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arbcombo -- CA-GREET 2.0 and OPGEE v.1.1 posted for feedback

Posted: 10 Oct 2014 17:23:13
California Air Resources Board staff has posted for public
feedback both a preliminary draft of version 2.0 of the
California-modified Greenhouse Gases, Regulated Emissions, and
Energy Use in Transportation (CA-GREET) model, and Version 1.1,
Draft D of the Oil Production Greenhouse gas Emissions Estimator
(OPGEE). The Low Carbon Fuel Standard regulation order staff will
propose to the Board in February, 2015 will designate a
subsequent draft of GREET 2.0 as the model that must be used to
calculate direct fuel pathway carbon intensities (CIs).  Staff
will propose that version 2.0 replace version 1.8b of the model,
which is currently used for this purpose.
Preliminary fuel pathway CI results from an earlier draft of
CA-GREET 2.0 were presented at an LCFS public workshop held on
August 22, 2014.  During that workshop, staff committed to
posting a more complete draft of the model for public review
within one-to-two months.  This posting fulfills that
commitment.
Feedback on this draft of the CA-GREET model, and on the two
other items included in this posting (described below) will be
accepted between October 10th and October 24th.  Although
development of the CA-GREET 2.0 model is now well advanced,
development efforts will continue during the feedback period. 
The specific goals of this ongoing development are described in
the document with the file name, “Comparison of CA-GREET 1.8b,
GREET1 2013, and CA-GREET 2.0.PDF“ which has also been made
available in this posting.  This file carefully documents the
decisions that went into the development of the draft of the
model posted today, as well as known outstanding issues.  
CA-GREET 2.0 is based on GREET1 2013 from Argonne National
Laboratory.  The changes made to GREET1 2013 were made in close
consultation with staff at Argonne.  That consultation, along
with the feedback received from this posting, and staff’s ongoing
development work, will culminate in the posting of a final draft
of the CA-GREET 2.0 model at the beginning of the 45-day comment
period leading up to the February Board hearing.
The final CA-GREET-related item posted for feedback is the
spreadsheet staff used to calculate the CI of California
reformulated gasoline (CaRFG).  The CIs of California
reformulated blendstock for oxygenate blending (CARBOB) and
California ultra-low sulfur diesel (ULSD) are calculated much
like any other fuel in CA-GREET 2.0.  Calculating the CI of
CaRFG, however, is more complicated.  The CIs of the ethanol
blendstock (itself a blend of ethanols with various CIs), the
CARBOB, and the denaturant in the ethanol must all be properly
accounted for.  
All three CA-GREET-related items posted for feedback—CA-GREET
2.0, the file documenting the changes made to GREET1 2013, and
staff’s CaRFG calculator—are available here:
http://www.arb.ca.gov/fuels/lcfs/ca-greet/ca-greet.htm 

Staff has also posted for public feedback the Oil Production
Greenhouse gas Emissions Estimator (OPGEE) Version 1.1 Draft D
and model documentation at the LCFS Crude Oil Lifecycle
Assessment webpage
(http://www.arb.ca.gov/fuels/lcfs/crude-oil/crude-oil.htm). 
Model changes are briefly discussed in Appendix E of the
documentation.  Feedback on the OPGEE model will be accepted
between October 10th and October 24th and should be emailed to
John Courtis (jcourtis@arb.ca.gov) and James Duffy
(jduffy@arb.ca.gov). 



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