G/TBT/N/USA/1459/Add.1  
 
14 January 2021  
(21-0449) Page: 1/2 
Committee on Technical Barriers to Trade  Original: English  
 
NOTIFICATION  
Addendum  
The following communication , dated  14 January 2021 , is being circulated at the request of the 
delegation of the United States of America . 
 
_______________  
 
 
Title: Review of Standards of Performance for Greenhouse Gas Emissions From New, Modified, and 
Reconstructed Stationary Sources: Electric Utility Generating Units  
 
Reason for Addendum:  
[  ] Comment period changed - date:   
[  ] Notified measure adopted - date:  
[X] Notified measure published - date: 13 January 2021  
[X] Notified measure enters into force - date: 15 March 2021  
[X] Text of final measure available from1:  
https://www. govinfo.gov/content/pkg/FR -2021-01-13/html/2021 -00389.htm  
https://www.govinfo.gov/content/pkg/FR -2021-01-13/pdf/2021 -00389.pdf  
https://members.wto.org/crnattachments/2021/TBT/USA/final_measure/21_0435_00_
e.pdf 
[  ] Notified measure withdrawn or revoked - date:  
Relevant symbol if measure re -notified:   
[  ] Content or scope of notified measure changed  
New deadline for comments (i f applicable):   
[  ] Interpretive guidance issued and text available from1:  
[  ] Other:  
 
Description:  TITLE: Pollutant -Specific Significant Contribution Finding for Greenhouse Gas 
Emissions From New, Modified, and Reconstructed Stationary Sources: Electric Utility Generating 
Units, and Process for Determining Significance of Other New Source Performance S tandards Source 
Categories  
AGENCY: Environmental Protection Agency (EPA)  
ACTION: Final rule  
SUMMARY: In this final action, the U.S. Environmental Protection Agency (EPA) is finalizing a 
significant contribution finding (SCF) for purposes of regulating sour ce categories for greenhouse 
gas (GHG) emissions, under section 111(b) of the Clean Air Act (CAA) for electric generating units 
 
1 This information can be provided by including a website address, a pdf attachment, or other 
information on where the text of the final measure and/or interpretive guidance can be obtained.  G/TBT/N/USA/1459/Add.1  
 
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  (EGUs), and in doing so, reaffirming that EGUs remain a listed source category. The EPA has reached 
that conclusion by articulat ing a framework under which source categories are considered to 
contribute significantly to dangerous air pollution due to their GHG emissions if the amount of those 
emissions exceeds 3 percent of total U.S. GHG emissions. The EPA is applying the 3 -percent  
threshold to the EGU source category to demonstrate that GHG emissions from the EGU source 
category would contribute significantly to dangerous air pollution. While EGU GHG emissions exceed 
this threshold by a sufficient magnitude to warrant an SCF withou t more ado, the EPA has also, for 
completeness, analyzed EGU emissions under a secondary criteria framework, which also 
demonstrates the propriety of the SCF.  
This final rule and the proposed rule notified as G/TBT/N/USA/1459  are identified by Docket Number 
EPA-HQ-OAR-2013-0495. T he Docket Folder is available on Regulations.gov at 
https://www.regulations.gov/docket?D=EPA -HQ-OAR-2013-0495 and provides access to primary 
and supporting documents as w ell as comments received. Documents are also accessible from 
Regulations.gov  by searching the Docket Number.  
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