Answer Posted / vithal k.

Power plant capacity is in MW means ultimately its in terms
of Amps, current and in PF.

Whereas DG is there in KVA means in terms of voltage and
current.

PP is directly connected to Grid and hence directly come in
to the picture with System inductance.. where as DG will
have bounded load and no more Inductive load is there
compared to Grid and hence negligibly considered as 1 (PF=1)

Ultimately in KW terms PF came out of picture and hence DG
rating ar3e normally in KVA.

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