  Computer models being developed to understand the interaction between
demand-response technology, power system deregulation and market transformation
depend in part on understanding the relationship between system frequency and
load-control. Frequency, load, and plant outage events data collected over the
last several years have permitted analysis to determine the Western Electricity
Coordination Council (WECC) system's inertia during each event. This data was
used to evaluate the relationship of system inertia to total load, which is
used to model system response to load curtailment programs in next generation
power system simulations.
