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Energy Networks Association

The Voice of the Networks. Energy Networks Association. Flow Weighted Average Calorific Value Options. Biomethane Campaign Working Group 7 th August 2014. Current Arrangements. CV + vol separate due to the limitations on historical protocol ( modbus ). Only volume. volume. RTU.

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Energy Networks Association

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

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

  3. Low FlowSites Not Directed • 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) CV and volume follows identical route managed by Customers ‘Flow Computer CVDD RTU DNCC Customer PLC GNCC 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

  4. Modified Direction • 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 DANINT or Equivalent Approved software - LoA Calibration Gases Approved device - LoA CVDD RTU DNCC GNCC Customer PLC 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

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