Complete STC 01 April 2026

Complete Connection and Use of System Code Contents Sections Section 01 Applicability of Sections and Related Agreements Section 02 Connection Section 03 Use of System Section 04 Balancing Services Section 05 Events of default, de-energisation, disconnection Section 06 General Provisions Section 07 CUSC Dispute Resolution Section 08 CUSC Modification Section 09 Interconnectors Section 10 Transition Issues Section 11 Interpretation and Definitions Section 12 Not Used Section 13 Enabling Works Section 14 Charging Methodologies Section 15 User Commitment Methodologies Section 16 Queue Management Process Section 17 Application and Offer Process Section 18 Gates Process for Projects with Existing Agreements Schedules Schedule 1 List of Users Schedule 2 Exhibit 1 Bilateral Connection Agreement Schedule 2 Exhibit 1A & Appendix G Agreement to Vary the Bilateral Connection Substation Schedule 2 Exhibit 2 Bilateral Embedded Generation Agreement Schedule 2 Exhibit 3 Construction Agreement Schedule 2 Exhibit 3A Offshore Construction Agreement Schedule 2 Exhibit 4 Mandatory Services Agreement Schedule 2 Exhibit 5 Bilateral Embedded Licence Exemptible Large Power Station Agreement Schedule 2 Exhibit 6 Transmission related Agreements regarding Bid Price Schedule 2 Exhibit 7 Virtual Lead Party Agreement Schedule 3 Balancing Services Exhibits Exhibit A Accession Agreement Exhibit B Connection Application Exhibit C Connection Offer Exhibit D BEGA Application Exhibit E Use of System Offer Exhibit F 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 bilateral agreement Exhibit MM1 Cancellation Charge Statement Exhibit MM2 Cancellation Charge secured amount Exhibit MM3 Notification of Fixed Attributable Works Cancellation Charge Exhibit N Notice of Drawing Exhibit O Part 1B Relevant Transmission Licensee Assets on User Land in Scotland Exhibit O Part 1C Relevant Transmission Licensee Assets on Offshore Platform Exhibit O Part 2B User Assets on Relevant Transmission Licensee Land Exhibit O Part 2C User Assets on RTL Offshore Platform Exhibit P Directly Connected Power Station Exhibit Q Bella Application Embedded Exemptable Power Station Exhibit R Connect to Manage/BELLA Offer Exhibit S LDTEC Request Form Exhibit T LDTEC Availability Notification Exhibit U Request for a Statement of Works Exhibit V Statement of Works Exhibit W Temporary Tec Exchange Rate Request Form Exhibit X Temporary Tec Exchange Notification of Interest Form Exhibit Y EBGL A18 Mapping Table CUSC v1.19 v1.19 10 June 2025 CUSC - SECTION 1 APPLICABILITY OF SECTIONS AND RELATED AGREEMENTS STRUCTURE CONTENTS 1.1 Introduction 1.2 Applicability 1.3 Bilateral Agreements, Construction Agreements and Mandatory Services Agreements 1.4 Connect and Manage Arrangements 1.5 OTSDUW arrangements 1.6 Categories of Use Without Bilateral Agreements 1.7 Bella Application 1.8 Authority’s Right to Determine in Respect of a Bella CUSC v1.19 Page 2 of 12 v1.19 10 June 2025 CUSC - SECTION 1 APPLICABILITY OF SECTIONS AND RELATED AGREEMENTS STRUCTURE 1.1 INTRODUCTION 1.1.1 The Company is obliged by the ESO Licence to maintain the CUSC and to enter into arrangements for connection and use of system with Users pursuant to its terms. 1.1.2 The CUSC is divided into different sections, including sections dealing specifically with Connection to and Use of System, the provision of Balancing Services, Interconnectors and other sections of more general application. 1.1.3 Compliance with the various sections by a User is dependent on the nature of that User’s connection and/or use in any given instance. A User may be party to the CUSC in a number of different categories. 1.1.4 This Section also deals with the requirement for a User to enter into Bilateral Agreements, Construction Agreements and Mandatory Services Agreements. 1.1.5 The CUSC and the proforma Bilateral Agreements set out as Exhibits 1, 2 and 5 of Schedule 2 are drafted to reflect the standard terms in relation to The Company’s charges (an indicative price agreement). Where a User chooses to have a different charging option, where provided for in the Charging Statements current at the time of application for the relevant Bilateral Agreement, that Bilateral Agreement will provide for the specific terms relating to the charging option and for the relevant paragraphs of Section 2 to apply (or be disapplied) subject to those specific terms. This may lead to the areas covered by the relevant Bilateral Agreement being wider in certain circumstances. 1.2 APPLICABILITY 1.2.1 Each User is required to comply with the various Sections of the CUSC as provided for in this Section 1. Each Section may contain further detail in relation to particular categories of connection and/or use. 1.2.2 The different categories of connection and/or use reflect the types of utilisation which can exist. For example a User could have a directly connected Power Station and also be acting as a Supplier. In that case that User will need to comply in relation to two categories of connection and/or use, and its obligations in relation to each will differ. CUSC v1.19 Page 3 of 12 v1.19 10 June 2025 1.2.3 Section 1, Sections 5 to 8, 11 and 14 of the CUSC apply to all categories of connection and/or use, and therefore should be complied with by all Users, subject as specifically provided in those Sections. Section 4 of the CUSC applies to Users who provide Balancing Services to The Company, and contains its own provisions on applicability to such Users. 1.2.4 In relation to Sections 2, 3, 9, 15 and 16 the following table sets out the applicability of those Sections in addition to those Sections referred to in Paragraph 1.2.3: Categories Applicable Sections 1. Power Station directly connected to the GB Transmission System (including in the case of OTSDUW Build, a Power Station connected prior to the OTSUA Transfer Time by means of OTSUA) 2 and 3 and 15 and 16 2. Non-Embedded Customer Site 2 and 16 3. Distribution System directly connected to the GB Transmission System 2 and (where a Construction Agreement is associated with Distributed Generation) 15 and (except where a Construction Agreement is required because of a connection to that Distribution System and the Distribution Queue Management Process applies) 16 4. Suppliers 3 only 5. Embedded Power Station except those which are the subject of a BELLA 3 only and, where the subject of a BEGA, 15 6. Small Power Station Trading Parties 3 only 7. Interconnector User 9 Part II only 8. Interconnector Error Administrator 9 Part II only CUSC v1.19 Page 4 of 12 v1.19 10 June 2025 Categories Applicable Sections 9. Interconnector Owner 9 Part I only and 15 and 16 10. Distribution Interconnector Owner 3 Only 11. Embedded Exemptable Large Power Stations whose Boundary Point Metering System is either SMRS registered or is registered in CMRS by a User who is responsible for the Use of System Charges associated with the BM Unit registered in CMRS None 12 Virtual Lead Party (VLP) 3 only Users, when making a Connection Application or Use of System Application (in each case in the form of the relevant exhibit), should identify the category for which they are applying. 1.2.5 Each Bilateral Agreement, Use of System Supply Confirmation Notice or Use of System Interconnector Confirmation Notice, will set out the category of connection and/or use to which it relates. 1.2.6 Where a Paragraph states a category of connection and/or use, or type of User, to which that Paragraph (or part of that Paragraph) applies, the application of that Paragraph (or part of Paragraph) shall be limited to the User in relation to that category of connection and/or use, or type of User, described. 