When it opened here in 2004 on a reclaimed mining dump, the Geosol solar plant was the biggest of its kind in the world. It is so clean and green that it produces zero emissions and so easy to operate that it has only three regular workers: plant manager Hans-Joerg Koch and his two security guards, sheepdogs Pushkin and Adi.
The plant is part of a building boom that has made gloomy-skied Germany the unlikely global leader in solar-generated electricity. Last year, about half of the world’s solar electricity was produced in the country. Of the 20 biggest photovoltaic plants, 15 are in Germany, even though it has only half as many sunny days as countries such as Portugal.

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