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Solar power’s rise is often told as a climate story. Stephanie Pappas’s feature makes a broader argument: solar has become a force in the world economy because it is now extraordinarily cheap, fast to deploy and difficult to embargo once installed. The technology still depends on concentrated manufacturing and supportive policy, but its fuel arrives everywhere for free.

The contrast with 1979 is striking. President Jimmy Carter’s 32 White House solar panels cost about \$160,500 in 2026 dollars and merely heated water. Modern photovoltaic systems generate electricity, typically repay the energy used to manufacture them within one or two years, and have reached a scale that once seemed implausible. In 2025 the world added 600 terawatt-hours of solar generation, roughly enough to supply Canada for a year. Solar provided more new global electricity than any other source, while total solar output had grown nearly nineteenfold since 2014.

How Solar Became the Cheapest Option

The cost collapse came from many improvements reinforcing one another. Standard commercial panels now convert about 20 percent of incoming sunlight into electricity, while the best home systems approach 22 percent - a level that was confined to research hardware in the 1970s. More efficient cells need less glass, wiring, land and structural support for the same output.

Manufacturers also learned to capture more light and lose less energy. Passivated emitter and rear cells added a reflective layer behind the silicon. More recently, tunnel oxide passivated contact cells have gained ground because they combine higher efficiency with mass production. Meanwhile purer materials, tighter process control, larger factories and highly integrated supply chains reduced the cost of every module.

Those gains changed the economics. The article cites a 2025 estimate that new utility-scale solar produces electricity for roughly \$38 to \$78 per megawatt-hour over a project’s lifetime, compared with \$48 to \$109 for a new natural-gas plant. Global utility-scale project costs fell from about \$5,300 per kilowatt in 2010 to \$758 in 2023, while installed solar capacity grew from 41,000 megawatts to about 2.4 million megawatts. Cheap equipment then expanded the market, and the larger market financed still more manufacturing and innovation.

Germany Created Demand; China Built the Machine

No single invention explains the transition. In the early 2000s Germany subsidized rooftop solar, creating a dependable market just as China was expanding industrial capacity. When demand fell after the 2009 financial crisis, Beijing protected manufacturers, stimulated domestic installation and invested heavily in research. It also pushed firms to consolidate, helping create a vertically integrated industry able to improve quality while cutting unit costs.

The result is formidable concentration. As of 2024 China produced more than 93 percent of the world’s polycrystalline silicon, nearly 97 percent of its silicon wafers, about 92 percent of photovoltaic cells and roughly 86 percent of finished modules. It also became the largest market for its own products. Solar now supplies about a tenth of China’s electricity, and renewables met all of the country’s new power demand in 2025 even as total consumption continued to grow. Chinese firms are also positioned to commercialize higher-efficiency tandem cells, often pairing silicon with perovskites.

This history complicates any simple claim that market forces alone made solar inevitable. Public subsidies created early buyers; industrial policy built manufacturing depth; scale and technical learning then made solar competitive even where political support weakened.

Energy Access without Waiting for a Grid

Low prices matter most where conventional infrastructure is slow or unaffordable. Solar panels can be installed one roof at a time, without waiting years for a power plant and transmission line. In rural Uganda, a program trains women to install systems in communities that still rely on grass or firewood for light. Across Africa, 4.5 gigawatts of solar capacity were installed in 2025, a 54 percent increase from the previous year. Trade data suggest that small installations, not only utility projects, account for much of the growth.

Pakistan shows how quickly decentralized adoption can reshape a national power system. Between 2022 and 2025 its solar generation rose from 7.7 to 36.6 terawatt-hours and exceeded 20 percent of the country’s electricity. The article links the surge to inexpensive Chinese panels, favorable import rules and fossil-fuel price shocks after Russia’s invasion of Ukraine. A cited analysis estimates that solar helped Pakistan avoid \$12 billion in oil and gas imports from 2018 through 2025.

Cuba’s expansion was similarly crisis-driven. Facing an oil embargo and repeated blackouts, the country increased annual imports of Chinese solar equipment from the equivalent of 19.4 megawatts in 2023 to 1,308.8 megawatts in 2025. Distributed systems can also provide pockets of power after hurricanes damage a central grid.

Independence Comes with a New Dependency

Solar weakens one geopolitical vulnerability while creating another. A country with panels on its roofs is less exposed to an interrupted oil shipment or a closed maritime chokepoint. Installed panels keep receiving sunlight regardless of foreign policy. Yet future expansion depends heavily on Chinese factories and raw-material processing, and export restrictions could slow new projects. India and Southeast Asian countries are building more manufacturing capacity, but China retains a vast lead.

The article is strongest as an account of why adoption has accelerated, not as a complete model of an electricity system. The quoted generation costs do not by themselves price the storage, transmission and grid management needed when sunlight is unavailable. Nor does cheap equipment erase financing barriers: borrowers in developing economies may face interest costs that make even a fast-paying project difficult to start. Policy, capital and infrastructure still determine who can use the technology.

The central change is nevertheless durable. Solar no longer needs to win primarily as an environmental sacrifice. It can win because it is often the least expensive new source of electricity, because a household or village can deploy it incrementally, and because its energy supply cannot be seized in transit. The same policies that helped create a concentrated global industry also drove prices low enough to give countries and communities a practical route around fossil-fuel dependence.