Steam power plants do not inject water into the turbines as it would cool the steam and remove energy from it. The whole purpose of a steam turbine is to extract energy from steam. They do not however extract so much energy from the steam that it starts to condense in the turbine. Condensation is taken care of in the condensor or cooling towers. This is done to avoid erosion of the turbine blades. If they did extract so much energy from the steam that it did condense in the turbine, they could get more energy out of it. Since turbines for steam power plants are very very expensive, the extra energy extracted by allowing condensation in the turbine is not cost effective when the added expense of the turbine wear is considered.
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