Beta submitted a comment on the question posed in Section 3.39 of the Renewables Obligation: DRAFT Fuel Measurement and Sampling Guidance document published in December 2008.
The California Air Resources Board has incorporated ASTM D6866 in its mandatory reporting regulation for greenhouse gas emissions. ASTM D6866 is the standard method for determining carbon-neutral CO2 emissions from general stationary combustion facilities, cement plants, and electric plants.