1.2.7 Where a Paragraph does not state a category of connection and/or use, or type of User, to which that Paragraph (or some part of that Paragraph) applies, that Paragraph (or part of the Paragraph) shall apply to all types of Users and categories of connection and/or use. 1.2.8 Where a Paragraph is stated “as between The Company and that User”, rights and obligations under that Paragraph shall arise only between The Company and each User individually to whom that Paragraph applies. Accordingly, no User shall enjoy any rights nor incur any obligations against any other User pursuant to the terms of any such Paragraph. 1.2.9 Notwithstanding any other provision of this Code, where a User owns or operates an Exemptable Embedded Large Power Station which is Embedded in part of a Distribution System or the System of any other User where and to the extent that such part of the system in which the Exemptable Embedded Large Power Station is CUSC v1.19 Page 5 of 12 v1.19 10 June 2025 Embedded is not directly or indirectly connected to the GB Transmission System, that User need not comply with paragraphs 1.3, 1.7, 6.3.6 and 6.3.7 in respect of that Exemptable Embedded Large Power Station. 1.2.10 Section 17 applies to all Gated Applications. 1.3 BILATERAL AGREEMENTS, CONSTRUCTION AGREEMENTS AND MANDATORY SERVICES AGREEMENTS 1.3.1 Bilateral Agreements (a) Each User in respect of each category of connection and/or use with a direct connection to the National Electricity Transmission System shall enter into and comply with a Bilateral Connection Agreement in relation to such connection and/or use as identified in Paragraph 1.3.1(e). (b) Each User in respect of each category of connection and/or use with an Embedded Power Station (except those which are the subject of a BELLA) and/or in relation to a Small Power Station Trading Party and/or a Distribution Interconnector shall enter into and comply with a Bilateral Embedded Generation Agreement in relation to such use as identified in Paragraph 1.3.1(e). (c) Each User in respect of its Embedded Exemptable Large Power Station whose Boundary Point Metering System is registered in SMRS or is registered in CMRS by another User who is responsible for the Use of System Charges associated with the BM Unit registered in CMRS shall enter into and comply with a BELLA as identified in Paragraph 1.3.1(e). (d) Each User with a Secondary BM Unit shall enter in to and comply with a Virtual Lead Party Agreement in respect of the VLP Assets as identified in Paragraph 1.3.1(e). (e) Exhibits 1, 2, 5 and 7 in Schedule 2 to the CUSC contain the forms of Bilateral Agreements contemplated to be entered into pursuant to this Paragraph 1.3, being: (i) Exhibit 1 – Bilateral Connection Agreement: direct connection to the National Electricity Transmission System (Power Station directly connected CUSC v1.19 Page 6 of 12 v1.19 10 June 2025 to the NETS Distribution System directly connected to the NETS, Non-Embedded Customer Site and/or Interconnector); (ii) Exhibit 2 – Bilateral Embedded Generation Agreement: embedded use of system (Embedded Power Station (except those which are the subject of a BELLA) and/or in relation to a Small Power Station Trading Party and/or Distribution Interconnector); (iii) Exhibit 5 – BELLA: provisions associated with such Embedded Exemptable Large Power Stations who have no rights and obligations under Section 3 of the CUSC. (iv) Exhibit 7 – Virtual Lead Party Agreement: embedded use of system in relation to VLP Assets 1.3.2 Construction Agreements Each User who wishes to construct or modify a direct connection to the GB Transmission System or commence or modify use by his Embedded Power Station or Distribution Interconnector, or any Distributor who wishes to connect a Relevant Embedded Power Station to his system shall enter into and comply with a Construction Agreement in respect of any construction works required as a result of that connection or Modification, together with a Bilateral Agreement as identified in Paragraph 1.3.1 or, as appropriate, an agreement to vary such Bilateral Agreement. In any case under the OTSDUW Arrangements, paragraph 1.5 applies to such Construction Agreement. 1.3.3 Mandatory Services Agreements (a) The Company and each User if a Generator shall, as between The Company and that User, in respect of the Generating Units, DC Converters and Power Park Modules from which that User is required to provide the Mandatory Ancillary Services in accordance with the Grid Code, enter into and comply with a Mandatory Services Agreement where applicable in accordance with Paragraph 1.3.3(b) in a form to be agreed between CUSC v1.19 Page 7 of 12 v1.19 10 June 2025 The Company and that User but based substantially on the form set out in Exhibit 4 in Schedule 2 (with necessary changes to enable the operation of those provisions, and those in Section 4 and Schedule 3 where the Generating Units, DC Converters or Power Park Modules (as the case may be) are not registered as BM Unit(s)). (b) Each User and The Company shall, as between The Company and that User, not later than 6 months (or such lesser time as may be agreed) prior to the expected Commissioning Programme Commencement Date, have entered into a Mandatory Services Agreement providing for payment for Mandatory Ancillary Services to be supplied by the User to The Company. In the event of a Mandatory Services Agreement not having been entered into by the said date, either party shall be entitled to initiate the procedure for resolution of the issue as an Other Dispute in accordance with Paragraph 7.4 to settle the terms of the said Mandatory Services Agreement. The Company shall not Energise the User’s Equipment or in the case of an Embedded Power Station issue an Operational Notification until the said Mandatory Services Agreement shall have been entered into by both parties. 1.3.4 General Provisions (a) Bilateral Agreements and Construction Agreements which are entered into between The Company and Users shall be in or substantially in the relevant exhibited form of Bilateral Agreement and/or Construction Agreement unless the parties thereto agree otherwise. (b) Each and every Bilateral Agreement, Mandatory Services Agreement and Construction Agreement entered into by a User and in force from time to time shall constitute a separate agreement governed by the terms of the CUSC and will be read and construed accordingly. For the avoidance of doubt no User shall enjoy any rights nor incur any obligations against any other User pursuant to the terms of any Bilateral Agreement, Mandatory Services Agreement or Construction Agreement. CUSC v1.19 Page 8 of 12 v1.19 10 June 2025 1.4 CONNECT AND MANAGE ARRANGEMENTS 1.4.1 Any Offer or Modification Offer made to an Applicant or User in the category of: (a) a Power Station directly connected to the National Electricity Transmission System; or (b) an Embedded Power Station which is the subject of a Bilateral Embedded Generation Agreement or a Bilateral Embedded Licence Exemptable Large Power Station Agreement; or (c) where such Offer or Modification Offer is associated with Distributed Generation, a Distribution System directly connected to the National Electricity Transmission System, shall be offered on the basis of the Connect and Manage Arrangements. 