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The requirements for making hydroelectric power from a river are:

* A wide area of land that can be flooded to create a lake behind a narrow point in a river. The area needs to be large in order for the dam to be efficient. A deep lake is very variable in pressure compared to a wide or long lake. * The narrow point needs to be at a point where the water can be dammed with the least effort for the dam to be efficient. If a huge dam is required, or there are low points nearby that need building up, it will be too expensive. * The change in height from the top of the dam to the bottom needs to be enough to make the dam worth building. * A consistent water flow of a useful volume for the amount of power generation required. * A location near as possible to the end use of the power to make transmission efficient.

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Q: What sort of rivers are suitable for making hydro electric power in NZ?
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