Power station output varies widely as a function of what is being used as a power source. There are upper limits like the number of turbines that can take advantage of water behind a dam. Too many turbines will draw the water level down quickly and output will diminish. Nuclear reactors can be constructed that are "so big" and are designed with an upper limit on size. Only by adding more reactors can output be increased. Same with coal fired power plants. That's the upper limit as regards commercial power plants. Lower limits on power stations will follow dictates of economy and availability of energy resources. Commercial power plants produce anything from a few kilowatts to several megawatts or several tens of megawatts. There are a number of variables, and they can be assessed with some thought. Use the link below to the Wikipedia article on power stations and check out those variables.
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Hydro plants range in size from arbitrarily small to the largest power plant in the world.
On the small side, there are hydro power generators that literally can fit onto a person's hand, with very small output. Some people use very small generators to produce power for their homes or for other off-grid use of power. There is no reason why a much smaller model could be produced, though it would probably not have a practical application.
The Three Gorges Dam in China is the largest electric plant in the world, in terms of output. It currently has an output of 18,200, but will not achieve full power until 2011, when its output will be 22,500 MW. This is several times the output of a large nuclear facility.
Yes, in fact, the average power station produces over 100,000,000 Mega watts of power. Due to the millions of hamsters and gerbils being forced to run on wheels to generate thi power, it does help America. Especially when the Gerbils have babies and they produce even more gerbils to make electricity. If the gerbil is tired or even thinks of having a break, they are sent to a shower room full of poison gas to die and be burned alive to not waste space. Think of it like the Gerbil Holocaust my child.