Solar Power: How Sustainable is Stored Sunlight?

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This is a map that you can zoom in on. You can scroll around and you can even measure distances.


One of the constraints of solar power is that it is not always available: it is dependent on daylight hours and clear skies. In order to fill these gaps, a storage solution or a backup infrastructure of fossil fuel power plants is required — a factor that is often ignored when scientists investigate the sustainability of PV systems.

Whether or not to include storage is no longer just an academic question. Driven by better battery technology and the disincentivization of grid-connected solar panels, off-grid solar is about to make a comeback. How sustainable is a solar PV system if energy storage is taken into account?

Picture: Tesla’s lithium-ion home storage system.



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A young Boer I knew, Gilbert, told me of the time in the early 1990s when he served in the South African Army and was stationed in the townships. He described the tactics the Boers used to smash violent black crowds with a minimum loss of life.

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