For the first time, solar power is expected to generate more electricity worldwide than nuclear energy in 2026, and wind power is projected to do the same, according to the International Energy Agency’s Electricity 2026 report. The twin crossovers mark a turning point decades in the making: nuclear plants that once represented the cutting edge of clean energy are being overtaken by technologies that barely registered on global generation charts a decade ago.
Underpinning the shift is an unprecedented buildout of battery storage. In the United States alone, utilities and developers plan to bring 24 gigawatts of new battery capacity online this year, a 60% increase over the record 15 gigawatts added in 2025, according to the U.S. Energy Information Administration. Those batteries are increasingly paired with solar farms, allowing electricity generated at midday to be dispatched into evening peak hours when demand is highest.
The numbers behind the crossover
The IEA’s supply outlook, published as part of the Electricity 2026 report, projects that solar PV generation will surpass both wind and nuclear output globally in 2026. Wind and solar combined are forecast to reach roughly 19% of global electricity generation, up from the 17% share recorded in 2025. Low-emissions sources overall accounted for 43% of global generation last year, according to the IEA’s separate Global Energy Review 2026, which reports backward-looking measured data rather than projections.
Nuclear output, by contrast, is projected to grow only about 2% between 2025 and 2026, according to the IEA’s Electricity 2026 report. That modest pace reflects the reality of nuclear construction timelines: new reactors routinely take a decade or longer to complete, while a large solar farm can go from financing to first power in 18 months. China has been the single largest driver of solar growth, installing more new solar capacity in recent years than the rest of the world combined, a pace that has pushed global module prices to historic lows and accelerated deployment everywhere from India to Brazil.
In the United States, the EIA’s 2026 planned-additions data shows 86 gigawatts of new utility-scale capacity in the pipeline. Solar accounts for 51% of those additions, with battery storage representing the next largest share at 24 gigawatts. The EIA’s battery storage analysis, updated in March 2026, details how co-locating batteries with solar farms has become standard practice, reducing grid congestion and improving the economics of both technologies.
What could change the outcome
These projections are forecasts, not final tallies. Actual generation figures for 2026 will not be published until well into 2027, and several variables could shift the outcome in either direction.
Weather is the most obvious wildcard. A year with below-average sunlight in key solar markets like China, India, or the U.S. Southwest would reduce solar output. Supply chain disruptions, including ongoing trade tensions over Chinese-manufactured solar panels and shifting tariff policies, could delay projects that are currently counted in the pipeline. On the battery side, individual projects tracked by the EIA through its monthly generator inventory can still be canceled or postponed, even after securing permits.
Nuclear generation carries its own uncertainties. The IEA’s roughly 2% growth estimate depends on reactor restarts in Japan, the performance of France’s aging fleet, and the commissioning schedule for new Chinese reactors. Unplanned outages at major plants could push nuclear output lower than expected, widening the gap with solar. Conversely, successful restarts or lifetime extensions could narrow it.
Global battery storage data also remains incomplete. While the EIA tracks U.S. projects at the plant level, no equivalent public dataset covers battery additions in China, Europe, or other major markets with the same granularity. The IEA has called for greater investment in grids and flexibility worldwide, but the specific gigawatt figures for international storage buildout are harder to verify. That means the “record battery storage” framing is strongest for the United States and less certain at the global level.
Why generation matters more than capacity
One distinction is critical for understanding this milestone. Solar’s installed capacity has exceeded nuclear’s in many regions for years, but installed capacity measures peak potential output, not actual electricity delivered. A solar panel produces nothing at night and less on cloudy days, which is why solar’s capacity factor (the share of its theoretical maximum that it actually generates) runs between 15% and 25% in most markets, compared with 80% to 90% for a nuclear reactor.
The IEA’s forecast speaks specifically about generation: the total electricity produced over the full year. The fact that solar is now projected to surpass nuclear on that measure, not just on nameplate capacity, reflects both the sheer scale of new installations and the growing role of batteries in shifting solar output to hours when it would otherwise be unavailable. Batteries do not eliminate solar’s variability, but they compress the gap between what solar panels can theoretically produce and what the grid actually receives.
How grid operators are responding to rising variable generation
Grid operators have not publicly tied reliability assessments to the 2026 solar-nuclear crossover specifically. Neither the North American Electric Reliability Corporation nor the European Network of Transmission System Operators has issued statements addressing the milestone. But the underlying challenge is well documented: as variable renewables claim a larger share of generation, grids need more flexibility through storage, demand response, transmission upgrades, or dispatchable backup power.
The IEA projects global electricity demand will grow at roughly 3.4% annually through 2030, driven by data centers, electric vehicles, and industrial electrification. Meeting that demand while maintaining reliability will require all low-emissions sources to perform, not just solar and wind but also nuclear, hydropower, and emerging technologies like long-duration storage. Solar’s move into a leading generation role is a significant marker, but the harder question is whether the supporting infrastructure, from transmission lines to grid-scale batteries, can keep pace with the panels going up on rooftops and in fields around the world.
The current evidence, drawn from the IEA’s global modeling and the EIA’s project-level U.S. data, supports the conclusion that 2026 will be the year solar and wind each outproduce nuclear for the first time. Whether that milestone holds when the final numbers are counted will depend on execution: projects completed on schedule, grids reinforced to handle new load patterns, and policies stable enough for the billions of dollars already committed to translate into electrons on the wire.
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*This article was researched with the help of AI, with human editors creating the final content.