1.4.2 Transitional Arrangements The Company shall as soon as reasonably practical after the Connect and Manage Implementation Date and in any event by the end of the Connect and Manage Transition issue: (a) a revised Offer on the basis of the Connect and Manage Arrangements as regards any Offer issued but not accepted pursuant to the Interim Connect and Management Arrangements (b) an offer to vary each Existing ICM Construction Agreement such that it is in a form and on terms consistent with a Construction Agreement entered into on the basis of the Connect and Manage Arrangements; and/or (c) a Modification Offer as regards any Bilateral Agreement entered into on the basis of the Interim Connect and Manage Arrangements which would require amendments in order to comply with the Connect and Management Arrangements, in each case on terms no less advantageous than those contained in offers made or agreements entered into pursuant to the Interim Connect and Manage Arrangements. The Applicant or User (as appropriate) shall be entitled to accept such a proposal or continue with its existing arrangements. CUSC v1.19 Page 9 of 12 v1.19 10 June 2025 1.5 OTSDUW ARRANGEMENTS 1.5.1 Any Offer or Modification Offer made to an Applicant in respect of a New Connection Site located in Offshore Waters shall, unless the Applicant indicates otherwise, be made on the assumption that the User (following agreement with The Company) will undertake OTSDUW Build. For the avoidance of doubt, this shall not prevent the Applicant and The Company from agreeing (prior to signing the Construction Agreement) that the scope of OTSDUW will be narrower than that set out in the Offer or that OTSDUW will not be undertaken by the User. 1.5.2 Provisions of the CUSC which apply in relation to OTSDUW and OTSUA, and/or a Transmission Interface Site, shall (in any particular case) apply up to the OTSUA Transfer Time, whereupon such provisions shall (without prejudice to any prior non-compliance) cease to apply, without prejudice to the continuing application of provisions of the CUSC applying in relation to the relevant Offshore Transmission System and/or Connection Site. 1.5.3 OTSUA Completion Notice 1.5.3.1 In the case of OTSDUW Build, The Company will issue the OTSUA Completion Notice to the Authority on the OTSUA Completion Notice Trigger Date and The Company shall also provide a copy of such OTSUA Completion Notice to the User. 1.5.3.2 In respect of any OTSUA Operational at the OTSUA Commissioning Period Effective Date, The Company will issue the OTSUA Completion Notice to the Authority as soon as practicable within 10 Business Days after the OTSUA Commissioning Period Effective Date and The Company shall also provide a copy of such OTSUA Completion Notice to the User. An OTSUA Completion Notice issued in accordance with this paragraph 1.5.3.2 for any OTSUA Operational at the OTSUA Commissioning Period Effective Date, shall be issued with effect from the same date for all OTSUA Operational at the OTSUA Commissioning Period Effective Date. 1.5.4 Implementation Each Existing Offshore Agreement shall be read and construed on and from the OTSUA Commissioning Period Effective Date such that: (a) the defined terms within it, and the effect of those defined terms, shall be deemed to have the CUSC v1.19 Page 10 of 12 v1.19 10 June 2025 meanings they would have had if those agreements had been entered into after the OTSUA Commissioning Period Effective Date; and (b) the relevant Clauses within each Existing Offshore Agreement are amended and new Clauses introduced into each Existing Offshore Agreement so that each Existing Offshore Agreement is consistent in form and content with the changes introduced in CUSC Schedule 2 Exhibit 1 (Bilateral Connection Agreement) and Schedule 2 Exhibit 3A (Offshore Construction Agreement) on the OTSUA Commissioning Period Effective Date, and The Company and the User shall as quickly and as reasonably practicable take any steps as may be necessary to enable the Existing Offshore Agreements to be construed as if those agreements had been entered into after the OTSUA Commisioning Period Effective Date. 1.6 CATEGORIES OF USE WITHOUT BILATERAL AGREEMENTS 1.6.1 Three categories of use of the GB Transmission System do not require a Bilateral Agreement to be entered into as all the relevant provisions are included in the CUSC itself. These relate to Suppliers, Interconnector Users and Interconnector Error Administrators who in those categories of connection and/or use have no physical presence on the system. Further provisions on this are contained in Section 3 and Section 9 Part II. 1.7 BELLA APPLICATION 1.7.1 A User in respect of its Embedded Exemptable Large Power Station whose Boundary Point Metering System is registered in SMRS (or who intends to so register) or in CMRS by a User who is responsible for the Use of System Charges associated with the BM Unit registered in CMRS (or who intends to so register), shall complete and submit to The Company a BELLA Application and comply with the terms thereof. 1.7.2 The BELLA Application and BELLA Offer shall be processed in accordance with the Gated Application and Offer Process. The BELLA Offer shall be in the form of a BELLA. 1.7.3 The BELLA Offer shall remain open for acceptance (subject to CUSC Paragraph 6.10.4.4) for 3 months from its receipt by that User unless either that User or The Company makes an application to the CUSC v1.19 Page 11 of 12 v1.19 10 June 2025 Authority under Paragraph 1.7 of the CUSC, in which event the BELLA Offer shall remain open for acceptance until 14 days after any determination by the Authority pursuant to such application. 1.7.4 Upon acceptance of the BELLA Offer (as offered by The Company or determined by the Authority) by the User and execution by The Company, the User’s rights and obligations pursuant thereto shall commence in accordance with its terms. Such rights and obligations shall continue until the BELLA is terminated. 1.7.5 A User who is required by this Paragraph 1.7 to submit a BELLA Application shall not energise or operate its Embedded Exemptable Large Power Station until it has entered into a BELLA with The Company and until The Company has issued the User with an Operational Notification in accordance with the terms of the BELLA. 1.8 AUTHORITY'S RIGHT TO DETERMINE IN RESPECT OF A BELLA 1.8.1 If, after a period which appears to the Authority to be reasonable for the purpose, The Company or the User have failed to enter into a BELLA in respect of the Embedded Exemptable Large Power Station either The Company or the User may apply to the Authority for the Authority to settle any terms of the BELLA Offer in dispute. 1.8.2 Upon such application, the Authority, pursuant to section 7 (3) (c) of the Act, may settle any terms in dispute between The Company and the User in respect of such BELLA in such manner as appears to the Authority to be reasonable having (in so far as relevant) regard in particular to the following considerations: (a) that the performance by The Company of its obligations under the BELLA should not cause it to be in breach of those provisions referred to at condition E12.6 of the ESO Licence; (b) that any methods by which the Relevant Transmission Licensee’s transmission system is connected to any other System for the transmission or distribution of electricity accord (insofar as applicable to The Company) with the Grid Code, the STC and the Distribution Code; (c) that the terms and conditions of the BELLA so settled by the Authority and of any other agreements entered into by The Company pursuant to Paragraph 1.7 should be in as similar a form as is practicable. CUSC v1.19 Page 12 of 12 v1.19 10 June 2025 1.8.3 Where the Authority settles any terms in dispute, the User and The Company shall forthwith enter into the BELLA as settled. 