Snowy Hydro: A Wasteful Project

According to information from the crew working on Snowy Hydro, the reason the Florence tunnel boring machine became jammed while drilling a bend is because it was used for too long between scheduled maintenance. This practice reduces production costs and increases boring rates, however as the cutting wheels wear down, the tunnel is cut to a narrower width. In this case, the machine jammed on a bend where the full width was needed for clearance.

I asked about this at the last Estimates and received a partial admission that the jam was due to worn cutting wheels, but that it was a one-time occurrence. I have requested the maintenance logs for Florence to determine if this was indeed an isolated incident or part of a wider problem.

One Nation believes the Snowy Hydro project is a fool’s errand. While the sunk cost (money spent so far) is around $4 billion, completing the project will cost an additional $20 billion. This does not include the drilling region, which is full of asbestos – a can of worms yet to be addressed.

Another problem is that the electricity from Snowy 2.0 is being sent to Victoria and South Australia via Hume Link, which began construction this week. Hume Link involves putting two high-voltage power lines (two towers) across 360 km of bushland, which will require clearing, as well as farmland and forcibly reclaimed private property. This will cost another $5 billion.

All this expense just to provide firming of unreliable wind and solar power, when a zero emission coal plant could do the same thing for a few billion.

Transcript

Senator ROBERTS: I don’t know if this was asked before, but is Florence moving?

Mr Barnes: Yes.

Senator ROBERTS: How long has she been moving?

Mr Barnes: She has been moving in a more predictable fashion since July and a total length of 1.6 metres and we are now achieving—kilometres. That was true a year ago. We’re now achieving the rates we need to achieve the target date of December ’28.

Senator ROBERTS: How far has it drilled since July?

Mr Barnes: I would have to come back to you on that specific.

Senator ROBERTS: Okay. Can I ask about maintenance on the tunnel boring machines. I understand a cutting head inspection must be performed every mere six to eight metres, stopping every two metres for concrete
behind. Is that a fair statement of the normal operation of a TBM?

Mr Barnes: The way the TBM advances is that it excavates a two-metre length, and the concrete segments that form the tunnel lining are then placed into the—the circumference of the tunnel. And that takes about 40
minutes, typically. So in that 40-minute period someone will inspect the cutter head to make sure that they can then do the next two metres. Periodically, we stop it for longer and do maintenance and replace some parts.

Senator ROBERTS: As I understand it, weekends are normally used for the inspections on the cutter head.

Mr Barnes: Snowy 2.0 is a 24/7 operation, so it happens as it occurs. So if it was a Wednesday evening when we have to do some maintenance, that’s when we would do it.

Senator ROBERTS: How long has it been 24 hours?

Mr Barnes: Since the start of the construction.

Senator ROBERTS: Since the start. Okay. Thank you. Is it true that the cutting wheels were not replaced at the correct time sometime in the last few months and that the tunnel is, as a result, being built to 11.4 metre
width?

Mr Barnes: The tunnel—

Senator ROBERTS: I think the specification is 11.5.

Mr Barnes: I can’t remember the exact figures, but the tunnel boring machine does construct a circumference which is over 11 metres and then there is ground and a concrete segment that brings the interior of the tunnel to just under 10 metres.

Senator ROBERTS: What are the specifications on the drill before you put the lining? Is it 11.5 or 11.4?

Mr Barnes: It’s just over 11, I think is the number.

Senator ROBERTS: Just over 11?

Mr Barnes: We can come back on notice but it is over 11 and then the internal circumference is under 10 because—

Senator ROBERTS: I would have thought they would be very important specs.

Mr Barnes: Well, they are very important specs but I don’t keep every number in my head.

Senator ROBERTS: No, I understand that, but that would be fundamental to the project, wouldn’t it?

Mr Barnes: Yes, they are fundamental and we have an international design joint venture of Tractebel and Lombardi who have signed off on these as specifications that will last 150 years.

