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The expressions of fuel cost of two thermal generating units as a function of the respective power generation 
and 
are given as:
where 
is a constant. For a given value of , optimal dispatch requires the total load of 
to be shared as 
and 
. With the load remaining unchanged, the value of is increased by 
and optimal dispatch is carried out. The changes in and the total cost of generation, 
in Rs/hour will be as follows:
will decrease and 
will increase.
Both and will increase.
will increase and will decrease.
Both and will decrease.
If a is increased by 10% the slope of incremental cost of generator 1 increases so for economic load dispatch when IC1=IC2
Pa1 reduces & Pa2 increases
As a increases & Pa1 reduces there is slight change in F1
As Pa2 increases, F2 increase
∴ Overall cost F1 + F2 increases