1.8.4 If either the User or The Company proposes to vary the terms of the BELLA in a manner provided for under such agreement, the Authority may, at the request of The Company or the User, settle any dispute relating to such variation in such manner as appears to the Authority to be reasonable. END OF SECTION 1 CUSC v1.22 Page 1 of 33 v1.22 22 July 2025 CUSC - SECTION 2 CONNECTION CONTENTS 2.1 Introduction PART I - GENERAL 2.2 Being Operational, Connection and Energisation 2.3 Export of Power from Connection Site 2.4 Import of Power to Connection Site 2.5 Maintenance of Assets 2.6 Outages 2.7 Special Automatic Facilities 2.8 Protection and Control Relay Settings / Fault Clearance Times 2.9 Other Site Specific Technical Conditions 2.10 Safety Rules 2.11 Interface Agreement 2.12 Principles of Ownership 2.13 New Connection Sites PART II - CONNECTION CHARGES 2.14 Connection Charges 2.15 Revision of Charges 2.16 Data Requirements 2.17 Replacement of Transmission Connection Assets 2.18 Termination Amounts - Re-Use PART III - CREDIT REQUIREMENTS CUSC v1.22 Page 2 of 33 v1.22 22 July 2025 2.19 Security for Termination Amounts 2.20 Provision of Security for Termination Amounts where User meets Credit Rating 2.21 Provision of Security for Termination Amounts where User does not meet Credit Rating 2.22 Types of Security CUSC V1.22 Page 3 of 33 v1.22 22 July 2025 CUSC - SECTION 2 CONNECTION 2.1 INTRODUCTION 2.1.1 This Section deals with connection to the National Electricity Transmission System of User's Equipment at Connection Sites and certain related issues. 2.1.2 Part I of this Section 2 sets out general provisions relating to connection to the National Electricity Transmission System, Part II sets out provisions related to charging for connection and Part III sets out the credit requirements related to Termination Amounts. Section 3 which deals with Use of System will also be applicable in relation to a Power Station directly connected to the National Electricity Transmission System. 2.1.3 In the case of OTSDUW Build, if the Transmission Interface Site is Operational prior to the OTSUA Transfer Time, until the OTSUA Transfer Time the User’s Equipment will be connected to the National Electricity Transmission System through the connection of the OTSUA to the National Electricity Transmission System at the Transmission Interface Point. In such case up to the OTSUA Transfer Time certain provisions of this Section 2 will be applied as provided for in the relevant Bilateral Connection Agreement. Further provisions relating to OTSDUW Build are dealt with in section 11.2.7. PART I - GENERAL 2.2 BEING OPERATIONAL, CONNECTION AND ENERGISATION 2.2.1 Right to Remain Connected Subject to the other provisions of the CUSC, the relevant Bilateral Connection Agreement and the Grid Code, each User as between The Company and that User, shall have the right for the User's Equipment at each of its Connection Sites to be and/or remain connected to the National Electricity Transmission System at the Connection Site once Commissioned and then for the duration of the relevant Bilateral Connection Agreement in relation to that Connection Site. 2.2.2 Rights to remain Energised and Operational (a) Subject to the other provisions of the CUSC and in particular Paragraphs 2.2.2(b) and 2.2.3, the relevant Bilateral Connection Agreement and the Grid Code, each User as between The Company and that User, shall have the right for the User's Equipment at each of its Connection Sites to CUSC V1.22 Page 4 of 33 v1.22 22 July 2025 remain Energised and Operational once Commissioned for the duration of the relevant Bilateral Connection Agreement in relation to that Connection Site. (b) If the User becomes aware that the bank or insurance company issuing the Performance Bond or Letter of Credit ceases to be a Qualified Bank or that the company giving the Performance Bond ceases to be a Qualified Company, the User shall notify The Company in writing as soon as it becomes so aware. If The Company becomes aware that the bank or insurance company issuing the Performance Bond or Letter of Credit ceases to be a Qualified Bank or that the company giving the Performance Bond ceases to be a Qualified Company, The Company may notify the User to that effect in writing. Where the bank, insurance company or the company so ceases to be either a Qualified Bank or a Qualified Company (as the case may be) as a consequence of The Company having reasonable cause to doubt the continued rating of the said bank, insurance company or company, such notice shall be accompanied by a statement setting out The Company’s reasons for having such doubt. The User shall within 21 days of the giving of such notice by The Company or the User whichever is the earlier provide a replacement Performance Bond and/or Letter of Credit from a Qualified Bank or Qualified Company, as the case may be, and/or provide a cash deposit in the required amount in a Bank Account. From the date the replacement Performance Bond or Letter of Credit or Bank Account cash deposit is effectively and unconditionally provided and Valid, The Company will consent in writing to the security which it replaces being released. 2.2.3 Obligation to Remain Connected Without prejudice to its rights to make Modifications to the User's Plant (and/or User’s Equipment as the case may be) pursuant to the CUSC and subject to the provisions of Paragraph 5.2.2 and the other provisions of the CUSC, and the Grid Code, each User as between The Company and that User, shall keep the User's Equipment at each of its Connection Sites connected to the National Electricity Transmission System until Disconnection is permitted pursuant to the CUSC and the relevant Bilateral Connection Agreement or as otherwise agreed between the Parties. 2.2.4 Connection Entry Capacity With respect to a particular connection to the National Electricity Transmission System, each User acting in the category of a Power Station directly connected to the National Electricity Transmission System, as between The Company and that User, shall not operate CUSC V1.22 Page 5 of 33 v1.22 22 July 2025 its User's Equipment such that any of it exceeds the Connection Entry Capacity specified for each Generating Unit or the Connection Entry Capacity to the Connection Site such figures being set out in Appendix C to the relevant Bilateral Connection Agreement save as expressly permitted or instructed pursuant to an Emergency Instruction under the Grid Code or save as expressly permitted or instructed pursuant to the Fuel Security Code or as may be necessary or expedient in accordance with Good Industry Practice. 2.3 EXPORT OF POWER FROM CONNECTION SITE 2.3.1 Subject to the other provisions of the CUSC, the relevant Bilateral Connection Agreement and the Grid Code, The Company shall, as between The Company and that User, accept into the National Electricity Transmission System at each Connection Site of a User acting in the category of Power Station directly connected to the National Electricity Transmission System, power generated by such User up to the Transmission Entry Capacity and (if any) STTEC and\or LDTEC and\or any Temporary Received TEC less any Temporary Donated TEC for the relevant Period as set out in Appendix C of the relevant Bilateral Connection Agreement except to the extent (if any) that The Company is prevented from doing so by transmission constraints which could not be avoided by the exercise of Good Industry Practice by The Company. 