TBC Raised NESO low 25 Feb 2026 CMP467 Removal of outdated references in CUSC (charging) TBC Raised NESO low 25 Feb 2026 CMP468 Removal of outdated references in CUSC (non-charging) Standard (direct) Rejected Ocean Winds 13 Dec 2025 CMP450 Introducing the definition of Dynamic Reactive Compensation Equipment (DRCE) in the CUSC View summary also affects CMP418
Standard Workgroup RWE high 2 Dec 2025 CMP466 CMP456 Consequential Charging Modification Fast Track Decision NESO low 13 Nov 2025 CMP464 Section 14 Corrections Standard (direct) Withdrawn SSE 13 Nov 2025 CMP465 Construction Progression Milestones (M5-M8) Neutrality View summary
Self-Governance (direct) Implementation SSE high 31 Oct 2025 CMP463 Stabilising the Specific Onshore Expansion Factors from 1st April 2026 Urgent Implemented NESO 24 Oct 2025 CMP462 Provision for Alternate Panel Members View summary
Fast Track Implemented NESO 16 Oct 2025 CMP461 Rectifications to Legal Text following various implementations View summary
Standard Workgroup Innova high 8 Aug 2025 CMP460 Improving Transmission Connection Asset Charging TBC Withdrawn JG Pears 6 Aug 2025 CMP458 Prorating of transmission residual demand charges View summary also affects TBC
Standard Workgroup NESO medium 11 Jul 2025 CMP457 Revision of the Obligatory Reactive Power Service (ORPS) TBC Workgroup RWE high 19 Jun 2025 CMP456 Cost recovery for legacy plant in relation to GC0168 Urgent Implemented NESO 10 Jun 2025 CMP454 CMP434/CMP435
Section 11 Changes View summary
Fast Track Implemented NESO 10 Jun 2025 CMP455 Minor Amendments to the CUSC following implementation of CMP434/ CMP435 View summary
Standard Decision Triton Power high 30 Apr 2025 CMP453 To Bill BSUoS on a net basis at BSC Trading Units Urgent Withdrawn Brockwell Energy 27 Feb 2025 CMP452 Suspension of TNUoS Payments for generators connecting during the 2024/25 charging year View summary also affects CMP445
TBC Rejected Brockwell Energy 19 Feb 2025 CMP451 Suspending TNUoS payments when TOs and/or NESO has delayed connection date View summary
Fast Track Implemented NESO 13 Feb 2025 CMP449 Rectifications to pending 01 April 2025 implementation legal text View summary also affects CMP382, CMP408, CMP411, CMP424 and CMP430
Urgent Implemented NESO 7 Feb 2025 CMP448 Introducing a Progression Commitment Fee to the Gate 2 Connections Queue View summary also affects CMP434/CMP435
Standard Implemented NESO 17 Jan 2025 CMP447 Removal of designated strategic works from cancellation charges/securitisation View summary also affects CMP428 / STC CM094
Urgent Implemented NESO 14 Jan 2025 CMP446 Increasing the lower threshold in England and Wales for Evaluation of Transmission Impact Assessment (TIA) View summary also affects CMP434/CMP435
Urgent Workgroup Ocean Winds high 8 Nov 2024 CMP445 CMP445 Pro-rating first year TNUoS for Generators Urgent Rejected NESO 21 Oct 2024 CMP444 CMP444 Introducing a cap and floor to wider generation TNUoS charges View summary
Standard (direct) Implemented NESO 8 Oct 2024 CMP443 Removing references to “Fax” or “Facsimile” within the CUSC View summary also affects STC and Grid Code
Standard Workgroup RWE high 23 Sept 2024 CMP442 Introducing the option to fix Generator TNUoS charges Standard (direct) Workgroup Statkraft low 12 Sept 2024 CMP441 Reducing the credit risk of supplying non-embedded hydrogen electrolysers Standard Workgroup RWE high 14 Aug 2024 CMP440 Re-introduction of Demand TNUoS locational signals by removal of the zero-price floor Withdrawn 18 Jul 2024 CMP439 This modification proposal would remove the requirement for ≤100 MW licenced embedded generators to have a Bilateral Embedded Generator Agreement (BEGA) before participating in the Balancing Mechanism.
