The primary purpose of this paper is to stimulate thinking about how t
he existing transmission system flexibililty can be used. New electron
ic controller applications, based on thyristor technology, have helped
to focus on the inherent flexibility in existing transmission systems
. However, over the years, many techniques have been applied to take a
dvantage of existing transmission system flexibility. This discussion
provides examples of how system operation and reliability can be enhan
ced, with conventional equipment,by taking advantage of existing trans
mission system flexibility. Obviously, other examples could be provide
d.