The Physics Behind the Spanish Blackout
When a grid failure plunged 55 million people in Spain and Portugal into darkness at the end of April, it should have been a wake-up call on green energy. Climate activists promised that solar and wind power were the future of cheap, dependable electricity. The massive half-day blackout shows otherwise. The nature of solar and wind generation makes grids that rely on them more prone to collapse—an issue that’s particularly expensive to ameliorate. […]
Grids need to stay on a very stable frequency—generally 50 Hertz in Europe—or else you get blackouts. Fossil-fuel, hydro and nuclear generation all solve this problem naturally because they generate energy by powering massive spinning turbines. The inertia of these heavy rotating masses resists changes in speed and hence frequency, so that when sudden demand swings would otherwise drop or hike grid frequency, the turbines work as immense buffers. But wind and solar don’t power such heavy turbines to generate energy. It’s possible to make up for this with cutting-edge technology such as advanced inverters or synthetic inertia. But many solar and wind farms haven’t undergone these expensive upgrades. If a grid dominated by those two power sources gets off frequency, a blackout is more likely than in a system that relies on other energy sources.
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