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Revision History

This page describes the revisions and updates made to the Greenhouse Gas Equivalencies Calculator since it was originally posted on EPA’s website in February 2008.

April 16, 2014

The eGRID national average non-baseload emissions factor per kWh of electricity was updated based on final published data. The previous factor used in the calculator was 6.89276 x 10-4 metric tons of CO2 per kWh; the new value is 6.89551 x 10-4 metric tons of CO2 per kWh.

Based on the updated eGRID value above, the equivalency for wind turbines was updated from 3,631 metric tons of CO2 avoided per wind turbine to 3,633 metric tons.

March 21, 2014

The calculator now uses global warming potentials (GWPs) from the Intergovernmental Panel on Climate Change’s Fourth Assessment Report (AR4). Previously it used GWPs from the Second Assessment Report (SAR).

A table showing the previous GWPs from the SAR and the new ones from AR4 is provided below.

100 Year GWPs

Gas SAR
GWP
AR4
GWP
CO2 1 1
CH4 21 25
N2O 310 298
HFC-23 11700 14800
HFC-32 650 675
HFC-125 2800 3500
HFC-134a 1300 1430
HFC-143a 3800 4470
HFC-152a 140 124
HFC-227ea 2900 3220
HFC-236fa 6300 9810
HFC-43-10mee 1300 1640
SF6 23900 22800
CF4 6500 7390
C2F6 9200 12200
C4F10 7000 8860
C6F14 7400 9300
R-404A 3260 3921.6
R-407A 1770 2107
R-407C 1525.5 1773.85
R-410A 1725 2087.5
R-507A 3300 3985

March 12, 2014

Starting Points (using the calculator’s “If You Have Energy Data” tab)

Equivalencies
Note that the data sources for most equivalencies have been updated; only the ones whose emissions factors have changed are described below.

New Equivalencies
EPA added five new equivalencies to the calculator:

December 11, 2013

September 17, 2013

April 25, 2013

October 17, 2012

November 1, 2011

May 20, 2011

April 29, 2011

February 28, 2011

March 8, 2010

November 20, 2009

February 17, 2009

December 8, 2008


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