"Marketing" has nothing to do with it. The grid must (almost) perfectly balance production and consumption at all times. Failure to do that can result in the physical destruction of equipment, grid collapse, loss of life, A Really Bad Time, and many other things.
Which plants are used for regulation services is usually determined by cost to operate the service. If a hydro plant can provide regulation, great, since the water in the reservoir is already there and isn't going anywhere other than through the penstock sooner or later.
I also question whether or not your brother works anywhere near a hydro plant power house since the speed of the turbines is fixed by the number of poles in the generator and the line frequency. Which is to say that they are synchronized to the line frequency. And don't go ramping up and down all day long. Ever. They synchronize, lock, and stay locked. Physics makes sure that happens -- instantaneous and continuously.
Which plants are used for regulation services is usually determined by cost to operate the service. If a hydro plant can provide regulation, great, since the water in the reservoir is already there and isn't going anywhere other than through the penstock sooner or later.
I also question whether or not your brother works anywhere near a hydro plant power house since the speed of the turbines is fixed by the number of poles in the generator and the line frequency. Which is to say that they are synchronized to the line frequency. And don't go ramping up and down all day long. Ever. They synchronize, lock, and stay locked. Physics makes sure that happens -- instantaneous and continuously.
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