Solar PV and battery manufacturing capacity already exceeded 2024 global demand by more than double and more than triple respectively, according to the International Energy Agency’s Energy Technology Perspectives 2026. That overcapacity, not a straightforward growth story, is the more useful lens for reading the record 1.1 trillion dollar market value the same report attributes to key energy technologies in 2025.
The IEA’s ETP-2026 commentary puts the combined 2025 market value of solar PV, wind, batteries, electric vehicles, heat pumps and electrolysers at more than 1.1 trillion dollars, following average annual growth of around 20% over the past decade. That figure was reached despite, not because of, favorable pricing: solar PV module prices fell by roughly 50% and battery pack prices by around 30% between 2023 and 2025. A market value metric that keeps climbing through a 50% price collapse in its largest technology category is understating the scale of what is actually being deployed, since volume growth had to outpace that price decline just to keep the dollar total rising, a distinction the headline figure alone does not convey.
The more consequential number sits underneath the market value figure. IEA’s own accounting shows installed manufacturing capacity in 2024 was more than double global demand for solar PV and more than triple demand for battery cells, excluding any inventory build. That is not a minor imbalance. It means the industry could, in principle, meet current global demand for batteries using roughly a third of the factories already built, and still have meaningful spare solar manufacturing capacity left over. Manufacturing investment in these technologies has responded accordingly, falling from nearly 220 billion dollars in 2023 to an estimated under 200 billion dollars in 2025, with solar PV investment more than halving amid what the report describes as significant surplus capacity and margin compression concentrated in China. That decline is not evidence of a cooling market so much as a rational response to a market that, by the IEA’s own numbers, already has more capacity than it needs to meet current deployment, leaving room for demand to keep growing for some time without requiring a proportional new wave of factory construction.
China’s position within that overcapacity is central to understanding where the pressure is likely to land next. The country accounts for around 70% of cumulative global manufacturing investment in these technologies since 2020, and its domestic production now exceeds domestic demand across every category the report examines, making export markets structurally necessary rather than optional for Chinese producers. Solar PV output has grown thirteenfold over the past decade to almost half a terawatt annually, with around 40% of that increase directed to export markets, and the IEA projects that between 40% and 50% of the growth in China’s production of electric cars, battery cells and heat pumps over the next decade will similarly depend on exports. That dependency is colliding with a trade environment the same report documents as tightening sharply. The announced trade weighted global average tariff and duty rate across the solar PV supply chain rose ninefold in a single year, from 2023 to 2024, reaching around 36%, and the report describes a broader proliferation of anti-dumping measures, local content provisions and subsidy regimes across the technologies it tracks. China’s own strategy assumes continued access to the export markets that are simultaneously erecting the barriers most likely to constrain it, a tension the report lays out in its data without fully naming it as a structural contradiction.
That tension has not yet shown up in trade volumes. Despite the tariff increases, the gross value of international trade in these technologies climbed to record levels in the second quarter of 2025, and China’s gross exports across the categories reached more than 160 billion dollars in 2025, up 11% year over year, giving it more than 35% of global gross exports in these products, or roughly half once intra-EU trade is excluded. Whether that resilience reflects a lag between tariff announcements and their effect on shipment volumes, buyers accelerating purchases ahead of further restrictions, or trade increasingly routed through intermediary countries not yet subject to the same measures is not something the report’s aggregate trade figures can distinguish, but the gap between rapidly rising tariff rates and still rising trade volumes is itself worth tracking as either an early warning or a sign that the restrictions are being absorbed more easily than their headline rates suggest.
The regional manufacturing investment gains the report highlights as evidence of diversification away from China deserve a similarly careful read. European Union investment in these technologies nearly doubled between 2023 and 2024, aided by the Net Zero Industry Act and Clean Industrial Deal, Korea’s battery and EV manufacturing investment rose 25%, and India’s clean energy investment climbed more than 65%. Those are genuine increases, but the report also notes that China is associated with a significant share of manufacturing investment occurring in other countries through its own foreign direct investment, meaning some portion of the diversification the headline regional figures suggest may still trace back to Chinese capital and, in some cases, Chinese equipment and components assembled elsewhere. Separating genuine geographic diversification of manufacturing capability from Chinese-financed capacity relocated to jurisdictions with more favorable trade treatment is not something the aggregate investment totals resolve on their own.
The report’s framing of energy security as an increasingly important, independent driver of demand, alongside cost competitiveness, points directly at events with concrete and recent economic weight. The commentary cites the conflict in the Middle East that began on February 28, 2026, alongside Russia’s invasion of Ukraine, as developments that have pushed energy security higher up the policy agenda. That February conflict triggered Iran’s closure of the Strait of Hormuz to commercial shipping, a waterway that in 2025 carried roughly a quarter of the world’s seaborne crude oil trade and close to a fifth of global liquefied natural gas shipments, and sent Brent crude from around 75 dollars a barrel to more than 100 dollars a barrel within days. Set against that kind of shock, the IEA’s broader point that clean energy technology deployment is increasingly driven by factors other than climate policy carries specific, dated evidence rather than a general observation about rising energy anxiety.
Two figures in the report also usefully separate how much of this market actually crosses borders from how much is produced and consumed domestically. The global traded value of fossil fuels in 2025 was around 1.6 trillion dollars net, described as roughly six times the equivalent figure for key energy technologies, implying cross-border trade in clean energy technologies of somewhere in the range of 260 to 270 billion dollars against the 1.1 trillion dollar total market value cited for the same year. That gap suggests the large majority of the 1.1 trillion dollar figure still reflects technology produced and consumed within the same country rather than shipped internationally, which matters for how much leverage tariffs targeting cross-border flows can realistically exert on a market where domestic manufacturing and domestic deployment already account for most of the value. The IEA’s own long-range projections carry a similarly wide range, from 1.9 trillion dollars by 2035 under policies currently in place to 2.6 trillion dollars if governments’ stated but not yet enacted intentions are also realized, a spread of close to 37% that reflects how much of the next decade’s trajectory still depends on trade and industrial policy choices that, based on the tariff and investment data in the same report, are currently moving in directions that do not obviously converge.
