The Real Cost
A$173bnand ~20 million tonnes of material have gone into the renewable build. Here is what that could have bought instead — and the bills the headline figure doesn't capture. Every number is sourced and the honest caveats are shown, because a number that can be knocked down is worthless.
1 · The nuclear counterfactual
The honest catch — lead time, not cost, is the real problem. At a realistic Australian first-of-a-kind cost (~A$10–16bn/GW overnight), A$173bn buys ~11–17 GW of nuclear — delivering ~80–150 TWh/yr at 90% capacity factor (around today's entire renewable output), from plants that run 60 years. But it would arrive from ~2040 at the earliest. Overnight cost only (excludes interest-during-construction, grid, decommissioning). You cannot honestly quote Korea/China fleet prices for a zero-base build. The strongest counterfactual isn't the dollar figure (CSIRO assumes a 120% first-of-a-kind premium and a ~59% load-following capacity factor, which would cut delivered TWh ~35%) — it's that the first reactor couldn't deliver power before ~2040, 15+ years after the ban is lifted. Sources: CSIRO GenCost 2024-25, IAEA, World Nuclear Association, Lazard.
2 · The bill the nameplate doesn't pay
Stated honestly: Variable renewables don't inherently supply firm capacity: ~53 GW of installed wind+solar counts for only ~5–21% of nameplate at the coincident peak (~35 GW) — solar's credit falls toward ~5% at saturation, wind ~11–21% (NREL ELCC). So AEMO's plan (2024 ISP, Step Change scenario) builds a SEPARATE ~74 GW dispatchable fleet by 2050 — ~4× today — that must be built and paid for on top. Honest: that gap can be filled by storage, hydro, gas OR nuclear — it is not 'the same fossil fuels' — but it is an unavoidable ADDITIONAL system cost the headline figures don't capture. Sources: AEMO 2024 ISP (Step Change), NEM reliability standard, NREL ELCC, CSIRO GenCost integration costs.
3 · Lifecycle carbon — both scenarios
Both grids beat coal/gas (~600–820 g/kWh) — conceded openly. The honest catch: the rosy ~40 g/kWh headline already includes the whole supply chain (you can't add mining/refining/transport on top — that double-counts), but it's a best case — clean-grid manufacture, one lifecycle, no firming. Australia's REAL case — China-coal-made panels plus gas firming — lands realistically around ~65 g/kWh (and up to ~145 if gas-heavy): several times the headline, well above nuclear's ~15–25, though still below gas. And because the fleet is rebuilt 2–3× over a reactor's life, its TOTAL emissions keep accruing. The gap is driven by firming choice + manufacturing location — not any inherent renewable virtue. Mt-CO₂ totals are illustrative; the ratio and drivers are the robust takeaway. Sources: IPCC AR5 Annex III, UNECE 2021/22 lifecycle, CSIRO GenCost, Fraunhofer ISE, Argonne.
4 · Waste — two axes, both shown
Two axes. By MASS: renewable end-of-life waste outweighs nuclear spent fuel by ~2–3 orders of magnitude — millions of tonnes of PV glass/aluminium by 2050, <15% recycled, mostly landfilled. By HAZARD: nuclear spent fuel is intensely radioactive and long-lived but tiny (~60kt over a 60-yr fleet), fully inventoried and engineered-for. Both end-states are unfinished — no deep geological repository operates yet; most panels and blades are landfilled. Sources: IRENA End-of-Life PV, Salim et al. 2023 (AU PV waste), DCCEEW, World Nuclear Association.