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As a real, practical example, there's an existing hydro scheme on mainland Australia which has the basic problem that (1) inflow is primarily from snow melt and (2) storage is only 31% of annual inflows. Put the two together and that results in high output during spring, very limited operation the rest of the year.I was going to mention the Lake Pedder/ Franklin Dam/ mining the Barrier Reef proposals that were so wrong and so dangerous but still strongly supported by "the usual suspects". Glad you highlighted those.
Historically that hasn't really mattered but going forward, the real issue is that of VRE (Variable Renewable Energy - wind and solar) "droughts". That is periods of typically 5 - 10 consecutive days of low yields. Those aren't hypothetical, since real world operational data shows there's been at least one every year for as long as we've had wind and solar generation and BOM (and other) data going back much further also shows it's a very real issue.
Now if we take that hydro scheme, well if the storage volume were increased then it becomes just perfect to fill those VRE droughts. Leave the hydro there filling up, run it heavily when the need arises drawing on that stored water.
And it just so happens that there is in fact a way to increase storage from the present 31% of annual inflow to 247%. Doing that provides absolute flexibility in when the water is used, allowing it to be concentrated into the period of VRE droughts, and it also provides a pretty decent drought reserve too.
Now that isn't hypothetical, since the required dam was designed over a century ago just never built, instead only a weir being at the site to divert the river into the pipelines and ultimately through to the much smaller other storage that was built. But the road's there, the pipeline's there, the power stations are there, it just needs that dam added.
In practice though it's not being proposed simply because all hell would break loose if anyone tried building it. Not because there's been some proper ecological study into it, but simply because it's a ~50m high dam on a river in a presently natural area. Burning gas or diesel is, politically, a path of far less resistance even though any engineer or climate scientist will be quick to point out the downsides of doing so.
Now my argument isn't for or against building that dam per se. Rather, it's saying that a proper scientific process should be the basis of making the decision, it shouldn't be political.
Conduct a proper ecological assessment without a pre-determined outcome, do it properly.
If it turns out that there's a unique species living there or something like that, well losing that is one hell of a price to pay in order to generate electricity. Lose too many species and ecological collapse is where it ends up.
On the other hand, if it turns out that actually there's no such issue with species loss and all we're losing is some generic land that becomes a lake, and which could ultimately be restored at some future time if it becomes obsolete, well one would have to be pretty unconcerned about the issues surrounding fossil fuels to rank saving that land as more important.
That's where I diverge strongly with the activists. They tend to take a firm "no" view that says no, you can't put that land under water, you can't put a wind farm somewhere else, you can't run a transmission line here and so on. Trouble is, the practical implication to all those no's becomes "yes, we will burn lots of fossil fuel" as the alternative.
So my argument isn't for hydro over gas or diesel but rather, it's for science over politics along with an acceptance that the scale of what's required is very much in the category of saying we're going to have to break eggs to make the omelette. If the aim's to stop using fossil fuels then it's not going to happen without being willing to sacrifice some scenic views, some generic land and so on. Harsh but true, that's the reality of the situation.
It's much like investing. You can't make a profit if you're not willing to accept losses along with it. Do nothing, because you're terrified of loss, and ultimately you lose the whole lot to inflation (or in this case climate change and running out of gas).
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