GRID · FIELD GUIDE
Where the World's Solar Power Is — and Why Only Some of It Is on the Map
Solar panels are going up faster than any other power source on the planet — so where are the big solar farms, why are the record-holders all in deserts, and why does a worldwide map of them look as though Europe and the United States have most of the world's solar when China has far more?
Solar is the fastest-growing source of new electricity on Earth, and this layer maps where the utility-scale fleet sits — each plant a solar-gold sun sized by how much power it can produce. Switch it on and the pattern emerges: dense across Europe and the American Southwest, ringed around the sunbelt, with the true giants standing in the deserts of India, the Gulf, Egypt and China.
A farm, not a rooftop
The unit is the utility-scale plant — a field of panels feeding the grid, not the panels on a house. That distinction, plus a data reality, shapes the whole layer. OpenStreetMap holds roughly 100,000 things tagged as solar plants, but only about a sixth carry a capacity figure, and most of the untagged ones are small rooftop or community arrays. Rather than scatter tens of thousands of sizeless, identical dots, this maps the plants where size is actually known — the utility-scale fleet — and is honest that that's a slice of the whole.
The desert giants
The record-holders are all in deserts: strong reliable sun, cheap open land, nothing to shade the panels. India's Bhadla and Pavagada, the Gulf mega-projects (Dubai's Mohammed bin Rashid, Abu Dhabi's Al Dhafra), Egypt's Benban and China's Tengger each reach 2 gigawatts or beyond — millions of panels across tens of square kilometres. The catch is distance: the desert is often far from demand, so big solar leans on long-distance transmission to reach the cities.
Read the map carefully
As with wind, the most important caveat is what the map isn't. It shows where solar is mapped with a capacity figure, and OpenStreetMap is mapped most thoroughly in Europe and North America — so those regions dominate, even though China has built more solar than anywhere else on Earth and India is among the leaders. The desert giants are present; the long tail of Chinese and Indian utility solar behind them is largely untagged. And because OSM's solar capacity values are noisy, the build drops impossible figures and filters the records list region by region so the real giants come through.
Solar is only half of the renewables story. The other half is wind — which often blows when the sun is down — and the grid built to tie variable, far-flung clean power to the cities that use it. Turn those on alongside this layer to see the whole system at once.
Frequently asked questions
What counts as a 'solar farm' — and why is only some of it mapped?
A solar farm (or solar park) is a utility-scale plant: a large field of panels feeding power into the grid, as opposed to the panels on a house roof. The map draws these utility-scale plants, sized by capacity. The catch is data: OpenStreetMap holds around 100,000 things tagged as solar plants, but only about 16% carry a capacity figure, and most of the untagged ones are small rooftop or community installations rather than true farms. Drawing tens of thousands of sizeless dots would tell you nothing — just a uniform speckle — so this layer maps only the plants where a real size is known. It's an honest slice: the utility-scale fleet, not every panel.
Why are the biggest solar farms all in deserts?
Sunlight, land, and cost. Deserts get intense, reliable sun with few cloudy days, they have vast amounts of cheap, flat, otherwise-unused land, and there's nothing to shade the panels. That's why the record-holders cluster in sunny, open country: Bhadla and Pavagada in the Indian desert, the Gulf mega-projects in the UAE and Saudi Arabia, Benban in Egypt's Western Desert, and Tengger in China. These parks reach 2 gigawatts and beyond — millions of panels across tens of square kilometres. The main downsides are distance (the desert is often far from the cities that need the power, so it leans on long-distance transmission) and heat, which actually makes panels slightly less efficient.
Why does the map look Europe- and America-heavy when China leads solar?
Because the map shows where solar is mapped, not where it is — and for solar that gap is huge. The data comes from OpenStreetMap, which is mapped most thoroughly in Europe and North America, so those regions dominate the plants shown here. In reality China has installed more solar than any other country on Earth by a wide margin, and India is among the leaders, but the bulk of their utility solar simply isn't tagged with a capacity figure in OSM. The famous desert giants show up, but the long tail behind them is missing. So the regional counts are a guide to the mapping effort, not a ranking of solar power.
How big is a solar farm — what do the sizes on the map mean?
Each sun is sized by the plant's capacity in megawatts (MW). The median mapped plant is only about 5 MW — a modest field — while the desert giants run past 2,000 MW (2 GW). The sizes use a square-root scale so the small and large both read, capped at 2.5 GW. One honesty note: OSM's solar capacity tags are noisy, with occasional wild errors (a plant once tagged at 3.75 terawatts — a typo, since that's more than all the solar on Earth). The build drops anything over 3.5 GW as a bad tag, and filters the 'biggest parks' list region by region so a mis-tagged European entry can't outrank a real desert giant. A rooftop array tagged as a plant, if it has no capacity, simply isn't shown.
How does solar pair with wind on the grid?
They complement each other, which is why this canvas shows both. Solar peaks in the middle of the day and produces nothing at night; wind often blows hardest in the evening, overnight, and in winter, when solar is weak. A grid with both has a smoother combined output than either alone. But both are variable, so a renewable-heavy grid needs strong transmission to move power between regions, plus storage (batteries, pumped hydro) to shift daytime solar into the evening. Switch on the Wind Farms, Transmission and Power Plants layers alongside this one and you can see the whole system: the generation, clean and conventional, and the wires built to tie it together.
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