2.3.2 Subject to the other provisions of the CUSC, the relevant Bilateral Connection Agreement and the Grid Code a User acting in the capacity of a Power Station directly connected to the National Electricity Transmission System shall not export on to the National Electricity Transmission System power generated by such User in excess of the Transmission Entry Capacity and (if any) STTEC and\or LDTEC and\or any Temporary Received TEC less any Temporary Donated TEC for the relevant Period as set out in Appendix C of the relevant Bilateral Connection Agreement save as expressly permitted or instructed pursuant to an Emergency Instruction under the Grid Code or save as expressly permitted or instructed pursuant to the Fuel Security Code or as may be necessary or expedient in accordance with Good Industry Practice. 2.4 IMPORT OF POWER TO CONNECTION SITE Subject to the other provisions of the CUSC and in particular Paragraph 2.2.2(b), the relevant Bilateral Connection Agreement and the Grid Code, The Company shall as between The Company and that User, transport a supply of power to each Connection Site of a User through the National Electricity Transmission System up to the Connection Site Demand Capability except to the extent (if any) that The Company is prevented from doing so by transmission constraints or by insufficiency of generation which, in either case, could not have been avoided by the exercise of Good Industry Practice by The Company. CUSC V1.22 Page 6 of 33 v1.22 22 July 2025 2.5 MAINTENANCE OF ASSETS Subject to the other provisions of the CUSC, the relevant Bilateral Connection Agreement, and the Grid Code, The Company shall as between The Company and that User use all reasonable endeavours to maintain the Transmission Connection Assets at each Connection Site in the condition necessary to render the same fit for the purpose of passing power up to the value of Connection Entry Capacity and Connection Site Demand Capability as appropriate between the User's Equipment and the National Electricity Transmission System. 2.6 OUTAGES Subject to the provisions of the Grid Code and the relevant Bilateral Connection Agreement, The Company and each User shall, as between The Company and that User, be entitled to plan and execute outages of parts of in the case of The Company the National Electricity Transmission System or Transmission Plant or Transmission Apparatus and in the case of the User its System or Plant or Apparatus at any time and from time to time. 2.7 SPECIAL AUTOMATIC FACILITIES The Company and each User shall, as between The Company and that User, operate respectively the National Electricity Transmission System and the User System in accordance with the schemes set out in Appendix F3 to the relevant Bilateral Connection Agreement. 2.8 PROTECTION AND CONTROL RELAY SETTINGS/FAULT CLEARANCE TIMES The Company and each User shall, as between The Company and that User, record the respective protection and control relay settings and fault clearance times to be operated by each of them in documents in the format set out in Appendix F4 to the relevant Bilateral Connection Agreement and shall operate them accordingly. 2.9 OTHER SITE SPECIFIC TECHNICAL CONDITIONS 2.9.1 Each User shall, as between The Company and that User, ensure that in the case of a Connection Site Commissioned prior to the Transfer Date, on the Transfer Date, and in the case of a Connection Site Commissioned after the Transfer Date on the Completion Date(s), the User's Equipment complies with the site specific technical conditions set out in Appendix F5 to the relevant Bilateral Connection Agreement. 2.9.2 Each User shall, as between The Company and that User, use all reasonable endeavours to ensure during the period in which it is a party to a particular Bilateral Connection Agreement that the User's CUSC V1.22 Page 7 of 33 v1.22 22 July 2025 Equipment which is subject to that Bilateral Connection Agreement shall continue to comply with the site-specific technical conditions set out in Appendix F5 to that Bilateral Connection Agreement. 2.9.3 If a User or The Company wishes to modify, alter or otherwise change the site specific technical conditions relating to a Connection Site or the manner of their operation: (a) under Appendix F4 to the relevant Bilateral Connection Agreement it may do so upon obtaining the agreement of the other party such agreement not to be unreasonably withheld; (b) under Appendices F1, F3 or F5 to the relevant Bilateral Connection Agreement it shall be deemed to be a Modification for the purposes of the CUSC. 2.9.4 Where, in the case of a Connection Site Commissioned in England and Wales prior to the Transfer Date, on or immediately prior to the Transfer Date a User's Equipment subject to a particular Bilateral Connection Agreement has any of the following technical attributes or facilities: (a) circuit breaker fail protection (b) pole slipping protection (c) fault disconnection facilities (d) automatic switching equipment (e) control arrangements (f) voltage and current signals for system monitoring (g) control telephony (h) operational metering, the User shall, as between The Company and that User, use all reasonable endeavours to ensure that during the period of such Bilateral Connection Agreement the User's Equipment which is subject to that Bilateral Connection Agreement retains such technical attributes or facilities provided always that if the User wishes to modify alter or otherwise change the same or their operation it may do so by following the procedures relating to a Modification in accordance with the CUSC. 2.10 SAFETY RULES Safety Rules CUSC V1.22 Page 8 of 33 v1.22 22 July 2025 2.10.1 In relation to a Connection Site The Company shall procure that the Relevant Transmission Licensee supplies to the User a copy of their Safety Rules current from time to time, including any site- specific Safety Rules, and also a copy of the Local Safety Instructions applicable at each Connection Site from time to time. 2.10.2 In relation to a Connection Site each User will supply to the Relevant Transmission Licensee a copy of their Safety Rules current from time to time, including any site-specific Safety Rules, and also a copy of the Local Safety Instructions applicable at each Connection Site from time to time. 2.11 INTERFACE AGREEMENT 2.11.1 In relation to Connection Sites and New Connection Site(s) The Company shall procure that the Relevant Transmission Licensee shall enter into an Interface Agreement with a User in either case in a form to be agreed between them but based substantially on the forms set out in Exhibit O to the CUSC as appropriate where such Interface Agreement(s) is/are required pursuant to the applicable Bilateral Connection Agreement or otherwise. 2.11.2 In relation to Connection Sites and New Connection Site(s) the User undertakes to enter into an Interface Agreement with the Relevant Transmission Licensee in a form to be agreed between them but based substantially on the forms set out in Exhibit O to the CUSC as appropriate where such Interface Agreement(s) is/are required pursuant to the applicable Bilateral Connection Agreement or otherwise. 