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These procedures relate to Flow Weighted Average Calorific Value (FWACV) at GDN Biomethane Entry Points. This note is intended for biomethane operators to advise on the correct procedure for the exchange of gas calibration bottle, both the daily and Ofgem test gases attached to the Ofgem Official CVDD unit.

This document has been put together to summarise work done during early 2021 via the ENA Entry Customer Forum (ENCF) to review processes associated with Calorific Value (CV) target setting and monitoring for Gas Distribution Network (GDN) connected biomethane sites.

The Service Level Agreements (SLAs) have been agreed by Cadent, NGN, SGN and WWU.