Table of Contents v1.15 3 Dec12 CMP206 - National Grid

1 CUSC Table of Contents 1 03 December 2012 National GRID ELECTRICITY TRANSMISSION plc THE CONNECTION & USE OF SYSTEM CODE Table OF Contents INTRODUCTION SECTION 1 - APPLICABILITY OF SECTIONS AND RELATED AGREEMENTS STRUCTURE Introduction Applicability Bilateral Agreements, Construction Agreements and Mandatory Services Agreements Categories of Use Without Bilateral Agreements Bella Application Authority s Right to Determine in Respect of a Bella SECTION 2 - CONNECTION Introduction PART I - GENERAL Being Operational, Connection and Energisation Export of Power from Connection Site Import of Power to Connection Site Maintenance of Assets Outages Special Automatic Facilities Protection and Control Relay Settings / Fault Clearance Times Other Site Specific Technical Conditions Safety Rules CUSC Table of Contents 2 03 December 2012 Interface Agreement Principles of Ownership New Connection Sites PART II - CONNECTION CHARGES Connection Charges Revision of Charges Data Requirements Replacement of Transmission Connection Assets Termination Amounts - Re-Use PART III - CREDIT REQUIREMENTS Security for Termination Amounts Provision of Security for Termination Amounts where User meets Credit Rating Provision of Security for Termination Amounts where User does not meet Credit Rating Types of Security SECTION 3 - USE OF SYSTEM Introduction PART IA.

2 GENERAL - GENERATION Rights to Use the GB Transmission System Other Site Specific Technical Conditions for Embedded Power Stations and Distribution Interconnectors PART IB - GENERAL - SUPPLY Rights to Use the GB Transmission System Supplier Customer Details Suppliers of Non-Embedded Customers Use of System Application Termination Provisions CUSC Table of Contents 3 03 December 2012 PART II - USE OF SYSTEM CHARGES PART IIA - GENERAL Use of System Charges PART IIB - TRANSMISSION NETWORK USE OF SYSTEM CHARGES Data Requirements Variation of Forecasts during the Financial Year Validation of Demand Forecasts Reconciliation Statements Revision of Charges Forecast of Transmission Network Use of System Charges PART IIC - BALANCING SERVICES USE OF SYSTEM CHARGES Introduction Reconciliation [No heading] [No heading] Reconciliation Payments Revision of Charges [No heading] PART III - CREDIT REQUIREMENTS BSUOS Charges and TNUOS Demand Charges.

3 Provision of Security Cover Credit Monitoring Payment Default Utilisation of Funds User s Right to Withdraw Funds User s Allowed Credit Transitional Arrangements CUSC Table of Contents 4 03 December 2012 Appendix 1 Credit Arrangements SECTION 4 - BALANCING SERVICES Mandatory Ancillary Services Maximum Generation Other Balancing Services Payments for Balancing Services Charging Principles Indexation SECTION 5 - EVENTS OF DEFAULT, DEENERGISATION AND DISCONNECTION Duration and Termination Emergency Deenergisation Generic Events of Default and Deenergisation Site Specific Deenergisation and Disconnection Balancing Services Use of System Charges: Events of Default Notice to Disconnect Disconnection Not Used Non-Embedded Customers Relevant Interruptions SECTION 6 - GENERAL PROVISIONS Introduction The Company Obligations Compliance with Grid Code / Distribution Code Joint System Incidents CUSC Table of Contents 5 03 December 2012 Obligations of Users Who Own or Operate Distribution Systems Payment Metering Balancing Mechanism Requirements Modifications General Provisions Concerning Modifications and New Connection Sites Nuclear Installations Limitation of Liability Additional CUSC Parties Transfer and Subcontracting Confidentiality Data Provision of Data Intellectual Property Force Majeure Waiver Notices Third Party Rights