2.12 PRINCIPLES OF OWNERSHIP 2.12.1 Subject to the Transfer Scheme or any contrary agreement in any Bilateral Agreement or any other agreement the division of ownership of Plant and Apparatus shall be at the electrical boundary, such boundary to be determined in accordance with the following principles: In the case of air insulated switchgear: (a) in relation to Plant and Apparatus located between the National Electricity Transmission System and a Power Station, the electrical boundary is at the busbar clamp on the busbar side of the busbar isolators on Generators and Power Station transformer circuits; (b) save as specified in Paragraph 2.12.1(c) below, in relation to Plant and Apparatus located between the National Electricity Transmission System and a Distribution System, the electrical boundary is at the busbar clamp on the CUSC V1.22 Page 9 of 33 v1.22 22 July 2025 busbar side of the Distribution System voltage busbar selector isolator(s) of the National Electricity Transmission System circuit or if a conventional busbar does not exist, an equivalent isolator. If no isolator exists an agreed bolted connection at or adjacent to the tee point shall be deemed to be an isolator for these purposes; (c) in relation to Transmission Plant and Transmission Apparatus located between the National Electricity Transmission System and a Distribution System but designed for a voltage of 132KV or below in England and Wales and below 132kV in Scotland, the electrical boundary is at the busbar clamp on the busbar side of the busbar selector isolator on the Distribution System circuit or, if a conventional busbar does not exist, an equivalent isolator. If no isolator exists, an agreed bolted connection at or adjacent to the tee point shall be deemed to be an isolator for these purposes; (d) in relation to Plant and Apparatus located between the National Electricity Transmission System and the system of a Non-Embedded Customer, the electrical boundary is at the clamp on the circuit breaker side of the cable disconnections at the Non-Embedded Customer’s sub- station; and In the case of metal enclosed switchgear, that is not Gas Insulated Switchgear: (e) the electrical boundary will be the equivalent of those specified in this Paragraph 2.12.1 save that for rack out switchgear, the electrical boundary will be at the busbar shutters. In the case of Gas Insulated Switchgear: (f) the electrical boundary will be the equivalent of those specified in this Paragraph 2.12.1 save that the electrical boundary will be at: (i) the first component on the outside of the Gas Insulated Switchgear Circuit Breaker gas zone on the User’s side of that gas zone or, where a circuit disconnector is fitted, the first component on the outside of the Gas Insulated Switchgear circuit disconnector gas zone, on the User's side of that gas zone; or (ii) the first gas zone separator on the busbar side of the busbar selection devices, and in such case the CUSC V1.22 Page 10 of 33 v1.22 22 July 2025 busbar selection devices’ gas zone may contain a single section of the busbar as agreed between The Company and the User and a diagram showing these electrical boundaries is attached at Schedule 1 to this Section 2. 2.12.2 If a User wants to use transformers of specialised design for unusual load characteristics at the electrical boundary, these shall not be owned by the User and shall form part of the National Electricity Transmission System but the User shall pay The Company for the proper and reasonable additional cost thereof as identified by The Company in the Offer covering such transformers. In this Paragraph 2.12.2 “unusual load characteristics” means loads which have characteristics which are significantly different from those of the normal range of domestic, commercial and industrial loads (including loads which vary considerably in duration or magnitude). 2.12.3 For the avoidance of doubt nothing in this Paragraph 2.12 shall effect any transfer of ownership in any Plant or Apparatus. 2.13 NEW CONNECTION SITES 2.13.1 If a User wishes to connect a New Connection Site it shall complete and submit to The Company a Connection Application (and if a Gated Application in accordance with the Gated Application and Offer Process) and comply with the terms thereof. An application for a New Connection Site which is not a Gated Application or which is a Gate 1 Application shall include the provision of at least one Letter of Authority in the form of one of the templates provided in Section 2, Schedule 2 in the case of a New Connection Site Onshore or a Letter of Acknowledgement in the case of a New Connection Site Offshore or a New Connection Site for Offshore Projects. 2.13.2 The Applicant shall ensure that a Letter of Authority in the form of one of the templates provided in Section 2 Schedule 2 (or multiple such letters taken in combination) shall be for a minimum area of land pertaining to the New Connection Site Onshore set out in the Connection Application, by reference to the minimum values specified in the Energy Density Table(s). The Applicant shall ensure that a Letter of Acknowledgement shall be for a minimum area of seabed pertaining to the New Connection Site Offshore or the New Connection Site for an Offshore Project (other than an Interconnector) set out in the Connection Application by reference to the offshore specific guidance in the LoA Guidance. 2.13.3 Where the Connection Application: CUSC V1.22 Page 11 of 33 v1.22 22 July 2025 2.13.3.1 is not a Gated Application for the purposes of the Gated Application and Offer Process, without prejudice to condition E12 of the ESO Licence The Company shall make a Connection Offer to that User as soon as practicable after receipt of the Connection Application and (save where the Authority consents to a longer period) in any event not more than 3 months after receipt by The Company of the Connection Application; and 2.13.3.2 is a Gated Application for the purposes of the Gated Application and Offer Process, The Company shall make a Connection Offer to that User in accordance with the Gated Application and Offer Process. 2.13.4 The Connection Offer and any offer to vary referred to in paragraph 2.13.10 shall remain open for acceptance (subject to CUSC Paragraph 6.10.4.4) for 3 months from its receipt by that User unless either that User or The Company makes an application to the Authority under condition E13 of the ESO Licence, in which event the Connection Offer shall remain open for acceptance until the date 14 days after any determination by the Authority pursuant to such application. 2.13.5 If the Connection Offer is accepted by that User the connection shall proceed according to the terms of the CUSC and the relevant Bilateral Connection Agreement and Construction Agreement entered into consequent upon acceptance of the Offer. 2.13.6 Prior to so proceeding a person who is not already a party to the CUSC Framework Agreement must become a party to the CUSC Framework Agreement. 2.13.7 Certain provisions relating to New Connection Sites and Transmission Interface Sites are dealt with in Section 6. This is due to their inter-relationship with the provisions on Modifications. 2.13.8 In the event that the User requests a Connection Offer in respect of a Connection Site located Onshore on the basis of a Design Variation then: (i) The Company shall only be obliged to provide such an offer in so far as such an offer satisfies the conditions detailed in Chapter 2 of the NETS SQSS; and (ii) The Company shall be obliged, at the request of the User as part of the Connection Offer, to provide such information that the User may reasonably require in order to assess the probability of Notification of Restrictions on Availability being issued. For the avoidance of doubt, the information that CUSC V1.22 Page 12 of 33 v1.22 22 July 2025 is provided by The Company under this clause shall be a best estimate only and is not legally binding. 