Solar Surge: Global Capacity Triples in Less Than Two Decades, China Drives the Revolution
The relentless rise of solar energy is one of the defining stories of the 21st century. It took a decade to reach the first terawatt – a staggering 10 years to go from 100 gigawatts installed in 2012. Adding a second terawatt, enough to power the entire United States, took just under three years. And then, in 2026 – a date still subject to minor analyst variations – the world crossed the 3 terawatt threshold, largely unnoticed.
A Quiet Transformation
“You’re increasingly seeing solar panels everywhere you look,” observes Lara Hayim, solar analysis lead at BloombergNEF. “Whether you’re traveling by train in the UK, it’s almost unavoidable.” This visual ubiquity is only set to increase, with projections indicating a solar capacity exceeding 9 terawatts by 2036 – a figure that will likely seem almost quaint in the years to come.
However, a closer examination of the data reveals a fascinating dynamic. The initial terawatt milestone was largely fueled by developed nations’ subsidies designed to stimulate solar panel deployment. Meanwhile, China and emerging economies initially viewed photovoltaic technology as prohibitively expensive. That equation shifted dramatically with the second and third terrawatts, as China took the lead, becoming the primary engine of global growth. Despite the accelerated global rollout, the portion of installed capacity attributable to lower-income countries has remained largely stagnant since 2020.
Google is reportedly exploring nuclear power to fuel its data centers, ravenous for energy. “China has undeniably been the principal driver of this global story,” Hayim emphasizes. “But digging deeper, you also begin to see genuine solar booms in other countries.” Nations like Pakistan, Nigeria, and the Philippines have experienced extraordinary growth in rooftop and commercial solar installations in recent years. Smaller markets, including Cuba and Lebanon, have also witnessed rapid expansion.
Consequently, the number of countries boasting at least one gigawatt of installed solar capacity has swelled to 74 – a significant increase from the 42 recorded in 2020. In China, solar deployment has outpaced the development of supporting infrastructure, such as electric grid expansion and battery storage systems. This has resulted in curtailment of production during peak generation hours, effectively wasting a portion of the energy produced.
A Shift in Priorities
As a result, analysts predict a moderation in growth rates in China. Beijing’s five-year plan outlines measures to increase renewable energy consumption by over 50%, prioritizing production rather than simply expanding it. BloombergNEF expects the share of developing countries in global solar deployment to rebound this year. These economies currently operate from extremely low levels of solar penetration in their electrical grids and are still far from reaching the limitations faced by China and other major markets.
By 2036, more than a quarter of all installed solar capacity is projected to originate in developing countries, while the share of developed economies will fall to approximately 20%. The rise of solar has been facilitated by countries overcoming local obstacles, from workforce shortages to the complexities of managing grids with high levels of intermittent renewable energy. Despite these challenges, Hayim believes that access to financing remains the primary impediment for developing nations. Yet, a theoretical limit exists to the amount of solar energy that can be integrated into a grid. Once photovoltaic production covers peak daytime demand, further capacity adds no value.
Countries like Australia and California, with some of the world’s highest solar penetration rates, frequently experience negative electricity prices during the day – a clear indication of excess generation. Battery-ion technology is extending the lifespan of solar growth, storing surplus energy for later use, as demonstrated by Australian government incentives. This trend is also gaining traction in developing nations like Pakistan and the Philippines, alongside rapid growth in energy storage.
“Without sufficient energy storage capacity, it’s impossible to fully realize the potential of solar,” Hayim concludes. The data speaks for itself: the global solar revolution is not slowing down.”