  A new probabilistic methodology for transmission expansion planning (TEP)
that does not require a priori specification of new/additional transmission
capacities and uses the concept of social welfare has been proposed. Two new
concepts have been introduced in this paper: (i) roulette wheel methodology has
been used to calculate the capacity of new transmission lines and (ii) load
flow analysis has been used to calculate expected demand not served (EDNS). The
overall methodology has been implemented on a modified IEEE 5-bus test system.
Simulations show an important result: addition of only new transmission lines
is not sufficient to minimize EDNS.
