Electric utilities around the USA have profound differences in their e
xisting capital stock. These affect the character of regional opportun
ities for reducing pollutant emissions. This paper introduces a simple
system level emissions model and identifies cost-effective pollution
reduction strategies for each region, given choices that include life
extending existing capacity, investing in new technology, and demand-s
ide management. It shows that superior solutions differ across polluta
nts and regions. This implies that policy prescriptions to reduce the
environmental externalities associated with power production should re
cognize existing capacity characteristics in order to be efficient.