The World Nuclear Industry Status Report 2026 documents a milestone that has been approaching for years but arrived faster than most projections anticipated: global monthly solar generation surpassed nuclear output for the first time in April 2025. Wind had already crossed that threshold a month earlier. From March 2025 through June 2026, either solar or wind individually outproduced nuclear every single month. The capacity numbers tell the structural story. Solar added 510 GW in 2025 alone, reaching 2,383 GW globally — a 27% year-on-year increase. Wind added a record 159 GW to reach 1,291 GW. Nuclear's installed capacity rose by 1.5 GW to 399.5 GW, while its operating capacity actually declined by 0.5 GW. Even these solar figures may undercount reality: IEA PVPS data suggest 2025 PV additions were closer to 690 GW, roughly 180 GW more than the WNISR estimate. Nuclear's share of global electricity fell to 8.8% in 2025, its lowest level in over four decades and roughly half its 1996 peak of 17.5%. Output grew 1.1% year-on-year, but that was entirely a China story — Chinese nuclear generation jumped 7.6% while output outside China declined 0.2% and remained below its 2006 level. Between 2006 and 2025, 104 reactors started up and 106 closed. Strip out China's 53 startups and zero closures, and the rest of the world lost a net 55 reactors. The construction pipeline tells a similar tale of geographic concentration. Of 73 reactors under construction as of July 2026 — the highest count since 1987 — China accounts for 37. Russian technology is involved in 29 units, including 22 outside Russia. Of 52 construction starts worldwide between 2020 and 2025, all but one involved Chinese or Russian nuclear industries. None of the 16 reactors connected to the grid between 2023 and 2025 was completed on schedule, with an average construction period of 10.9 years. Small modular reactors, long positioned as nuclear's modernization pathway, have yet to deliver commercially. The report notes that many proposed SMR designs exceed 300 MW, that some designs may generate two to 30 times more waste than conventional reactors, and that modular manufacturing economies require a large predictable market that does not yet exist. The UK has committed £2.6 billion ($3.5 billion) to advance three Rolls-Royce units at Wylfa, with a final investment decision not expected until 2029. US federal funding supports several projects, but most remain years from operation. Battery storage is reinforcing solar's structural advantage. Grid-scale deployment hit 104 GW and 257 GWh connected in 2025 alone, with more than 78% of all cumulative battery capacity installed between 2023 and 2025. Falling battery costs are directly addressing the intermittency argument that nuclear advocates have traditionally used against variable renewables. The financial signals are consistent with the physical ones. Holtec pulled its IPO days before listing. Fermi has lost roughly 80% of its stock value since its October 2025 debut. As WNISR author Mycle Schneider put it: these companies have little to show on the ground to convince investors to keep providing cash. The market is not confused about which energy technology is scaling.
