Solar Met Three-Quarters of 2025 Electricity Demand Growth

Estimated reading time: 5 minutes · Last updated: 1 November 2026

Solar met about three-quarters of global electricity demand growth in 2025, the same year it passed nuclear in total generation, according to data from Ember. In the 12 months to September 2026, solar plants worldwide produced 13% more electricity than every nuclear reactor combined. Three forces drove the shift: low-priced Chinese modules, cheaper batteries, and fast uptake in markets from Pakistan to Australia. Solar supplied roughly 1% of the world's power in 2016 and is expected to reach 10% in 2026, while nuclear output has barely moved since 2000. The constraint now is less about panels than about whether grids and the institutions running them can absorb the growth.

Solar is now the engine of the power transition.

Jan Rosenow, professor of energy and climate policy, University of Oxford

How Solar Overtook the World's Nuclear Fleet

Ember's figures put the crossover in 2025, when global solar generation edged past nuclear. By the 12 months ending September 2026, the gap had widened to 13% in solar's favour. Dave Jones, a co-founder of Ember, called the milestone "a pretty insane stat, for sure," as first reported by BBC Future.

The overtaking came from two lines moving very differently. Nuclear generation has stayed roughly level since 2000, so solar did not need to push reactors off the grid to pass them. It only had to keep adding capacity, and its share of world electricity climbed from about 1% in 2016 toward an expected 10% in 2026.

Jan Rosenow, professor of energy and climate policy at the University of Oxford, describes solar as the main driver of the power transition. The demand figures support him: of all the extra electricity the world consumed in 2025, about three-quarters came from solar. The 10% share for 2026 remains a projection until full-year data arrive.

Why Cheap Modules and Batteries Changed the Economics

Price explains most of the acceleration. "Massive Chinese manufacturing scale and current overcapacity have pushed module prices to record lows," Rosenow said. Overcapacity means factories can turn out more panels than buyers currently absorb, which drags prices down. Jones described the market as "offensively cheap" for purchasers.

Storage carries that advantage past sunset. "Solar plus storage is now routinely cheaper than new fossil plants in sunny regions," Rosenow said, adding that "Batteries have largely solved the daily problem of shifting midday sun into the evening." His claim covers the daily cycle; longer gaps, such as a dull winter week, fall outside it.

The economics hold in the United States too, which ranks second for installations behind China. Alicia Zhao, a University of Maryland specialist in US mitigation pathways, said solar keeps expanding because it remains "one of the cheapest sources of new power in the US."

Pakistan, India and Australia Show Different Routes to Scale

Australia's growth came from rooftops. More than 4 million homes there carry solar panels, well over one-third of households. India took a utility-scale path, with newly added solar meeting 60% of the country's additional power demand.

Pakistan shows what happens when the grid itself is the problem. Solar's share of its electricity went from under 2% in 2019 to 24% in 2026. Costly and unreliable grid supply pushed households and businesses toward panels, and inexpensive imports from China made the switch affordable. Where outages are routine, a rooftop system works as both a bill cutter and a backup supply.

Across Africa, countries are installing about 100,000 solar panels a day. In the United States, one study estimated that expanding wind and solar output produced $249 billion in climate and health benefits between 2019 and 2022, through lower pollution-related costs as well as lower energy spending.

Can Grids and Institutions Keep Pace With Solar?

Rosenow frames the next phase as an institutional test rather than a hardware one. "The bigger question is no longer whether solar grows but whether our power systems and institutions can keep up," he said.

New formats are spreading generation into places grids were not designed around. Germany has seen fast growth in plug-in balcony solar, small panels that connect through a household socket, and similar systems have been approved in places including California. Agrivoltaics, the practice of growing crops and running solar panels on the same land, is being promoted as an answer to land-use objections.

Storage is moving into homes as well. Vermont is among the states starting grid-linked home battery rollouts, frequently paired with rooftop solar. Each of these approaches adds capacity, but each also adds devices that grid operators must coordinate, which is precisely the pressure Rosenow describes.

What could speed or slow solar's lead

The bottom line

Solar's rise from about 1% of world electricity in 2016 to an expected 10% in 2026 rests on prices rather than policy promises. Chinese overcapacity has driven module costs down, batteries now shift daytime output into the evening, and markets with weak grids, Pakistan above all, have adopted panels as a practical fix. Passing nuclear in 2025 was a symbolic marker, made easier by nuclear's flat output since 2000. The harder measure is Rosenow's: whether power systems and institutions can manage millions of rooftops, balcony kits and home batteries. Ember's full-year 2026 numbers will confirm the share; grid adaptation will decide what happens after that.

What to watch

• Watch for Ember's full-year 2026 figures, which will show whether solar actually reached 10% of world electricity; no release date has been set.
• Watch whether more US states follow Vermont with grid-linked home battery programmes; no timetable has been given.
• Watch for further approvals of plug-in balcony solar beyond Germany and California; no dates have been announced.