Analysis of the Revised Cross-State Air Pollution Rule Update

On March 15, 2021, EPA finalized the Revised Cross-State Air Pollution Rule Update. EPA's power sector analysis for this proposal uses EPA's Power Sector Modeling Platform v6 using IPM.

Documentation for the EPA's Power Sector Modeling Platform v6 using IPM:

For the power-sector analysis of the Revised CSAPR Update, the EPA relied on the January 2020 reference case as the starting platform for its assessment of the Revised CSAPR Update

Below are the versions of the National Energy Electric Data System (NEEDS) used for the final modeling for the Revised CSAPR Update, as well as a link to the most recent version used in some of EPA’s Rule analysis. A link to the IPM v.6 documentation is also included. Versions of NEEDS and IPM documentation used in the Air Quality Modeling Base Case and Illustrative Base Case can also be found in the docket for this rule.

NEEDS v6 rev: 12-16-2020
NEEDS v6 rev: 10-05-2020
NEEDS v6 rev: 1-8-2020
NEEDS v6 rev: 6-30-2020 (Utilized in engineering analytics to capture updated EGU retirement status)
EPA's IPM v6 January 2020 Reference Case Incremental Documentation
EPA's IPM v6 November 2018 Reference Case Documentation (this documentation combined with the above incremental documentation reflects the full suite of documentation pertaining to EPA’s IPM v6 January 2020 model)

IPM Run Files

Download IPM run files for the Revised CSAPR Update using the links in the table below. Click on the IPM run name in the first column of the table below to download a file. The files are posted in one of two formats, a zipped archive or an excel spreadsheet, and contain detailed IPM input and output files (i.e., .DAT, System Summary Report, .RPE, and RPT files) for the listed runs. Review the guide of IPM input and output files.

More detailed information on the modeling framework, specific scenarios, assumptions, and other important details of the analysis can be found in the Regulatory Impact Analysis that accompanies the Revised CSAPR Update.

IPM Run Name	IPM Run Description
Air Quality Modeling Base Case (zip)	Base case model run, including the national Title IV SO₂ cap and trade program; Mercury and Air Toxics Standards (MATS); the Cross-State Air Pollution Rule; the Affordable Clean Energy (ACE) Rule; and settlements and state through January 2020 impacting SO₂, NO_X, directly emitted PM and CO₂. Used for Step 1 and Step 2 analysis.
Illustrative Base Case (zip)	Base case model run, including the national Title IV SO₂ cap and trade program; Mercury and Air Toxics Standards (MATS); the Cross-State Air Pollution Rule (CSAPR); the Affordable Clean Energy (ACE) Rule; and settlements and state rules through January 2020 impacting SO₂, NOX, directly emitting PM and CO₂.Used for Step 3 analysis.
Final Policy Scenario (zip)	This run assumes the emission control levels in upwind states at the stringency level considered in the final Revised Cross-State Air Pollution Rule, to inform air quality modeling projections and the RIA benefit-cost analysis.