There are some constraints that should be considered in generating electrical power. Example of constraints such as Generator’s Output Limits, Piecewise Linear Cost Function, No-load Cost, Start up Cost, Demand, etc. These constraints should be considered before decision on the amount to be produced is decided.

Limit:: When the calculation of MC = Price give the amount of power is less the Pmin, the output should be Pmin. If the generator can be shut down, the shutdown it to reduce loss . If the the amount of power is more than Pmax, then produce at Pmax.

The no load and start up cost are example of quasi fixed cost. There are fixed during the specified condition only.

In fulfilling the demand, the generator also has the opportunity to sell or buy depending on the price. 

So the question is if the price is higher than MC, what should generator do? and what if the price is less than MC, what should the generator do? 

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