Like how if I have a river, I can install multiple dams in series to get more energy instead of having just one dam.
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It sounds like you’re asking why you couldn’t just have multiple turbines in series and essentially get more energy for free.
Steam turbines basically ‘use up’ the pressurized steam that goes through them. Hot pressurized steam goes in, and liquid water (plus a small amount of low pressure steam) comes out. There is no more energy left to drive another turbine downstream.
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