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There is an important difference between this question and another common question in this category. (How does electricity flow from a power station to your home?)

Power stations connected to an electricity network (for example a national electricity grid) generate electricity as alternating current. The electricity generators in these power stations spin at 3000 RPM. (That is for a 50 Hz network - for a 60 Hz network they spin at 3600 RPM.) They are called Synchronous Machines, that is, they all spin at exactly the same speed. It's as if they were connected mechanically, even though they are not in the same location, and only connected by wires.

The electricity flow from one region to another and therefore one power station to another depends on the voltages at each of the regions. To say that electricity flows from one power station to another would not be quite correct, as all power stations export electricity if they are on-line and generating. (If they are off-line they might import small amounts of electricity.)

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