2.13.9 In the case of New Connection Sites located in Offshore Waters the Connection Offer will identify the Onshore Construction Works. These will be based on assumptions about the Offshore Construction Works and these assumptions will be set out in the Construction Agreement. Where the Connection Offer is not made on the basis of the OTSDUW Arrangements, the Offshore Construction Works will not themselves be identified at that time. Where the Connection Offer is made on the basis of the OTSDUW Arrangements, the Connection Offer will identify initial Offshore Transmission System Development User Works as being the OTSDUW Build required to provide a connection between the User’s Equipment and the Onshore Transmission System at the Transmission Interface Point as set out in the assumptions. 2.13.10 In the case of New Connection Sites located in Offshore Waters, where a Connection Offer is not made on the basis of the OTSDUW Arrangements the Bilateral Connection Agreement and Construction Agreement for such New Connection Site will contain provisions specifically allowing them to be varied to reflect both the Offshore Construction Works and any changes necessary to the Onshore Construction Works once they have been identified and changes to the Construction Programme consequent on any delay in the appointment of the Offshore Transmission Owner from the date assumed in the relevant Construction Agreement. 2.13.11 In the case of New Connection Sites located in Offshore Waters, where a Construction Agreement is entered into on the basis of the OTSDUW Arrangements, the Construction Agreement for such New Connection Site will reflect the extent and scope of the Onshore Construction Works, the Offshore Construction Works and the Offshore Transmission System Development User Works as agreed between The Company and the User reflecting any changes in the assumptions referred to in paragraph 2.13.9 as agreed between The Company and the User prior to acceptance of the Connection Offer. The Construction Agreement may contain continuing assumptions and provisions allowing for its variation upon changes in such continuing assumptions. 2.13.12 In the case of a New Connection Site located in Offshore Waters: (a) The Company will include Offshore Restrictions on Availability in any Offer made for New Connection Sites located in Offshore Waters which meet the Offshore Standard Design or Design Variation but not where the design is of a standard equivalent to or higher than the deterministic criteria detailed in Paragraphs 2.5 to 2.13 of the NETS SQSS. The Bilateral Connection Agreement will specify the circumstances of Offshore Restrictions on CUSC V1.22 Page 13 of 33 v1.22 22 July 2025 Availability during which access to the National Electricity Transmission System will be restricted; and (b) In the event that the User requests a Connection Offer on the basis of a Design Variation then: (i) The Company shall only be obliged to provide such an offer in so far as such an offer satisfies the conditions detailed in Chapter 7 of the NETS SQSS; and (ii) The Company shall be obliged, at the request of the User as part of the Connection Offer, to provide such information that the User may reasonably require in order to assess the probability of Notification of Restrictions on Availability being issued. For the avoidance of doubt, the information that is provided by The Company under this clause shall be a best estimate only and is not legally binding. 2.13.13 In the case of a New Connection Site located in Offshore Waters and which is connected or to be connected to an ET Offshore Transmission System, The Company will include ET Restrictions on Availability in any Offer made and the Bilateral Connection Agreement will provide for access to the National Electricity Transmission System to be restricted during the ET Restrictions on Availability. 2.13.14 In the case where a User undertakes OTSDUW Build in respect of an ET Offshore Transmission System, the principles and intent of the OTSUA Commissioning Period will be applied to OTSUA connected to an ET Offshore Transmission System in a manner consistent with OTSUA connected at a Transmission Interface Site. CUSC V1.22 Page 14 of 33 v1.22 22 July 2025 PART II - CONNECTION CHARGES 2.14 CONNECTION CHARGES 2.14.1 Introduction Subject to the provisions of the CUSC, and the relevant Bilateral Connection Agreement, each User shall, as between The Company and that User, with effect from the relevant date set out in the relevant Bilateral Connection Agreement, be liable to pay to The Company the Connection Charges calculated and applied in accordance with the Statement of the Connection Charging Methodology and as set out in the relevant Bilateral Connection Agreement. The User shall make those payments in accordance with the provisions of the CUSC. The Company shall apply and calculate the Connection Charges in accordance with the Statement of the Connection Charging Methodology. 2.14.2 Security The User shall provide The Company with Security Cover in respect of Termination Amounts in respect of the Transmission Connection Assets commissioned after the Transfer Date in accordance with the provisions of Part III of this Section 2. 2.14.3 Connection Charges - Outturn Reconciliation (a) The following provisions relate to the ability for invoices to be issued for Connection Charges based on an estimate of the cost of Transmission Connection Asset Works, and for a reconciliation once those costs are known. (b) The Company shall be entitled to invoice each User for Connection Charges payable in accordance with the CUSC in respect of any Plant and Apparatus installed as part of the Transmission Connection Asset Works on the basis set out in the Statement of the Connection Charging Methodology, until the final cost of carrying out the said Transmission Connection Asset Works shall have been determined. (c) As soon as practicable after the Completion Date and in any event within one year (or such later period as The Company and the relevant User shall agree) thereof. The Company shall, as between The Company and that User, provide to the User a written statement specifying the Connection Charges calculated in accordance with the Charging Statements based on the cost of carrying out the Transmission Connection Asset Works (the “Cost Statement”). The Company shall be entitled to revise CUSC V1.22 Page 15 of 33 v1.22 22 July 2025 Appendix B to the relevant Bilateral Connection Agreement accordingly. (d) In the event that the Connection Charges specified in the Cost Statement are greater than the amount paid by the User based on The Company’s estimate under Paragraph 2.14.3(b), the User shall pay to The Company the difference between the two amounts plus interest on a daily basis from the date of payment by the User of the amounts calculated on The Company’s estimate to the date of payment by the User of the difference at the Base Rate. In the event that the Connection Charges specified in the Cost Statement are less than the amount paid by the User based on The Company’s estimate, The Company shall pay to the User the difference between the two amounts plus interest on a daily basis from the date of payment by the User of the amounts calculated on The Company’s estimate to the date of repayment by The Company at the Base Rate. Such payment of reconciliation shall be made by one party to the other within 28 (twenty eight) days of the Cost Statement. 