Can solar costs keep shrinking?

Original Article ↗ Hacker News Discussion ↗

Solar photovoltaic costs have plummeted, but commenters argue most of the remaining expense is no longer the panels themselves but labor, permitting, grid integration, land, and financing — especially in places like the US where tariffs and regulation keep installed prices high. They dispute claims that economic growth must track rising energy use, pointing to efficiency gains, service-heavy economies, and decoupling of GDP from energy consumption, while also noting that very cheap clean power would enable new energy‑intensive industries. Many see utility‑scale solar plus storage (batteries, heat pumps, possibly nuclear backup) as the likely backbone of future grids, with rooftop systems playing a niche role and policy choices around tariffs, net metering, and domestic manufacturing heavily shaping how fast the transition proceeds and who benefits.

Energy use, GDP, and the Henry Adams curve

  • Several commenters reject the article’s implied “more energy → more GDP” causality and the idea that falling off the Henry Adams curve is a “catastrophe.”
  • Data cited from World Bank: since ~1970 the US has produced much more GDP per unit of energy, with GDP/energy improving roughly 10x by 2010–2014.
  • Others argue energy still sets a hard floor: there are no rich, energy‑poor countries, and many future activities (desalination, carbon removal, synthetic fuels) would be unlocked by very cheap abundant energy.

Efficiency, decoupling, and Jevons paradox

  • Many examples of efficiency gains: LEDs vs incandescent, EVs vs ICE, heat pumps vs gas furnaces, lighter cans, better industrial processes.
  • Some emphasize decoupling: US GDP kept rising while energy use flattened.
  • Others invoke Jevons paradox: efficiency often expands total energy use by making new applications economical; low‑GDP countries also tend to have low efficiency.

Electrification and total energy demand

  • Debate on whether a fully electrified economy needs more or less total primary energy:
    • One side: EVs and heat pumps mean much less energy than current fossil use (EVs ~3–8x more efficient, heat pumps 2–4x).
    • Another side expects 4–6x more electricity demand as we electrify industry and discover new uses for cheap power, though total energy spend could still fall.

Solar costs, tariffs, and trade

  • Strong agreement that PV module prices have crashed (panels now cheaper than window glass; wholesale in some markets cited at ~€0.07–0.12/W).
  • Multiple comments say in the US, tariffs and trade actions have kept panel prices several‑fold above global levels and slowed deployment.
  • Disagreement on whether Chinese prices reflect “dumping” or just scale and industrial policy.

Utility‑scale vs rooftop; soft costs and labor

  • Consensus that modules are now a minority of system cost; labor, permitting, racking, inverters, marketing, and financing dominate, especially for residential.
  • Several argue utility‑scale ground‑mount should win on cost; rooftops are more about politics, resilience, and personal economics.
  • Others highlight very high US residential quotes versus much cheaper EU or DIY installs, implying large soft‑cost “swindle” in some markets.

Grid integration, pricing, and net metering

  • Discussion of the “duck curve” and saturation of mid‑day solar; net metering at retail is increasingly seen as unsustainable at high penetration.
  • Some regulators find rooftop solar a net grid benefit at low penetration; others highlight cost shifts onto non‑solar customers.
  • Flat connection fees and income‑based charges are controversial; some see them as fair payment for grid services, others as utility rent‑seeking.

Storage and intermittency

  • Rapid growth of grid batteries in California and Texas is cited as evidence that storage is scaling and solving ramping problems.
  • Skeptics argue today’s batteries cover only hours, not multi‑day or seasonal “dunkelflaute,” and that multi‑TWh storage remains far from economical.
  • Alternatives discussed: pumped hydro, thermal storage (sand/molten salt), hydrogen/e‑fuels, demand shifting (EVs, industrial loads, heating).

Nuclear vs solar

  • Some remain strongly pro‑nuclear (for land use, firm power, and long‑term abundance), but others point to repeated cost overruns and nuclear’s much higher LCOE vs solar+storage in current reports.
  • There is debate over whether high nuclear costs are intrinsic (steam‑cycle complexity, safety) or mostly regulatory and political.
  • Several note that in practice new build globally is dominated by PV and wind; nuclear additions are modest and heavily state‑backed.

Policy, regulation, and deployment speed

  • Examples from Germany: high household prices, heavy taxes, large export of cheap surplus solar, political fights over coal, gas, and nuclear phaseout.
  • US issues include interconnection queues, grid upgrade cost allocation, NIMBYism around transmission and wind, and utility influence on rooftop policy.
  • Some see China’s planned, state‑led build‑out of PV and manufacturing as proof that coordinated industrial policy can massively accelerate the transition.

DIY and off‑grid

  • Multiple commenters describe DIY or semi‑DIY systems (homes, RVs) where falling panel and battery prices make off‑grid or heavily grid‑light living feasible.
  • Even so, practical issues (water, winter sun, maintenance, medical access) mean such setups are portrayed as niche lifestyles, not mass solutions.