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It makes no difference what powers them, energy is interchangeable - if the data center doesn't use it, someone else will.

Energy isn't interchangeable across the globe. A lot of alternative fuel sources are in remote and underserved locations (Iceland has lots of geothermal); it's economically worthwhile to ship bauxite there, but not worthwhile to build a HVDC circuit to power a plant in downtown London from Icelandic power.

An even more clear example is that natural gas is about 30% the price in the US Midwest as it is in Europe or the rest of the world market. That's the whole point of the Keystone XL pipeline. Even oil has a 20% spread right now between central USA and coastal USA/world.

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