2.14.4 Connection Charges - One-off Charges (a) The following provisions relate to the payment for certain One-off Works, which arise in relation to the construction of a Connection Site. (b) Each User shall forthwith on the relevant date set out in the relevant Bilateral Connection Agreement be liable to pay to The Company the One-off Charge (if any) as set out in the relevant Bilateral Connection Agreement. (c) The Company shall invoice the User for an amount equal to The Company’s estimate of the One-off Charge before, on or after the relevant date set out in the relevant Bilateral Connection Agreement and the User shall pay to The Company the amount stated in The Company invoice at the later of such relevant date or 28 (twenty eight) days after the date of the said invoice. (d) As soon as practicable thereafter The Company shall provide the User with a statement of the One-off Charge. In the event of the amount specified in the statement being more than the amount paid by the User to The Company in terms of Paragraph 2.14.4(c), the User shall pay to The Company the difference plus interest on a daily basis from the date of the invoice under Paragraph 2.14.4(c) to the date of invoice for the difference at the Base Rate from time to time within 28 days (twenty eight) days of the date of The Company’s invoice. In the event of the amount specified in the statement being less than the amount paid by the User under the terms CUSC V1.22 Page 16 of 33 v1.22 22 July 2025 of Paragraph 2.14.4(c), The Company shall forthwith pay to the User an amount equal to the difference plus interest calculated on a daily basis at the Base Rate from the date of payment by the User under Paragraph 2.14.4(c) to the date on which the difference is repaid by The Company. 2.14.5 Connection Charges – Site Specific Maintenance Charge (a) The Company shall be entitled to invoice each User for the indicative Site Specific Maintenance Charge in each Financial Year as set out in the Statement of the Connection Charging Methodology. (b) As soon as reasonably practicable and in any event by 31 July in each Financial Year The Company shall: (i) in accordance with the Statement of the Connection Charging Methodology calculate the actual Site Specific Maintenance Charge that would have been payable by the User during the preceding Financial Year (the “Actual Charge”) and compare this with the indicative Site specific Maintenance Charge received from the User during the preceding Financial Year (the “Notional Charge”) and (ii) prepare and send to the User a Maintenance Reconciliation Statement specifying the Actual Charge and the Notional Charge for the preceding Financial Year. (c) Two months after the date of issue of the Maintenance Reconciliation Statement and in any event by 30 September The Company shall issue a credit note in relation to any sums shown by the Maintenance Reconciliation Statement to be due to the User or an invoice in respect of sums due to The Company (such invoice to be payable within 30 days of the date of the invoice) and in each case interest thereon calculated pursuant to Paragraph 2.14.5(d) below. (d) Interest on all amounts due under this Paragraph 2.14.5 shall be payable by the paying CUSC Party to the other on such amounts from the date of payment applicable to the month concerned until the date of invoice for such amounts and such interest shall be calculated on a daily basis at a rate equal to the Base Rate during such period. 2.14.6 The Connection Charges shall be paid as specified in paragraph 6.6.1(a) and shall be treated as a recurrent monthly payment. 2.14.7 The User shall be liable to pay The Company Termination Amounts in the event of the termination of the User's Bilateral Connection CUSC V1.22 Page 17 of 33 v1.22 22 July 2025 Agreement (or in the case of Paragraph 5.3.4 Disconnection of the User's Equipment) in accordance with Section 5 of the CUSC. 2.14.8 The Connection Charges in the Financial Year in which the relevant date for charging set out in the relevant Bilateral Connection Agreement occurs shall be apportioned as follows:- For each complete calendar month from that date to the end of the Financial Year in which the date occurs the User shall be liable to pay one twelfth of the Connection Charges and for each part of a calendar month the User shall be liable to pay to The Company one twelfth of the Connection Charges prorated by a factor determined by the number of days for which the User is liable divided by the total number of days in such calendar month. 2.15 REVISION OF CHARGES 2.15.1 Pursuant to the ESO Licence and/or the CUSC and/or the Charging Statements and/or the Bilateral Agreements, The Company may revise its Connection Charges or the basis of their calculation including issuing revisions to Appendices A and B of the Bilateral Connection Agreements. 2.15.2 Subject to Paragraph 2.15.3 below, The Company shall give the User not less than 2 months prior written notice of any revised charges, including revisions to Appendices A and B of the Bilateral Connection Agreements, which notice shall specify the date upon which such revisions become effective (which may be at any time). The User shall pay any such revised charges and Appendix A and B shall be amended automatically (and a copy sent to the User) to reflect any changes to such Appendices with effect from the date specified in such notice. 2.15.3 Where in accordance with the ESO Licence, the Authority requires a shorter period than 2 months for the implementation of revised charges, the notice period will be determined by the Authority. Where The Company and the User agree a shorter period than 2 months for the implementation of revised charges, the notice period will be as agreed between the parties. The notice of revisions issued by The Company will specify when the new charges are effective and the User shall pay any such revised charges and Appendix A and B shall be amended automatically with effect from the date specified in such notice; 2.15.4 Subject to the provisions of Paragraph 2.17 (Replacement of Transmission Connection Assets) below, if in the reasonable opinion of The Company any development, replacement, renovation, alteration, construction or other work to the National Electricity Transmission System or termination of a Bilateral Agreement or use of the National Electricity Transmission System by another User or an alteration to the requirements of the User or any other CUSC V1.22 Page 18 of 33 v1.22 22 July 2025 User means that to ensure that The Company is charging in accordance with the provisions of the Charging Statements pursuant to conditions E10 and E11 of the ESO Licence The Company needs to vary the Connection Charges payable by a User in relation to any of its Connection Sites then The Company shall have the right to vary such charges accordingly upon giving to the User not less than 2 months prior written notice. Following any such variation the provisions of Appendices A and B shall be amended automatically (and a copy sent to the User) to reflect such variation with effect from the date such variation comes into effect. 2.16 DATA REQUIREMENTS 2.16.1 On or before the end of the second week of December in each Financial Year, each User shall supply The Company with such data as The Company may from time to time reasonably request pursuant to the Charging Statements to enable The Company to calculate the Connection Charges due from the User to The Company in respect of the Connection Site including the data specified in the Charging Statements. 2.16.2 Where the relevant date for charging set out in the relevant Bilateral Connection Agreement in relation to Connection falls during a Financial Year the User shall on the date specified in writing by The Company to the User supply to The Company such data in respect