Within seconds, trips were switching, two smelters were load shed to save the grid from collapse, and across the Eastern Seaboard of Australia frequency and voltages surged or fell everywhere. In Sydney 45,000 homes lost power for a couple of hours. Shops had to close. Trains were stopped. Passengers were stranded. Traffic signals were not working on major roads. There was chaos. Industrial users shut down in a mass of 725MW of load shedding.
The AEMO final report on that day has just come out and shows us just how fragile our grid is. This was not so much a freak accident, as an accident waiting to happen.
It turns out that another cost of cheap rushed solar panels is that many drop out with voltage spikes, suddenly going offline and leaving another hole to fill. The numbers are amazing — of panels installed in the last 2 years as many as one-third in South Australia dropped out when we needed them and […]
The fear is palpable
How much fun can you have living in a global experiment? In Australia, peak summer is about to hit in a post-Hazelwood-electricity-grid. There’s a suite of committee reports as summer ramps up. Everyday there’s another Grid story in the press, and a major effort going on to avoid a meltdown. Minister Josh Frydenberg announced today that “we’ve done everything possible to prevent mass blackouts”. Or as he calls it, a repeat of the South Australian Horror Show. Politicians are so afraid of another SA-style-system-black that they are throwing money: The “Snowy Hydro Battery” will be another $2 billion. Whatever. It’s other people’s money.
This is what they are afraid of:
The red bars mean “Reserve Shortfall”. The dark blue matter is “Generation”. The graph covers two years (sorry about the quality) so the two red bursts are summer 2018 and summer 2019.
SA Medium Term Forecast, Outlook, AEMO, Nov 16th 2017, South Australia.
Oddly we are headed for a critical time, but this’s the most recent graph I can find — thanks to Wattclarity — from November 16th, 2017. (Here’s an earlier version from March 2017. and from Dec 2016). Perhaps there is a newer […]
Greedy Green Hubris gone wrong? It took months of bad choices to achieve this Gold-Star Moment in Bad Management:
Tasmania’s state-owned Hydro-electric power generator could face legal action for damages after admitting it cloud-seeded in or near water catchments the day before disastrous flooding, although heavy rain was forecast.
Tasmania shut their only fossil fuel power plant in August last year, and relied on renewable energy and one sole Basslink electricity cable to mainland Australia. The cable was supposed to be a back up supply but was bringing in 40% of Tasmania’s electricity, and it broke in December. But a green and greedy approach in Tasmania meant that the state had already run its dams down to 26% levels by selling too much electricity to the mainland at high “renewable” subsidized prices. That was a low level at the start of summer, normally a drier season in Tasmania. After the Basslink cable broke, the dam levels fell to a precipitous 13%, so fast that the green state had to bring in diesel generators just to keep the lights on. They also switched back on the Tamar Gas plant in late January. So much for being the “100% […]
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JoNova A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).
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