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CONTENTS

  • 1  Introduction
    • 1.1  Purpose
      • 1.1.1  Summary
    • 1.2  Scope
      • 1.2.1  The Scope of this Document
      • 1.2.2  Types of Interface
    • 1.3  NETA Interface Overview
      • 1.3.1  Introduction
      • 1.3.2  The Business Process Level
      • 1.3.3  Logical Message Definition
      • 1.3.4  Physical Message Definition
      • 1.3.5  Data Transfer Protocols
    • 1.4  Summary
    • 1.5  References
      • 1.5.1  BSC Documents
    • 1.6  Abbreviations
  • 2  Common Interface Conventions
    • 2.1  Interface Mechanisms
      • 2.1.1  Manual
      • 2.1.2  Electronic Data File Transfer
      • 2.1.3  Meter System Interface
      • 2.1.4  BMRA Publishing Interface
    • 2.2  Data File Format
      • 2.2.1  File Header
      • 2.2.2  File Footer
      • 2.2.3  Record Formats
      • 2.2.4  File Types, Record Types and Repeating Structure
      • 2.2.5  File names
      • 2.2.6  Unstructured File Format
      • 2.2.7  Response Messages
      • 2.2.8  Use of Sequence Numbers
      • 2.2.9  Time
      • 2.2.10  The CRA Encryption Key
      • 2.2.11  Valid Sets
      • 2.2.12  Example File Formats
  • 3  External Interface Summary
    • 3.1  Interfaces by BSC Agent
      • 3.1.1  BMRA Interfaces
      • 3.1.2  CDCA Interfaces
      • 3.1.3  CRA Interfaces
      • 3.1.4  ECVAA Interfaces
      • 3.1.5  SAA Interfaces
      • 3.1.6  SVAA Interfaces
    • 3.2  Interfaces by Corresponding Party
      • 3.2.1  BSC Party Interfaces
      • 3.2.2  BSC Party Agent Interfaces
      • 3.2.3  Market Index Data Provider Interfaces
  • 4  BMRA External Inputs and Outputs
    • 4.1  BMRA-I004: (output) Publish Balancing Mechanism Data
      • 4.1.1  Gate Closure Data
      • 4.1.2  Acceptance and Balancing Services Data
      • 4.1.3  Declaration Data
    • 4.2  BMRA-I005: (output) Publish System Related Data
    • 4.3  BMRA-I006: (output) Publish Derived Data
      • 4.3.1  Indicative System Price Stack Data
    • 4.4  BMRA-I019: (output) Publish Credit Default Notices
    • 4.5  BMRA-I010: (output) BMRA Data Exception Reports
    • 4.6  BMRA-I015: (input) Receive Market Index Data
    • 4.7  BMRA-I028: (input) Receive REMIT Data
    • 4.8  BMRA-I030: (output) Publish REMIT Data
    • 4.9  BMRA-I031: (output) Publish Transparency Regulation Data
    • 4.10  BMRA-I035: (output) Publish Trading Unit Data
    • 4.11  BMRA-I037: (output) Publish Replacement Reserve Data
    • 4.12  BMRA-I038: (input) Receive Regional Demand Forecast and Restoration Data
    • 4.13  BMRA-I039: (output) Publish Regional Demand Forecast and Restoration Data
    • 4.14  BMRA-I039: (output) Publish Exempt Supply Volume Data
    • 4.15  BMRA TIBCO Message Publishing - Data Formats
      • 4.15.1  Message Types
      • 4.15.2  Message Subject Naming
      • 4.15.3  Message Formats
      • 4.15.4  Field Type Definitions
      • 4.15.5  Message Definitions
