The global solar industry posted a record-breaking year in 2025, adding 664 gigawatts of new photovoltaic capacity and pushing cumulative worldwide installed solar power above the 3-terawatt threshold for the first time in early 2026.

A Historic Milestone for Solar Capacity

The 664 GW of new solar PV brought online during 2025 represents the largest single-year addition the industry has ever recorded. The crossing of the 3 TW cumulative mark shortly afterward underscored the pace at which solar has scaled over the past decade, cementing the technology's position as one of the fastest-growing sources of electricity generation in the world.

Cumulative global operational solar capacity now exceeds 3 TW, a threshold that reflects sustained year-over-year buildout across multiple major markets. The milestone arrives as solar has become a dominant force in new power generation investment globally.

China's Expected Slowdown Clouds the Outlook

Despite the record 2025 figures, the near-term trajectory of the global solar market faces notable uncertainty. China, which has driven the majority of worldwide solar installations in recent years, is forecast to install less new solar capacity in 2026 than it did in 2025. Because of China's outsized share of global deployment, that anticipated decline is sufficient to place the overall world market on course for its first year-over-year contraction in more than two decades.

A contraction of this kind would be a significant inflection point for an industry that has grown almost continuously since the early 2000s. Whether other major markets can offset reduced Chinese volumes remains an open question based on the available reporting.

Context and Implications

The combination of a record-setting 2025 and a potentially contracting 2026 presents a complex picture for the solar sector. On one hand, the 3 TW cumulative figure and the 664 GW annual addition demonstrate the extraordinary scale the industry has reached. On the other hand, the degree to which a single national market — China — can determine the direction of global totals highlights how concentrated solar deployment remains at the top end.

Analysts and industry observers will be watching 2026 installation data closely to determine whether the forecast Chinese slowdown materializes as expected and whether it is deep enough to produce a measurable decline in the global annual figure, or whether momentum in other regions softens the impact.