Nuclear energy is more expensive than renewables, report finds
Australia’s latest GenCost report finds that new solar and wind, even after adding storage and grid “integration” costs, are projected to remain cheaper than new nuclear plants, especially small modular reactors. Commenters debate whether such comparisons adequately account for long-duration storage, seasonal fluctuations, and backup needs, with some arguing that renewables plus gas (or future fuels) are the most economical path and others insisting that nuclear is still needed for low‑carbon baseload. The exchange also touches on subsidies, waste management, regulatory burdens, and whether battery and pumped‑hydro build‑outs can realistically replace fossil peaker plants.
Scope of the Report and Australia-Specific Context
- Report compares new-build costs in Australia; several commenters stress results may not generalize to other countries.
- Australia has no existing nuclear industry but abundant cheap land, sun, and wind, which favors renewables.
- Nuclear would require building full fuel-cycle and regulatory capability from scratch, raising capital costs.
Cost Comparisons: Renewables vs Nuclear vs Gas
- Thread highlights that the report includes “integration costs” for high renewable shares (storage, transmission) and still finds them cheapest.
- Some argue comparisons should model 100% reliable solar+storage vs nuclear on an equivalent capacity basis; others say 100% renewables may be unrealistic or still need gas support.
- Gas is seen as the short- to medium-term “backup” for renewables; some say ignoring CO₂ cleanup makes gas look artificially cheap.
Storage, Intermittency, and Grid Reliability
- Major debate over how much storage is needed: hours (duck curve), days, or weeks/seasonal deficits.
- Many note current battery deployments (e.g., California, Australia) are scaling fast for intra-day storage and replacing peaker plants.
- Skeptics emphasize the huge TWh-scale storage needed for full decarbonization, arguing current and projected battery production is far too small.
- Alternatives discussed: pumped hydro (geographically limited but potentially large-scale), gravity storage, thermal storage, hydrogen/e-fuels; several point out these are early-stage or location constrained.
Nuclear Economics, Regulation, and Waste
- Consensus: operating costs for existing nuclear are low; new-build capital costs are very high.
- Some blame “ridiculous regulation”; others argue nuclear has historically required massive subsidies and socialized risk.
- Waste: supporters stress its small volume and long-term burial; critics highlight unresolved long-term storage, past mismanagement, and very long half-lives.
- Small modular reactors are noted as particularly expensive in the Australian context.
System Design: Optimal Mix vs Either/Or
- Multiple commenters say “solar vs nuclear” is the wrong frame; the real question is mix and timing as demand electrifies (EVs, heating, industry).
- Demand response, smart grids, and flexible loads (e.g., EV charging, industry) are proposed to complement variable renewables.
- Some argue nuclear will be priced out in a future of cheap, abundant renewables; others insist firm low-carbon baseload is still essential.