      • 4.15.6  Format of Data within TIB Messages
      • 4.15.7  Writing an Application that Subscribes to TIB Messages
    • 4.16  NOT USED
  • 5  CDCA External Inputs and Outputs
    • 5.1  CDCA Flow Overview
    • 5.2  CDCA-I001: (input) Aggregation rules
    • 5.3  CDCA-I003: (input) Meter technical data
    • 5.4  CDCA-I004: (output) Notify New Meter Protocol
    • 5.5  CDCA-I005: (input) Load New Meter Protocol
    • 5.6  CDCA-I006: (output) Meter Data for Proving Test
    • 5.7  CDCA-I007: (output) Proving Test Report/Exceptions
    • 5.8  CDCA-I008: (input) Obtain metered data from metering systems
    • 5.9  CDCA-I009: (input) Meter Period Data Collected via Site Visit
    • 5.10  CDCA-I010: (output) Exception report for missing and invalid meter period data
    • 5.11  CDCA-I011: (input) Dial Readings from meter, for MAR
    • 5.12  CDCA-I012: (output) Report Raw meter Data
    • 5.13  CDCA-I013: (input) Response to Estimated data
    • 5.14  CDCA-I014: (output) Estimated Data Report
    • 5.15  CDCA-I015: (input) Reporting metering system faults
    • 5.16  CDCA-I017: (output) Meter Reading Schedule for MAR
    • 5.17  CDCA-I018: (output) MAR Reconciliation Report
    • 5.18  CDCA-I019: (output) MAR Remedial Action Report
    • 5.19  CDCA-I021: (input) Notification of Metering Equipment Work
    • 5.20  CDCA-I022: (input) Distribution Line Loss Factors
    • 5.21  CDCA-I023: (output) Missing Line Loss Factors
    • 5.22  CDCA-I025: (output) Aggregation Rules Exceptions
    • 5.23  CDCA-I026: (output) Aggregated Meter Volume Exceptions
    • 5.24  CDCA-I029: (output) Aggregated GSP Group Take Volumes
    • 5.25  CDCA-I030: (output) Meter Period Data for Distribution Area
    • 5.26  CDCA-I033: File Receipt Acknowledgement
    • 5.27  CDCA-I037: (output) Estimated Data Notification
    • 5.28  CDCA-I038: (output) Reporting metering system faults
    • 5.29  CDCA-I041: (output) Interconnector Aggregation Report
    • 5.30  CDCA-I042: (output) BM Unit Aggregation Report
    • 5.31  CDCA-I044: (input) Meter System Proving Validation
    • 5.32  CDCA-I045: (input) Meter Data from routine work and Metering Faults
    • 5.33  CDCA-I046: (output) Site Visit Inspection Report
    • 5.34  CDCA-I047: (output) Correspondence Receipt Acknowledgement
    • 5.35  CDCA-I048: (output) Report of Aggregation Rules
    • 5.36  CDCA-I051: (output) Report Meter Technical Details
    • 5.37  CDCA-I054:(output) Meter Status Report
    • 5.38  CDCA-I055: (input) Transfer from SMRS information
    • 5.39  CDCA-I057: (input) Transfer to SMRS information
    • 5.40  CDCA-I059: (output) Initial Meter Reading Report
    • 5.41  CDCA-I060: (input) SVA Party Agent Details
    • 5.42  CDCA-I067: (input) Disconnected BM Units
  • 6  CRA External Inputs and Outputs
    • 6.1  CRA Flow Overview
    • 6.2  CRA-I001: (input) BSC Party Registration Data
    • 6.3  CRA-I002: (input) Interconnector Administrator Registration Data
