EnergyNetworksAssociationFlow Weighted Average Calorific Value Options

Biomethane Campaign Working Group 7th August 2014

The Voice of the Networks

2 The Voice of the Networks

Current Arrangements

BEU RTU DNCC GNCC

ΣFWAC“Energy management

team” (manage the FWACV process)

GCoTEGSMR

Only volume volume

CV + vol separate due to the limitations on historical protocol (modbus)

CVDD

Meter

Controller 2551

FC

PC DANINT HPMIS

EOD File

Approved device - LoA

Meter not under LoA but interpretation of TER is requisite (% accuracy)

DANINT interfaces with CVDD and meter to collect dataApproved software under LoA

DATA

XOSERVE

CV

volume

CalibrationGases

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 DNCCCustomerPLC

CVDD

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 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 DNCCCustomerPLC

CVDD

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 EquivalentCalibration Gases

Approved device - LoA

GNCC

Approved software - LoA