20. The total spinning reservefrom all the generating units must be greater than or equal to the spinning-reserve requirement of the system. This can be either a fixed requirement in MW or a specified percentage of the largest output of any generating unit.
21. Minimum up time : Once the unit is running, it should not be turned off immediately.
22. Minimum down time: Once the unit is de-committed (off), there is a minimum time before it can be recommitted.
23. The output powerof the generating units must be greater or equalto the minimum powerof the generating units.