    • 6.4  CRA-I003: (input) BSC Party Agent Registration Data
    • 6.5  CRA-I005: (input) BM Unit Registration Data
    • 6.6  CRA-I006: (input) Trading Unit Registration
    • 6.7  CRA-I007: (input/output) Boundary Point and System Connection Point Data
    • 6.8  CRA-I008: (input) Interconnector Registration Details
    • 6.9  CRA-I012: (output) CRA Encryption Key
    • 6.10  CRA-I014: (output) Registration Report
    • 6.11  CRA-I021: (output) Registered Service List
    • 6.12  CRA-I024: (output) Certification and Accreditation Status Report
    • 6.13  CRA-I025: Receive Acknowledgement
    • 6.14  CRA-I026: Issue Acknowledgement
    • 6.15  CRA-I027: (input) GSP Group and GSP Registration
    • 6.16  CRA-I031: (input) Metering System Data
    • 6.17  CRA-I034: (input) Flexible Reporting Request
    • 6.18  CRA-I038: Transfer from SMRS information
    • 6.19  CRA-I040: Transfer to SMRS information
    • 6.20  CRA-I048: GC or DC Breach Notification
    • 6.21  CRA-I049: GC or DC Breach Estimation Challenge
    • 6.22  CRA-I051: Notification of Breach Challenge Data
  • 7  ECVAA External Inputs and Outputs
    • 7.1  ECVAA Flow Overview
    • 7.2  ECVAA-I002: (input) ECVNAA Data
    • 7.3  ECVAA-I003: (input) MVRNAA Data
    • 7.4  ECVAA-I004: (input) ECVN
    • 7.5  ECVAA-I005: (input) MVRN
    • 7.6  ECVAA-I007: (output) ECVNAA Feedback
    • 7.7  ECVAA-I008: (output) MVRNAA Feedback
    • 7.8  ECVAA-I009: (output) ECVN Feedback (Rejection)
    • 7.9  ECVAA-I010: (output) MVRN Feedback (Rejection)
    • 7.10  ECVAA-I013: (output) Authorisation Report
    • 7.11  ECVAA-I014: (output) Notification Report
    • 7.12  ECVAA-I018: Receive Acknowledgement
    • 7.13  ECVAA-I019: Issue Acknowledgement
    • 7.14  ECVAA-I022: (output) Forward Contract Report
    • 7.15  ECVAA-I024: (input) Credit Cover Minimum Eligible Amount Request
    • 7.16  ECVAA-I025: (output) Credit Cover Minimum Eligible Amount Report
    • 7.17  ECVAA-I028: (output) ECVN Acceptance Feedback
    • 7.18  ECVAA-I029: (output) MVRN Acceptance Feedback
    • 7.19  Forward Contract Report Start Period Override
    • 7.20  ECVAA-I021: (output) Credit Limit Warning
    • 7.21  ECVAA-I037: (input) Receive Volume Notification Nullification Request
    • 7.22  ECVAA-I038: (output) Issue Volume Notification Nullification Confirmation Report
    • 7.23  ECVAA-I039: (output) Issue Nullification Completion Report
    • 7.24  Additional Clarification on ECVAA Interfaces
      • 7.24.1  Sign Convention
      • 7.24.2  Notes on functionality
      • 7.24.3  Notes on Notification Processing and Reporting
    • 7.25  ECVAA-I042: Banning/Unbannimg Individual User Access to the ECVAA Web Service
    • 7.26  ECVAA-I043: ECVAA Web Service – BSC Party View ECVNs
    • 7.27  ECVAA-I044: ECVAA Web Service – BSC Party View MVRNs
    • 7.28  7ECVAA-I045: ECVAA Web Service – ECVNA View ECVNs.
    • 7.29  ECVAA-I046: ECVAA Web Service – MVRNA View MVRNs.
