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Politics is a factor definitely but there are some technical issues of relevance.looking for quick info from someone knowledgable about QLD electricity - looking for technical/finance understanding here (not political answers, not interested in getting into that)
Simple answer is that in any power system there are two fundamental constraints and approaching those limits is the normal reason for building a new power station unless it's simply to replace something that's worn out.
1. Peak generating capacity. You need enough generation to always meet actual demand, which varies considerably, in real time and with some to spare (because breakdowns do happen).
2. An adequate source of energy (fuel) with which to run the generating capacity.
Wind and solar PV address point 2 very effectively but they're not of themselves effective at addressing point 1 beyond a very limited extent.
Pumped hydro and batteries both address point 1 effectively but are a net negative so far as point 2 is concerned. To run the generating capacity you first need to have drawn energy from the grid and there will be losses in that.
In the Queensland context there are two modest size conventional hydro schemes of any significance (so excluding really small ones) in operation and one medium sized pump storage scheme which is separate.
Numerous sites exist to build pumped storage so no constraints there.
There are sites where conventional hydro could be developed but it's a limited resource when compared to Tasmania or southern NSW but it's not zero. So it's not a major option within Qld but there are some possibilities, use of which would reduce the need for other methods but couldn't eliminate them.
There's huge hydro resources in PNG however and no technical reason why it couldn't be supplied to Qld. Origin Energy was interested in this idea some years ago, they were proposing 1200 MW as the initial stage. The complexity of course is that it's in a foreign country.
Biomass is also a limited resource and already quite a bit of that is used to the extent that it's available, primarily as a by-product of agriculture. Could do a bit more maybe but not a lot.
For the rest:
Coal - plenty of that and it addresses both points 1 and 2.
Nuclear - having the fuel nearby is neither an advantage nor a disadvantage due to its incredibly high energy density and it addresses both points 1 and 2. Damn expensive though and virtually impossible politically.
Gas - plenty of it as such but there's a lot of issues surrounding it.
I don't have a link to it but there's at least one decent study forecasting Qld gas production to peak in the mid-2020's and after that it's all downhill. I'm no geologist so no comment on how valid that is but ultimately gas is a finite resource and a fairly limited one when compared to coal.
Add to that declining production in SA (a well established trend) and expected steep declines in Victoria during the 2020's (which are starting now and acknowledged by the relevant companies) and there's the great gas squeeze. (There's no gas production in Tas and nothing of significance in NSW / ACT).
To cut a long story short - if you want gas then either cut a deal with the LNG exporters in Qld or you could ship the stiff in from overseas as AGL, Australian Industrial Energy, BHP / Esso and Venice Energy all plan on doing via separate LNG import terminals to be built in SA, Vic (two) and NSW.
FWIW there's already significant gas-fired generation which is operated infrequently due to the above and some of that is in Qld.
Oil - Dead easy to ship the stuff in from overseas but the ongoing cost of doing so will send whoever does it broke almost certainly. Technically sound but it's an expensive way to generate electricity these days.
Put all that together and realistically the options in Qld are:
Coal. Works but it's contentious.
Wind + Solar + Pumped Hydro. Works as long as everything's properly sized but is unforgiving of shortcuts.
Gas only if someone can source the stuff at a sensible price.
Hydro from PNG.
On a small scale there's some hydro and a bit of biomass.
I've left nuclear out for the pragmatic reason that the chance of it actually happening seems incredibly low.
My opinion is that given all the wind and solar already either built or committed in Queensland, plus having a relatively young fleet in terms of existing coal-fired generation, then if they need more peak capacity well then pumped hydro is an obvious answer there. Up to a point batteries also have a role.