1. Energy Networks Association Flow Weighted Average Calorific Value Options Biomethane Campaign Working Group 7 th August 2014 The Voice of the Networks

2. 2 Current Arrangements BEU RTUDNCC GNCC ΣFWAC “Energy management team” (manage the FWACV process) GCoTE GSMR Only volume volume CV + vol separate due to the limitations on historical protocol (modbus) CV DD Meter Controller 2551 FCFC PC DANINTHPMIS EOD File Approved device - LoA Meter not under LoA but interpretation of TER is requisite (% accuracy) DANINT interfaces with CV DD and meter to collect data Approved software under LoA DATA XOSERVE CV volume CalibrationGases

3. 3 The Voice of the Networks Propose that sites less than a specified threshold input (10,000 scmh) are not directed sites NEA specifies CV device accuracy and calibration – managed in the same manner as GS(M)R Removes the requirement for Approved devices and software Agree accuracy class of CV measurement device and calibration regime – could ENA lead on defining this? Customer still propanates to meet FWACV value supplied by DN (and if CV is too low, no flow allowed) Low Flow Sites Not Directed RTU DNCC Customer PLC CV DD Meter This option reduces costs, complexity and is simple to implement Will also facilitate new entrants and innovation in the Grid Entry Unit market Customers are protected as FWACV is targeted by the Operator – governed by NEA with Ofgem oversight GNCC CV and volume follows identical route managed by Customers ‘Flow Computer

4. 4 The Voice of the Networks GCoTE would require that an approved software is still used GCoTE also stipulate that the calculations must be carried out on site Subject to agreement to amend GCoTE would still require reconciliation at DNCC CVDD is still approved device so would need daily and 35-day test – this is a Gas Act requirement so harder to change Modified Direction RTU DNCC Customer PLC CV DD Meter Significant effort and complexity developing alternative process and infrastructure for minimal benefit Requirements for 35 day test and calibration remain along with Network Capping implications Exactly same local consumer impact as the “Not Directed” option but would incur higher costs DANINT or Equivalent Calibration Gases Approved device - LoA GNCC Approved software - LoA