Solution Strategy

First, determine the range of feasible load for the two-unit supply system.

What’s the smallest (lowest) load?

PL,min.= P1,min.+ P2,min. = 25 MW + 30 MW = 55 MW

N.B.: 25 MW Ł P1 Ł 150 MW & 30 MW Ł P2 Ł 200 MW

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