Senator ROBERTS: Is there anyone in the room who knows what the designed cutting diameter is? 11.5, 11.4?

Mr Barnes: No.

Senator ROBERTS: No one?

Mr Barnes: No, but we can provide you that information on notice.

Senator ROBERTS: So, as I understand it, the cutting width spec is 11.5 and that because the cutting wheels were not replaced at the correct time, the tunnel as a result is 11.4, which caused Florence to get wedged on a
bend. Is that correct?

Mr Barnes: That’s not because of the design characteristics. There was a period in May when we hit very hard rock as we were going around a bend, and that hard rock wore down the edge cutters quite dramatically. I think that happened—I will get these dates wrong, but it happened on a Thursday. We were public on the Friday with that information, and on the Monday we had a specialist crew on site who used high-spec water blasting to relieve that pressure. Florence has now moved forward and is on the straight so doesn’t have any corners to deal with.

Senator ROBERTS: So for clarity, you are saying that Florence never cut a width of less than 11.5. I just said that the spec was 11.5 and the reason it became stuck on a bend was not because the tunnel was being cut to a lesser width, 11.5, as a result of overextending the life of the cutting wheels to speed up excavation?

Mr Barnes: No.

Senator ROBERTS: Okay. Could you please provide the maintenance log on notice of inspections and replacement of the cutting wheels on Florence for the last two years?

Mr Barnes: Probably. I’m not sure what that would help the minister with—

Senator Ayres: We will take that on notice, if we can, and see whether that is something that we can sensibly provide.

Senator ROBERTS: Swinging quickly to Kurri. What is the completion date of the Kurri gas pipeline? I understand the power station will have to burn diesel until the gas pipeline is connected. Is that correct?

Mr Barnes: The current schedule is for the gas infrastructure to be completed by 10 March.

Senator ROBERTS: 10 March next year. Where is the gas coming from and how secure is your supply over the timeframes of 10 years and 25 years?

Mr Barnes: So we rely on a gas portfolio drawing on the national gas grid. We have a range of contracts. Sometimes we access the wholesale market on the day. We announced earlier this year that we had entered into a gas storage arrangement in western Victoria. So I think the simple answer is that it’s a portfolio approach.

Senator ROBERTS: Who owns the storage facility in Victoria?

Mr Barnes: It is owned by a company called Lochard Energy.

Senator ROBERTS: Above ground energy?

Mr Barnes: It’s underground storage. The Iona Gas Storage Facility, I think is the name of the facility.

Senator ROBERTS: So it’s rock. It is not lined?

Mr Barnes: No, it’s an old geological storage cavern.

Senator ROBERTS: The Newcastle Herald reported on the Albanese government commitment of $7 million on top of the current $950 million construction cost to allow the plant to run on a blend of hydrogen and gas. How far advanced is the hydrogen component at Kurri?

Mr Barnes: We have now had confirmation of Mitsubishi Heavy Industries that with some notification, we can run at 30 per cent hydrogen.

Senator ROBERTS: How far advanced is the hydrogen component of the Kurri plant?

Mr Barnes: We have proven technically with our equipment provider and with some modification, which we have not yet committed to, that would enable us to run 30 per cent hydrogen.

Senator ROBERTS: Any idea of the completion date?

Mr Barnes: We are not currently executing that project.

Senator ROBERTS: So where is the—you are not executing the project on hydrogen?

Mr Barnes: No. We know it is technically capable.

Senator ROBERTS: That’s the end of it for now.

Mr Barnes: For now, yes.

Senator ROBERTS: Where would the gas come from? Mitsubishi?

Mr Barnes: Mitsubishi are the turbine manufacturer. The question of hydrogen supply we haven’t assessed.

Senator ROBERTS: Any idea at all? Because hydrogen is very expensive to produce, as I understand it.

Mr Barnes: Yes. We haven’t assessed that.

Senator ROBERTS: You haven’t assessed the cost?

Mr Barnes: No.

Senator ROBERTS: Okay. Thank you so much, Chair.