Drive a few hours from Lisbon towards Spain, past the olive farms, and you will arrive at Europe’s largest artificial lake, at the Portuguese town of Alqueva. The first thing that catches the eye is the large hydroelectric dam. But look closer and you will also spot a bright patch of floating glass. It is the floating solar-power plant built by EDP, a Portuguese utility that is one of the world’s biggest developers of renewable energy. Critics have long dismissed such projects as a costly and trouble-prone experiment. The technology, however, is now ready to shine.
In this first phase of the project
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