1. ARB Perspective on Methane Emissions from Oil and Gas Elizabeth Scheehle June 1, 2015

2. Outline Why is it important? What can be done? What are we doing? – California – Life-cycle What research is ARB conducting? What is our plan going forward?

3. Why are Methane Emissions from the Oil and Gas Sector Important? Short Lived Climate Pollutant Strategy Technology Assessment Low Carbon Fuel Standard Governor’s Goal on Home Heating

4. California Methane Emissions - 2013 100 year GWP 20 year GWP

5. National Oil and Gas Emissions and Leakage Leakage estimates vary depending on methodology used. – Generally 1-3% with some outlier estimations LCFS: GREET estimate of 1.15% – Based on EPA emissions adjusted for combustion and distribution http://www.arb.ca.gov/fuels/lcfs/lcfs_meetings/040315presentation.pdf

6. What can be done? Source: Economic Analysis of Methane Emission Reduction Opportunities in the U.S. Onshore Oil and Natural Gas Industries

7. What is ARB doing to reduce Methane Emissions in California Oil and Gas Production, Processing, Storage, and Transmission (Compressor Stations) Working with CPUC on transmission and distribution pipelines But 80-90% of NG and Majority of Crude Oil from Out of State – National Actions Important

8. 8 15% 36% 39% 10% Source: CEC, Energy Almanac, 2014

9. Thoughts on Methane Leakage Emissions to the atmosphere are important, leakage is but one metric to look at this Leakage must be compared on an apples to apples basis and apportioned appropriately Super-emitters are noted in recent studies Recent meta-analysis suggests emissions underestimated, recent bottom-up studies are varied. Research is ongoing and understanding evolving quickly Need additional study to resolve discrepancies.

10. What Research is ARB doing?

11. Research Collaborators Satellite Measurements (700 km) Aerial Measurements (<1 km) Ground-level Measurements NASA CIRPAS JPL NOAA Mobile LBNL Picarro UC Irvine Towers ARB, Caltech LBNL, LLNL Scripps Laboratory Caltech NOAA UC Irvine Remote Sensing Caltech JPL Field Studies UC Berkeley UC Davis Other UCs CEC 11

12. ARB Ongoing Process Complete regulatory processes Continue public process on life-cycle methane from Oil and Gas Encourage national level actions