System Operator - Transmission Owner Code (STC) Website.
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).
Complete Code & Framework
STC
Section A - Applicability of Sections and Code Structure v2 rev 1
Section B - Governance v2 rev 4
Section C - Transmission Services and Operations v2 rev 4
Section D - Planning Co-ordination v2 rev 6
Section E - Payments and Billing v2 rev 3
Section F - Communications and Data v2 rev 2
Section G - General Provisions v2 rev 3
Section H - Dispute Resolution v2 rev 5
Section I - Transition v2 rev 2
Section J - Interpretation and Definitions v2 rev 9
Schedules
Schedule 1 - Code accession Agreement v2 rev 2
Schedule 2 - List of Code Procedures v2 rev 16
Schedule 3 - Information and Data Exchange Specification v2 rev 5
Schedule 4 - Criteria for Assessing Those Transmission Systems Affected by a Construction Project v2 rev 2
Schedule 5 - NGET Connection Application v2 rev 2
Schedule 6 - NGET Modification Applications v2 rev 3
Schedule 7 - System Construction Applications v2 rev 2
Schedule 8 - TO Construction Offers v2 rev 2
Schedule 9 - TO Construction Terms v2 rev 2
Schedule 10 - Charges v2 rev 2
Schedule 11 - TEC Exchange Rate Applications v2
Schedule 12 - TO TEC Exchange Rates v2
Schedule 13 - NGET Requests for Statement of Works v2
Schedule 14 - Transmission Planning Data v2
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
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 Annual Charging Setting
STCP14-2 - Data Exchange for Charging Consultations
STCP14-3 - Customer Charging Enqueries
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
STCP19-6 - Application Fee
STCP20-1 - Seven Year Statement
STCP22-1 - Production of Models for GB System Planning
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.