Answer: It increases the air temperature.
Step-by-step explanation:
A thermal power station is a power house in which heat energy is converted into electrical energy. In these power plants generally the water is heated so as to obtain the thermal energy in the form of steam which when spins in a steam turbine can be used to generate electricity in a generator.
As the heat energy is obtain from a boiling water that is in the form of stream. Therefore, it is expected to increase the surrounding air temperature.