This page last reviewed March 14, 2013
Potential New Compliance Offset Protocol Rice Cultivation Projects
The potential new Compliance Offset Protocol Rice Cultivation Projects will provide methods for quantifying reductions in methane emissions from flooded rice fields. Methane emissions are a result of anaerobic decomposition caused by the flooding of fields containing organic matter. The organic matter originates from soil amendments, plant residues and root exudates. Methane production is affected by the duration of flooding, the rice variety and the availability of crop residues and organic matter.
All reductions must be fully documented, and accurately quantified. ARB is considering using the DeNitrification-DeComposition (DNDC) biogeochemical process model to quantify changes in N2O and CH4 emissions due to the eligible practices. Projects would be limited to the major rice growing regions in California and the Mid-South (Arkansas, Missouri, Mississippi, Louisiana, and Texas) for which the DNDC model has been calibrated with empirical data. ARB is considering three eligible practices for California: 1) replacing wet seeding with dry seeding, 2) early drainage at the end of growing season, and 3) rice straw removal after harvest; and four eligible practices for the Mid-South: 1) early drainage at the end of growing season, 2) rice straw removal after harvest, 3) intermittent flooding, and 4) staggered winter flooding.
The Offset Project Operator or Authorized Project Designee would be required to use this protocol to quantify and report greenhouse gas (GHG) emission reductions. The protocol would provide eligibility rules, methods to quantify GHG emission reductions, offset project monitoring instructions, and procedures for preparing Offset Project Data Reports. All offset projects would be required to submit to independent verification by ARB-accredited verification bodies. Regulatory requirements for verification of Offset Project Data reports will be provided in the Cap-and-Trade Regulation
This protocol will be designed to ensure the complete, consistent, transparent, accurate, and conservative quantification of GHG emission reductions associated with a Rice Cultivation project. The protocol will be comprised of both quantification methodologies and regulatory program requirements to develop an Rice Cultivation project for generating ARB offset credits.
ARB conducted a workshop on March 28, 2013 discussing protocol requirements, eligibility, and timeframe. Workshop materials can be found at: http://www.arb.ca.gov/cc/capandtrade/meetings/meetings.htm.
Technical Working Group Materials:
4th Technical Working Group Meeting - December 20, 2013
- Supporting Document 1: PBCS Study Interim Report
- Supporting Document 2: Steps for DNDC Calibration and Validation
- Supporting Document 3: References Used for DNDC Calibration, Validation, and Structural Uncertainty Calculation
3rd Technical Working Group Meeting - October 1, 2013
2nd Technical Working Group Meeting - July 19, 2013
August 19, 2013 Workshop Materials:
We have been working diligently with stakeholders and the public to develop an ARB Compliance Offset Protocol to reduce methane emissions from rice cultivation. That process has raised some questions which require more time to address. Work is now underway to resolve these issues, and we expect to bring a Rice Cultivation Project Protocol before the Board by spring 2014.