Eight states blame upwind sources. Agency to revisit emissions
targets. The U.S. Environmental Protection Agency's Sept. 24
rule for 22 eastern states to file plans to reduce nitrogen
oxide... SEVERAL YEARS AGO, ENGINEERS AT AMERICAN ELECTRIC Power
measured the transfer capability or transmission capacity (in
this article we will use the terms interchangeably) between AEP
and Commonwealth Edison. Using traditional methods, they found
that the winter transmission capacity that year was 3,500
megawatts. Then they performed a more exhaustive and nonstandard
analysis. It showed that during the month of January,
transmission capacity actually varied from a low of 1,600 MW
(less than half the nominal amount) to a high of 6,000 MW (70
percent higher than nominal). Why is transmission capacity
random? How is the probability structure of transmission
capacity computed? Why doesn't anybody use random transmission
capacity today? This article will try to answer these questions.
But first, it is important to understand w