Ecogra
"In order to further ensure the integrity of the compliance review process and data analysis, eCOGRA has appointed auditors KPMG in London to regularly review the following:
-the people and processes involved in performing the
-assessments and producing reports;
-
the sufficiency of testing performed ;
-the RNG methodology;
-the process followed on a sample of RNG reviews;
-annually the process to conduct payout reconciliation reviews."
It looks like KPMG London are the people to talk to to get your answer.