System Operator - Transmission Owner Code (STC)
Welcome to the System Operator - Transmission Owner Code (STC) Website. The SO-TO Code was activated on the BETTA Go-Active Date (1 September 2004). The STC Code defines the high-level relationship between the GB System Operator and the Transmission Owners. It is supported by a number of procedures (SOTO Code Procedures or STCPs) that will set out in greater detail the roles, responsibilities, obligations and rights etc of the GBSO and the TOs.
Information relating to all aspects of the STC will be accessible on this site as they are developed, including STC Procedures (STCPs) and documents relating to proposed amendments to the STC. Information regarding the STC and STCP amendment process is contained within section B of the STC (Governance).
Framework & Table of Contents
Sections
Section A - Applicability of Sections and Code Structure v3
Section B - Governance v7
Section C - Transmission Services and Operations v4
Section D - Planning Co-ordination v4
Section E - Payments and Billing v3
Section F - Communications and Data v3
Section G - General Provisions v3
Section H - Dispute Resolution v4
Section I - Transition v3
Section J - Interpretation and Definitions v7
Section K – Technical Design & Operational Criteria & Performance Requirements for Offshore Transmission Systems v5
Schedules
Schedule 1 - Code Accession Agreement v3
Schedule 2 - List of Code Procedures v11
Schedule 3 - Information and Data Exchange Specification v5
Schedule 4 - Criteria for Assessing Those Transmission Systems Affected by a Construction Project v3
Schedule 5 - NGET Connection Application v4
Schedule 6 - NGET Modification Applications v4
Schedule 7 - System Construction Applications v4
Schedule 8 - TO Construction Offers v4
Schedule 9 - TO Construction Terms v4
Schedule 10 - Charges v3.1
Schedule 11 - TEC Exchange Rate Applications v3
Schedule 12 - TO TEC Exchange Rates v3
Schedule 13 - NGET Requests for Statement of Works v4
Schedule A - List of parties
Schedule 15 – Transmission Interface Agreement v1
Procedures
STCP01-1 - Operational Switching
STCP02-1 - Alarm and Event Management
STCP03-1 - Post Event Analysis and Reporting
STCP04-1 - Real Time Data Change Management
STCP04-2 - Real Time Datalink Management
STCP04-3 - Real Time Data Provision
STCP04-4 - Provision of Asset Operational Information
STCP04-5 - Operational Telephony
STCP04-6 - Offshore Datalink Functional Specification for Telecontrol Communications Interface
STCP06-2 - De-synchronised Island Management
STCP06-3 - System Incident Management
STCP06-4 - Contingency Arrangements
STCP08-1 - Protection Testing
STCP08-2 - Circuit Live Trip & DAR Tests
STCP08-3 - Operation Tests and System Tests
STCP09-1 - Safety Co-ordination between Parties
STCP09-2 - Site Public and Environmental Safety
STCP10-1 - Asset Nomenclature
STCP11-1 - Outage Planning
STCP11-2 - Outage Data Exchange
STCP11-3 - TO Outage Change Costing
STCP12-1 - Data Exchange Mechanism
STCP13-1 - Invoicing and Payment
STCP14-1 - Data Exchange for Charge Setting
STCP14-2 - Data Exchange for Charging Consultations
STCP14-3 - Customer Charging Enquiries
STCP16-1 - Investment Planning
STCP17-1 - Feasibility Study
STCP18-1 - Connection and Modification Application
STCP18-2 - Use of System Application
STCP18-4 - Request for a Statement of Works
STCP18-6 - Variations to Agreements
STCP19-2 - Construction Process and Scheme Closure
STCP19-3 - Operational Notification and Compliance Testing
STCP19-4 - Commissioning and Decommissioning
STCP19-5 - Offshore Transmission System Compliance Process & Testing
STCP19-6 - Application Fee
STCP20-1 - Seven Year Statement
STCP21-1 - Offshore Development Information Statement
STCP22-1 - Production of Models for GB System Planning
STCP23-1 Offshore Party Entry Process
Usage of Code Effective Date
Effective Date - Published Version
Disclaimer- Please note that this information is for reference purposes only. It does not in any way form part of the official STC Code. Please e-mail STCTeam@uk.ngrid.com with any queries.
Many of the files available to download on this page are Acrobat PDF files. To access these you will need Acrobat Reader which is available from the Adobe web site.