Solution Strategy (cont.)
As the load increases more and more, l1(P1) also increases.
So this economic policy of serving load increases using # 1 remains in force until ... (?)
# 1’s l1 “catches up to” # 2’s l2 (which is fixed at 2.84 $/MWh).
l1(P1) = 0.02P1 + 2.0 & l2(30) = 2.84 $/MWh.