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: 2. The water causes [[turbine]]s to turn.
: 3. The [[turbine]]s spin a generator which makes [[electricity]].
====Advantages====
*Do not produce pollution.
*Very reliable (high tide occurs twice a day).
*No fuel costs.
*Power output can be varied by opening and closing sluice gates to control the water flow.
====Disadvantages====
*Cost to build is quite high.
*Prevent access to boats.
*Tidal height varies throughout the year.
*Damages habitats by not allowing the natural flow of the tides.