In a First, Solar Was Europe's Biggest Source of Power Last Month
Solar power briefly became the largest source of electricity in the EU in June, supplying around 22% of the bloc’s grid demand and highlighting how fast renewables are scaling relative to fossil fuels and nuclear. Commenters contrast Europe’s progress with lower solar shares in the US and China, and dig into the technical and economic challenges of intermittency, storage, transmission capacity, and seasonal variation. The debate centers on whether overbuilt solar and batteries, complemented by wind and limited gas, can reliably replace fossil fuels, or whether more nuclear is still needed despite its higher costs and long build times.
Solar milestone and regional comparisons
- Discussion centers on solar supplying 22% of EU electricity in June, making it the largest grid source that month.
- Commenters note seasonal cherry‑picking (June vs winter), but still see it as an important inflection point.
- EU is ahead of China and the US by share of electricity from solar, but China produces far more solar energy in TWh.
- Some stress that “power” here really means “grid electricity”, not total energy (heating, transport, industrial fuels).
Intermittency, seasons, and storage
- Strong agreement that summer solar output can be abundant even in “non‑sunny” regions; winter remains hard, especially in northern/overcast climates (e.g. UK roof‑top experience).
- Solutions discussed: overbuilding solar, large grids with transmission, complementarity with wind and hydro, pumped storage, chemical “power‑to‑gas”, and demand shifting (EVs, heat pumps, flexible loads).
- Debate on how much storage is needed: some cite ~30 TWh to 100 TWh globally; others argue this is technically and economically feasible as battery prices and capacity scale rapidly.
- Dunkelflaute (prolonged low sun + wind) is raised; some say existing gas plants can cheaply cover the last few percent, others insist long‑duration storage or firm generation is still a major cost/risk.
Nuclear vs. solar/wind + storage
- Very long, heated debate over whether nuclear should be scaled alongside renewables.
- Pro‑nuclear side: renewables and batteries alone may be too expensive/risky at very high penetration; modest nuclear share (≈10% of energy) could cut storage and overbuild needs and improve system resilience.
- Anti‑nuclear side: new Western nuclear is portrayed as 5–10× more expensive, too slow to build, with negative learning curves and hidden costs (waste, insurance). They argue solar/wind + diverse storage (batteries, pumped hydro, power‑to‑gas) is already cheaper and faster.
- No consensus; multiple participants explicitly call the total‑system cost impact of small nuclear shares and large‑scale storage “unclear”.
Geopolitics, industry, and independence
- Several comments link Europe’s push for renewables to lack of domestic fossil fuels and the Ukraine war; reducing dependence on Russian gas and imported hydrocarbons is seen as strategic.
- Others argue Europe historically leveraged imported fuels to export high‑value manufacturing and services; losing cheap energy is contributing to deindustrialization and high prices, especially in Germany.
- Disagreement over whether Europe has “no energy resources” vs. sizable but politically constrained fossil reserves.
Grid stability, infrastructure, and lifecycle
- Spain’s blackout is discussed: not caused intrinsically by renewables, but by control/protection settings, inverter behavior, and weak grid management; leads to calls for grid‑forming inverters, more inertia services, and smarter networks.
- Transmission build‑out delays are identified as a current bottleneck, sometimes forcing solar to remain local.
- Waste: concerns about end‑of‑life panels and blades vs. arguments that recycling is improving and site cleanup is straightforward; parallel worries about nuclear waste and accident liability.