Sometime in 2026 C.E., the world crossed a threshold that would have seemed impossible a decade ago: three terawatts of installed solar power capacity. No announcement marked the moment. No ceremony. Analysts are still debating the precise timing. But the number is real, and what it represents — and what it doesn’t yet fully represent — tells a complicated, hopeful story about who is gaining access to this technology and who is still waiting.
At a glance
- Solar capacity: The world crossed 3 terawatts of installed solar in 2026 C.E., after adding the second terawatt in under three years and the third in less than two years after that.
- Global solar access: The number of countries with at least one gigawatt of solar installed grew from 42 in 2020 C.E. to 74 by 2025 C.E., with new booms appearing in Pakistan, Nigeria, and the Philippines.
- Solar deployment forecast: BloombergNEF projects total installed solar capacity will exceed nine terawatts by 2036 C.E., with developing countries’ share expected to grow past 25% of all new deployment.
How we got here
The pace of solar’s rise has been startling even to people who have watched it closely. The world crossed the 100-gigawatt mark in 2012 C.E. It took another 10 years to reach one terawatt. The second terawatt came in under three years. The third arrived less than two years after that.
Each phase of the boom has had a different character. The first terawatt was largely the story of wealthy nations subsidizing early adoption, while China and much of the developing world found photovoltaics too expensive. That changed sharply going into the second and third terawatts. China picked up the baton, driving deployment at a speed no country had matched before.
The visual evidence is spreading. “Take a train anywhere, say in the U.K., and you’re likely to spot solar panels,” said Lara Hayim, head of solar research at BloombergNEF. That signal, she notes, is only going to get stronger.
The geography is shifting — but unevenly
China’s dominance of the global solar story is real, but the data beneath it is changing. Even as overall deployment has accelerated, the share going to lower-income countries has largely stalled since 2020 C.E. That is now starting to reverse.
Countries like Pakistan, Nigeria, and the Philippines have seen sharp increases in rooftop solar installations in recent years. Smaller markets including Cuba and Lebanon have also seen rapid uptake. It’s why the number of countries with at least one gigawatt of solar installed reached 74 last year, up from 42 in 2020 C.E. BloombergNEF expects that developing countries will account for more than a quarter of all solar deployment by 2036 C.E., while wealthy countries’ share falls to around 20%.
This story is part of a broader pattern of clean energy milestones accumulating faster than most people realize.
China’s ceiling and what comes next
China’s extraordinary buildout has outpaced supporting infrastructure. Transmission lines and battery storage have not kept up with solar generation, leading to curtailment — solar power produced during peak hours that simply goes to waste. Analysts expect Chinese deployment to slow as a result. In its latest five-year plan, China announced measures aimed at increasing renewables consumption rather than production, by more than 50%.
That slowdown creates space for other countries to drive the next phase of growth. Most developing nations are starting from very low solar penetration and won’t hit the same grid constraints anytime soon. In places like Australia and California, where solar penetration is among the highest in the world, electricity prices already go negative during daytime hours — a sign that more panels without more storage adds little value.
Lithium-ion batteries are becoming the critical next layer of the transition. In Australia, home battery subsidies have encouraged storage adoption alongside solar. In Pakistan and the Philippines, a battery boom is following the solar boom regardless of policy incentives. BloombergNEF’s Hayim is direct about what this means: “Without enough energy storage, you cannot maximize solar’s potential.”
The constraint that numbers don’t show
The most important limitation is not technical. Developing countries’ main barrier to faster adoption, Hayim says, remains the lack of accessible financing. Panels are cheaper than they have ever been. The economics are clear. But credit markets in lower-income countries have not kept pace with the technology’s falling costs, leaving millions of potential adopters on the wrong side of the opportunity.
The solar industry has overcome a long list of local challenges — shortages of skilled workers, grid management complexity, permitting delays — but affordable financing for lower-income communities and countries remains an unsolved problem. Until it is solved, the global milestone numbers will continue to obscure a quieter, harder story about who is still waiting.
The 3-terawatt threshold will itself look modest quickly. At current trajectories, the question is less whether solar transforms the global energy system and more whether that transformation reaches everyone. The answers to that question are being written right now, in countries the first wave of the solar boom largely passed by.
Read more
For more on this story, see: Bloomberg: The World Crossed a Major Solar Milestone. No One Noticed
For more from Good News for Humankind, see:
- China becomes the first country to reach one terawatt of solar power
- India’s Gujarat solar park and the country’s solar rise
- The Good News for Humankind archive on renewable energy
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