California Air Resources Board

The California Air Resources Board (CARB) will host a public workshop to discuss draft version 3.0a of the Oil Production Greenhouse Gas Emissions Estimator (OPGEE) model. Per section 95489 of the Low Carbon Fuel Standard regulation, revisions to OPGEE are considered on a three-year cycle, and may be incorporated as part of a future regulatory update. The workshop will provide an overview of model revisions and comparisons of resulting carbon intensity (CI) values between the current (version 2.0c) and draft (version 3.0a) versions of OPGEE.

The workshop will be held via Zoom at the following date and time:

Date: Tuesday, August 10, 2021
Time: 9:00 a.m. – 10:30 a.m. (Pacific Time)

Workshop registration

The agenda, OPGEE model and supporting documentation, and presentation slides will be available at the link below prior to the workshop.

More information

CARB is accepting public comments starting at the time of the workshop through 5:00 p.m. on Wednesday, August 25, 2021 at the link below.

Submit comment

Background

Stanford University developed and periodically updates the OPGEE model under contract with CARB. The model uses operational and characteristic data from oil and gas fields to estimate the carbon intensity of exploration, production, processing, and transport of crude oil and, in the revised version, natural gas. In October 2020, CARB held a workshop in which model developer Dr. Adam Brandt presented the major revisions to the model, including changes to the model structure, new venting and fugitive emissions modeling, and expanded coverage of the natural gas supply chain. The purpose of this workshop is to describe changes to CI values between the current (2.0c) and draft (3.0a) versions, including the underlying mechanisms for those changes, and to solicit public feedback.

CARB has mainly used the OPGEE model to estimate crude oil carbon intensity values for the Low Carbon Fuel Standard (LCFS) regulation.

Contacts

If you have questions regarding this workshop, please contact Quinn Langfitt, Air Resources Engineer, Program Assessment Section.