Global Solar Power Generation Surpasses Nuclear Output for the First Time
Paris, Monday, 19 October 2026.
According to the World Nuclear Industry Status Report 2026, global solar electricity generation surpassed nuclear power output for the first time in 2025. Between March 2025 and June 2026, solar or wind individually generated more electricity monthly than nuclear. This shift highlights a 27% surge in solar capacity alongside flatlining nuclear growth.
Capacity Expansion and Generation Metrics
The divergence between renewable and nuclear capacity became statistically evident in 2025, when global solar capacity reached 2,383 GW, representing a 27% increase year-over-year [1][4]. In contrast, installed nuclear capacity rose by only 1.5 GW to reach 399.5 GW, continuing a 25-year plateau in growth [2][5]. The ratio of solar to nuclear capacity now stands at approximately 5.965 to one, highlighting the scale of infrastructure deployment favoring photovoltaics [1][2]. Monthly generation data confirms this trend, with solar or wind individually outproducing nuclear every month from March 2025 through June 2026 [3][4].
Construction Timelines and Delays
Nuclear power development continues to face significant temporal hurdles, with an average construction period of 10.9 years for reactors connected to the grid between 2023 and 2025 [2]. None of the 16 reactors scheduled for connection during this period were completed on schedule, contributing to the stagnation in operating capacity which fell by 0.5 GW to 368.6 GW globally [1][4]. Meanwhile, grid-scale battery storage capacity increased by 104 GW in 2025 alone, providing the necessary firming capacity that critics often cite as a barrier to renewable adoption [3][4].
Financial Instability in the Nuclear Sector
Investor confidence in nuclear ventures has shown signs of strain, exemplified by Holtec suspending an IPO intended to raise nearly $1 billion just days before its planned listing [1][5]. Peer company Fermi saw its stock value decline approximately 80% since its October 2025 listing, reflecting market skepticism regarding ground-level deliverables [1][5]. While global nuclear output increased by 1.1%, this growth was confined largely to China, with output declining in other regions despite high capital expenditure commitments [1][2].
Future Outlook and Small Modular Reactors
Projections for Small Modular Reactors (SMRs) remain a focal point of debate, with the European Union aiming to deploy its first units by the early 2030s [2]. However, industry reports note that SMRs have yet to realize claimed benefits regarding cost savings or waste reduction, with some designs projected to generate significantly more waste per unit than larger reactors [3][4]. As of July 1, 2026, 73 reactors were under construction globally, the highest count since 1987, yet the pace remains insufficient to match the 30% generation growth seen in solar power during 2025 [1][2].