EPA Base Case v.4.10 includes a major update of emission control
technology assumptions. For this base case EPA contracted with engineering firm
Sargent and Lundy to perform a complete bottom-up
engineering reassessment of the cost and performance assumptions for sulfur
dioxide (SO2) and nitrogen oxides (NOX) emission controls. In addition to the
work by Sargent and Lundy, Base Case v.4.10 includes two Activated Carbon
Injections (ACI) options (Standard and Modified) for mercury (Hg) control.
Capture and storage options for carbon dioxide (CO2) have also been added in
the new base case. These emission control options are listed in Table 1. They
are available in EPA Base Case v.4.10 for meeting existing and potential
federal, regional, and state emission limits. It is important to note that,
besides the emission control options shown in Table 5-1 and described in this chapter,
EPA Base Case v.4.10 offers other compliance options for meeting emission
limits. These include fuel switching, adjustments in the dispatching of
electric generating units, and the option to retire a unit.
Table 1. Summary of Emission Control Technology Retrofit Options
in EPA Base Case v.4.10
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