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: 4. The turbine causes a generator to spin.
: 5. The generator makes an electrical current.
====Advantages====
*Reliable source as it is built in places that do not suffer drought.
*Power provided can change at a moments notice by allowing more water through the turbines.
*Low running costs and no fuel cost.
====Disadvantages====
*Expensive to build.
*Require the flooding of a large area of land.
*Destroys habitat of some creatures.
*Blocks the migration of some river species.
*Can only be built in certain locations.