4 Jurisdiction Counterparts Governing Law Severance of Terms Language MCUSA BSC Revision of Transmission Entry Capacity Limited Duration Transmission Entry Capacity CUSC Table of Contents 6 03 December 2012 Change from NGC to The Company Temporary TEC Exchanges Embedded MW Register Transmission Works Register Appendix 1 - Communications Plant Appendix 2 - Operating Metering SECTION 7 - DISPUTE RESOLUTION Introduction Disputes Charging Disputes Other Disputes Third Party Claims SECTION 8 - CUSC MODIFICATION Part A Introduction Part B Code Administrator The CUSC Modifications Panel Appointment of Panel Members Term of Office Removal from Office Alternates Meetings Proceedings at Meetings Quorum Voting CUSC Table of Contents 7 03 December 2012 Protections for Panel Members Part C CUSC Modification Register Progress Report Change Co-ordination CUSC Modification Proposals Significant Code Review CUSC Modification Proposal Evaluation Panel Proceedings Workgroups Standing Groups The Code Administrator Consultation CUSC Modification Report Urgent CUSC Modification Proposals Self-Governance Confidentiality Implementation Annex 8A Election of Users' Panel Members SECTION 9 - INTERCONNECTORS Introduction PART I CONNECTION TO THE GB TRANSMISSION SYSTEM BY INTERCONNECTOR OWNERS Connection Introduction Being Operational, Connection and Energisation Export of Power from the Interconnector Connection Site Import of Power to the Interconnector Connection Site [no heading]

5 CUSC Table of Contents 8 03 December 2012 Maintenance of Transmission Connection Assets Outages Connection Charges Use of System Charges - Transmission Network Use of System Charges Special Automatic Facilities Protection and Control Relay Settings / Fault Clearance Times Other Site Specific Technical Conditions Safety Rules Interface Agreement Principles of Ownership Event of Default New Connection Sites PART II USE OF THE GB TRANSMISSION SYSTEM BY INTERCONNECTOR USERS AND INTERCONNECTOR ERROR ADMINISTRATORS Introduction Rights to Use the GB Transmission System Use of System Application Use of System Charges - Balancing Services Use of System Charges Termination and Related Provisions SECTION 10 - NOT USED, REMOVED ON 15TH FEBRUARY 2007 DEDICATED TO TRANSITIONAL ISSUES SECTION 11 - INTERPRETATION AND DEFINITIONS Introduction Interpretation and Construction Definitions CUSC Table of Contents 9 03 December 2012 SECTION 12 - BETTA TRANSITION ISSUES Introduction GB CUSC Transition Cut-over SECTION 13 - ENABLING WORKS Introduction Enabling Works MITS Map Report SECTION 14 - CHARGING METHODOLOGIES Part I The Statement of the Connection Charging Methodology Part II The Statement of the Use of System Charging Methodology SECTION 15 - USER COMITTMENT METHODOLOGY Part One Introduction Part Two Calculation of Cancellation Charge Part Three Calculation of Cancellation Charge Secured Amount and Credit Requirements Part Four Reconciliation of Actual Attributable Works Cancellation Charge SCHEDULES Schedule 1.

6 List of Users Schedule 2 - Exhibit 1 - Bilateral Connection Agreement Exhibit 2 - Bilateral Embedded Generation Agreement CUSC Table of Contents 10 03 December 2012 Exhibit 3 - Construction Agreement Exhibit 3A - Offshore Construction Agreement Exhibit 4 - Mandatory Services Agreement Exhibit 5 - BELLA Exhibit 6 - Transmission Related Agreement Schedule 3 - Balancing Services Market Mechanisms - Reactive Power EXHIBITS Exhibit A - CUSC Accession Agreement Exhibit B - Connection Application Exhibit C - Connection Offer Exhibit D - Generators etc. Use of System Application Exhibit E - Generators etc. Use of System Offer Exhibit F - Suppliers etc Use of System Application Exhibit G - Use of System Supply Offer and Confirmation Notice Exhibit H - Use of System Interconnector Offer and Confirmation Notice Exhibit I - Modification Application Exhibit J - Modification Offer Exhibit K - Modification Notification Exhibit L - Bi-Annual Estimate for Bilateral Agreement Exhibit M - Secured Amount Statement Exhibit N - Notice of Drawing Exhibit O - Interface Agreements Exhibit P - STTEC Request Form Exhibit Q - BELLA Application CUSC Table of Contents 11 03 December 2012 Exhibit R - BELLA Offer Exhibit S - The Connection and Use of System Code LDTEC Request Form Exhibit T - LDTEC Availability

7 Notification Exhibit U - Request for a Statement of Works User that owns or operates a Distribution System Exhibit W - Temporary TEC Exchange Rate Request Form Exhibit X - Temporary TEC Exchange Notification of Interest Form End of Table of Contents