California regulators vote to keep Diablo Canyon nuclear plant open 5 more years

Original Article ↗ Hacker News Discussion ↗

California’s decision to keep the Diablo Canyon nuclear plant operating for five more years is framed as a trade-off between immediate climate goals, safety concerns, and cost. Many see extending the life of the existing 2.2 GW facility as essential to avoid increased natural gas use and to maintain baseload power while renewables and storage scale up. Critics argue the projected $6 billion cost would be better invested directly in solar and batteries, countering that modern renewables are cheaper, faster to deploy, and more suitable for California’s conditions than new or aging nuclear plants.

Overall reaction to keeping Diablo Canyon open

  • Many see the extension as positive for CO₂ reduction and grid reliability, given California’s heavy natural gas use.
  • Others view it as a stopgap that delays necessary investment in renewables and storage.

Safety, siting, and trust

  • Repeated concern that the plant sits near fault lines and on the coast, raising earthquake/tsunami and Fukushima-style worries.
  • Some argue modern trip systems and design margins make quake risk manageable; others say failures (like Fukushima) show low‑probability risks can still be catastrophic.
  • Regulatory capture is a recurring theme: skepticism toward PG&E and the state regulator’s independence, even among those who still favor keeping the plant open.

Old plant vs new nuclear

  • Debate over age: critics note construction started in the late 1960s and argue we should replace “old-timer” plants with modern designs.
  • Supporters say many old plants operate safely and cheaply; age alone doesn’t imply risk if maintenance and upgrades are done.
  • Broader worry that public resistance blocks new, safer reactors, leaving society stuck with older units.

Nuclear vs solar/wind in California

  • One camp says California’s sun, wind, and land make new nuclear unnecessary; focus should be on large-scale PV plus storage.
  • Others stress nuclear’s high capacity factor (~90% vs ~30% for CA solar) and baseload role, especially for night loads and future EV charging.
  • Suggestion from several commenters: do both—keep nuclear for baseload and aggressively expand renewables.

Economics of the 5‑year, $6B extension

  • Critics call $6B/5 years “highway robbery,” claiming the same money could buy several GW of solar and multi‑GWh of batteries lasting 20–40 years.
  • Counterarguments:
    • Diablo Canyon already exists and runs today, including at night.
    • Back-of-envelope math in the thread puts the extension at roughly $0.07–$0.08/kWh, which some see as competitive with current wholesale prices.
    • Building equivalent solar+storage is constrained by permitting, interconnection backlogs, and realistic build timelines.

Regulation, project risk, and future tech

  • Some blame nuclear’s cost problems on regulatory burden; others point to management failures, construction gigantism, and labor productivity.
  • Small modular reactors (SMRs) divide opinion: some see scale and factory production as a path to lower costs; others note SMRs have repeatedly failed economically in the past.
  • There is concern that decisions like this extension do little to rebuild a viable, scalable nuclear construction ecosystem in the U.S.