    • 7.30  ECVAA-I051: Wholesale Market Activity Notification
    • 7.31  ECVAA-I052: Wholesale Market Activity Notification Exception Report
  • 8  SAA External Inputs and Outputs
    • 8.1  SAA Flow Overview
    • 8.2  SAA-I006: (input) BM Unit Metered Volumes for Interconnector Users
    • 8.3  SAA-I012: (input) Dispute Notification
    • 8.4  SAA-I014: (output) Settlement Reports
      • 8.4.1  Aggregate Party Day Charges
      • 8.4.2  Aggregate VLP Day Charges[22]
      • 8.4.3  Aggregate Party Period Charges
      • 8.4.4  Aggregate VLP Period Charges[23]
      • 8.4.5  System Period Data
      • 8.4.6  VLP[24] System Period Data
      • 8.4.7  System Quarter Hour Data (following the TERRE P344 Final Implementation Date)
      • 8.4.8  Account Period Data
      • 8.4.9  Virtual Balancing Account Period Data
      • 8.4.10  Account Period BMU Data
      • 8.4.11  BM Unit Period Data
      • 8.4.12  Secondary BM Unit Period Data
      • 8.4.13  BM Unit Period RR Data
      • 8.4.14  BM Unit Quarter Hour RR Data
      • 8.4.15  Replacement Reserve Bid
      • 8.4.16  RR Auction Period
      • 8.4.17  RR Auction Point
      • 8.4.18  RR Activation
      • 8.4.19  RR Activation Point
      • 8.4.20  Bid-Offer Data
      • 8.4.21  MVR Data
      • 8.4.22  Market Index Data
      • 8.4.23  Balancing Services Adjustment Action Data
      • 8.4.24  BM Unit Bid-Offer Pair Acceptance Volume Data
    • 8.5  SAA-I016: (output) Settlement Calendar
    • 8.6  SAA-I017: (output) SAA Data Exception Report
    • 8.7  SAA-I018: (output) Dispute Reports
    • 8.8  SAA-I021: Receive Acknowledgement of SAA Messages
    • 8.9  SAA-I022: Issue SAA Acknowledgement of Messages
    • 8.10  SAA-I030: (input) Receive Market Index Data
    • 8.11  SAA-I058: (output) Aggregated Non-Chargeable Demand Report
    • 8.12  SAA-I061: (input) BM Unit Eligible Exempt Supply
    • 8.13  SAA-I063: (input) Secondary BM Unit Asset Demand and Delivered Volumes
  • 9  SVAA External Inputs and Outputs
    • 9.1  P0282: Delivered Volume Notification
    • 9.2  P0283: Rejection of Delivered Volume Notification
    • 9.3  P0284: Confirmation of Delivered Volume
    • 9.4  P0285: Delivered Volume Exception Report
    • 9.5  P0287: Metering System Half Hourly Volume Adjustments
    • 9.6  P0288: Secondary Half Hourly Consumption Volumes
    • 9.7  P0297: Asset Registration
    • 9.8  P0298: Rejection of Asset Registration
    • 9.9  P0299: Confirmation of Asset Registration
    • 9.10  P0300: Registration of Asset Metering Agents
    • 9.11  P0301: Rejection of Asset Metering Agents
    • 9.12  P0302: Confirmation of Registration of Asset Metering Agents
    • 9.13  P0303: Asset Meter Registration
    • 9.14  P0304: Rejection of Asset Meter Registration
    • 9.15  P0305: Confirmation of Asset Meter Registration
    • 9.16  P0306: AMSID Pair Allocation to a Secondary BM Unit
    • 9.17  P0307: Confirmation of AMSID Pair Allocation to a Secondary BM Unit
    • 9.18  P0308: Rejection of AMSID Pair Allocation to a Secondary BM Unit
    • 9.19  P0309: Notification of use of AMSID Pair by another AMVLP
    • 9.20  P0310: Missing Metering System Data
    • 9.21  P0311: Invalid Metering System Data
    • 9.22  P0320: Loss of AMSID Pair Allocation
    • 9.23  P0323: BM Unit Allocation Event Day
    • 9.24  P0324: Rejection of BM Unit Allocation Event Day
    • 9.25  P0325: Confirmation of BM Unit Allocation Event Day
    • 9.26  P0326: BM Unit Allocation Baselining Detail
    • 9.27  P0327: Rejection of BM Unit Allocation Baselining Detail
    • 9.28  P0334: Confirmation of BM Unit Allocation Baselining Detail
    • 9.29  P0328: BM Unit Submitted Expected Volume Notification
    • 9.30  P0329: BM Unit Submitted Expected Volume Rejection
    • 9.31  P0330: BM Unit Submitted Expected Volume Acceptance
    • 9.32  P0331: BM Unit Submitted Expected Volume Warning
    • 9.33  P0333: Baselining Expected Volume Report
    • 9.34  P0335: BM Unit Baselining Status
    • 9.35  P0336: Rejection of BM Unit Baselining Status
    • 9.36  P0337: Confirmation of BM Unit Baselining Status
    • 9.37  P0342: Metering System Non-Final Non-Chargeable Demand Volumes

NETA Interface Definition and Design Document Part 1 – Interfaces with BSC Parties and their Agents V64.0

Effective From Date:25/06/2026
Status:LIVE
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