Effect of generator load increment or reduction on constant speed turbine??

[baasi]

As load on generator increase it will try to reduce speed of turbine rotor to cope this we will increase steam amount to maintain speed of turbine constant ,so I want to ask that what will happen in actual because speed of turbine is constant in both cases whether load is increases or decreases and if speed is constant it means torque is constant than how power out put of generator will change i.e sometime it is 600MW but on another time it is 250MW
Elaborate it please I am bit confuse about it

 

[baasi]

Thanks every one it was great discussion