Germany hits 80 GW milestone

Original Article ↗ Hacker News Discussion ↗

Germany’s milestone of 80 GW installed solar capacity prompts broad debate over how effectively renewables are decarbonizing its power sector, given continued reliance on coal and gas and high consumer electricity prices. Commenters contrast Germany’s wind- and solar-heavy “Energiewende” with nuclear-heavy systems like France’s, arguing over cost overruns, construction timelines, safety, and whether shutting down nuclear plants was a strategic error. The exchange also explores grid stability, the need for backup capacity and large-scale storage (batteries vs. hydrogen), and how cross-border interconnections and market design shape who ultimately pays for Europe’s energy transition.

Germany’s Capacity Milestones and Energy Mix

  • Germany has reached 80 GW of installed PV, adding ~14 GW in 2023.
  • Thread notes difference between capacity (GW) and production (GWh); Germany reportedly generates ~2.5× more energy from wind than solar.
  • Total installed generation capacity rose from 121 GW (2000) to 218 GW (2019), while actual generation rose only ~5%, highlighting overcapacity needed for weather-dependent renewables.
  • Annual electricity demand is 500 TWh (57 GW average), with peak load cited around 60–80 GW; 80 GW PV is therefore near peak demand but far from covering annual energy needs.

Coal, Gas, Imports/Exports, and Prices

  • One side claims renewables mostly add on top of fossil capacity and Germany still burns as much fossil fuel as 20 years ago, plus has very high retail prices.
  • Others counter with data: coal and lignite generation have fallen substantially since 1990; CO₂/kWh is said to be down ~350 g in 30 years, and 2023 coal use is near multi‑decade lows.
  • Germany has been a net electricity exporter since 2003 (with recent years helping France during nuclear outages), but some exports are coal‑based.
  • Retail bills are driven heavily by taxes, levies, and grid fees; wholesale power can be very cheap (or negative) in high-wind periods, but end users rarely see those prices.
  • Sweden and other neighbors complain that German policy and weather-driven pricing raise regional electricity costs.

Nuclear vs. Renewables

  • Strong split:
    • Pro‑nuclear side: nuclear is reliable baseload, very low‑carbon, and overall among the safest sources; shutting paid‑off plants while burning coal/gas is called irrational and politically driven. They cite historical French build‑out (~20 years) and argue average construction times are ~7.5 years globally.
    • Anti‑nuclear side: new plants are economically unviable in the West (Hinkley Point C, EPR delays, Westinghouse, NuScale), plagued by overruns, decommissioning and waste issues, and proliferation risks. They see nuclear’s global share as stagnating or declining and argue policy and public acceptance make large expansion unrealistic.
  • There is dispute over whether nuclear outages (e.g., in France) were routine maintenance vs. systemic reliability problems.
  • Several argue that Germany’s reliance on Russian gas as backup for wind/solar was a strategic mistake; others say cheap gas made economic sense at the time but ignored geopolitical and climate risks.

Storage, Flexibility, and “What Replaces Fossils”

  • Consensus that high-renewable systems need backup: options discussed include demand shaping, battery storage, gas peakers (potentially hydrogen‑ready), and interconnection via the European grid.
  • One view: nuclear is ill‑suited as flexible backup because it must run near full power for economics; therefore the future is “renewables + storage + flexible demand + gas peakers.”
  • Counter‑view: relying on large amounts of gas (including LNG) undermines decarbonization and security; nuclear plus some renewables would be simpler and cleaner than massive storage build‑out.
  • Hydrogen:
    • Critics say power-to-hydrogen-to-power is far less efficient and cost‑effective than batteries, and warn of gas‑industry greenwashing.
    • Supporters see hydrogen as essential for large-scale, seasonal storage and for hard‑to‑electrify industrial uses, leveraging existing gas storage caverns and pipelines, despite low round‑trip efficiency.

International Comparisons and Variability

  • Germany’s solar resource is poorer than almost anywhere in the continental US; commenters infer the US (especially New England, Midwest, Sunbelt) has much easier technical potential for PV.
  • Florida is discussed as an underperformer given its sun: explanations include regulatory barriers (e.g., insurance requirements for net-metered rooftop solar), hurricanes, and land-use constraints; others note Florida is now rapidly adding utility‑scale solar.
  • The central US (Iowa, Texas and others) already has large wind fleets; Texas in particular is cited as proof that renewables can expand rapidly even in politically conservative, fossil‑friendly regions because they are economically attractive.
  • Some point to Portugal and pumped hydro + interconnectors as a template for high-renewables systems, and to California’s rapid build‑out of grid batteries as evidence storage is scaling.