Point sources.

Section 2 of the EIIP projections document gives details about projection of point-source

emissions. There are two major subsets of point sources: electric generating utilities (EGUs) and

non-EGUs. The Clean Air Markets Division (CAMD) of the U.S. EPA uses the Integrated

Planning Model (IPM) to model emissions trading programs that now dominate the prediction of

future-year emissions from EGUs. More information on IPM is available at

(http://www.epa.gov/airmarkt/epa-ipm/ ). Additionally, IPM-based emissions are posted by

CAMD on EPA’s website (http://www.epa.gov/airmarkets/epa-ipm/iaqr.html). Other trading

models may exist and could be used for estimation of future-year emissions.

To prevent double-counting of emissions sources, emissions modelers who use IPM

should be careful to match the sources of emissions from IPM with the base year emissions

sources. This helps to ensure that the EGU part of their point source inventory is separated from

the non-EGU part based on the facilities included in IPM. The facilities included in IPM are

defined using the National Electric Energy Database System (NEEDS). The NEEDS dataset

should be compared to the point inventory using the Office of Regulatory Information Systems

(ORIS) Plant ID field from both. In some cases (e.g., co-generation facilities), only some of the

units at these facilities are included in IPM; therefore, the separation of EGUs from non-EGUs

should be done by unit and not by facility.

Since base-year emissions of EGU point sources can be based on hour-specific emissions

from the CEM program, emissions modelers must choose a temporal allocation approach for

estimated future-year emissions. Emissions modelers should choose an approach that is

representative of future expected behavior and not limited to any single year’s closures and

maintenance schedule. Ideally, types of EGUs that are run during high demand conditions would

have temporal allocation approaches that reflected those peaks, and units that are run

continuously would be temporally allocated in a more uniform way. Analysis of several years of

 

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