Implemented 10 Jun 2024 CMP438 This modification is to make some minor clarifications and corrections to the Connection and Use of System Code (CUSC) paragraph 14.25, which provides an illustrative example of a Transmission Network Use of System charge (TNUoS) demand reconciliation. It does not affect users’ charges.
Standard (direct) Implemented NESO 9 May 2024 CMP436 Update CUSC arrangements to replace the Electricity Arbitration Association (EAA) with the London Court of International Arbitration (LCIA) (Non-Charging) View summary
Standard (direct) Implemented NESO 9 May 2024 CMP437 Update CUSC arrangements to replace the Electricity Arbitration Association (EAA) with the London Court of International Arbitration (LCIA) (Charging) View summary
Urgent Implemented NESO 19 Apr 2024 CMP434 Implementing Connections Reform View summary also affects STC (CM095)
Urgent Implemented NESO 19 Apr 2024 CMP435 Application of Gate 2 Criteria to existing contracted background View summary also affects STC (CM096)
Standard Workgroup Scottish Power high 11 Apr 2024 CMP433 Optimised Transmission Investment Cost model (OpTIC) Urgent Rejected SSE 11 Mar 2024 CMP432 Improve “Locational Onshore Security Factor” for TNUoS Wider Tariffs View summary
Urgent Implemented NESO 16 Feb 2024 CMP430 Adjustments to TNUoS Charging from 2025 to support the Market Wide Half Hourly Settlement (MHHS) Programme’ View summary
Urgent Withdrawn NESO 16 Feb 2024 CMP431 Adjustments to TNUoS Charging from 2025 to support the Market Wide Half Hourly Settlement (MHHS) Programme (Non-Charging)’ View summary
Urgent Implemented ESO 11 Jan 2024 CMP428 User Commitment liabilities for Onshore Transmission circuits in the Holistic Network Design View summary
Fast Track Implemented ESO 11 Jan 2024 CMP429 Typographical and formatting updates following the implementation of CMP376 (Inclusion of Queue Management process within the CUSC) View summary
Urgent Implemented ESO 13 Dec 2023 CMP427 Update to the Transmission Connection Application Process for Onshore Applicants View summary
Standard Workgroup NESO medium 30 Nov 2023 CMP426 TNUoS charges for transmission circuits identified for the HND to add capacity across boundaries Urgent Implemented Nissan 24 Oct 2023 CMP425 Billing Demand Transmission Residual By Site View summary
N/A Rejected ESO 12 Oct 2023 CMP421 CUSC Section 14 – Housekeeping changes update View summary also affects N/A
N/A Rejected ESO 12 Oct 2023 CMP422 CUSC Non-Charging Housekeeping changes update View summary also affects N/A
Standard Decision SSE high 12 Oct 2023 CMP423 Generation Weighted Reference Node Standard Implemented NESO 12 Oct 2023 CMP424 Amendments to Scaling Factors used for Year Round TNUoS Charges View summary also affects SQSS
Standard Withdrawn SSE 14 Sept 2023 CMP420 Treatment of BSUoS Revenue Recovery and creation of a BSUoS Fund View summary
Standard Workgroup NESO high 10 Aug 2023 CMP419 Generation Zoning Methodology Review Standard Rejected Ocean Winds 2 Aug 2023 CMP418 Refine the allocation of Dynamic Reactive Compensation Equipment (DRCE) costs at OFTO transfer View summary also affects N/A
Standard Workgroup NESO medium 12 Jul 2023 CMP417 Extending principles of CUSC Section 15 to all Users View summary Open page also affects STC and STCP Standard Implemented NESO 11 Jul 2023 CMP415 Amending the Fixed Price Period from 6 to 12 months View summary also affects CUSC (CMP361 / CMP362) and CMP408
N/A Rejected National Grid ESO 11 Jul 2023 CMP416 Amending the Fixed Price Period from 6 to 12months with two seasonal tariffs View summary also affects N/A
Standard Workgroup NESO medium 13 Apr 2023 CMP414 CMP330/CMP374 Consequential Modification View summary Open page also affects CUSC (CMP330/ CMP374) and STC (CM079) Standard Rejected EDF Energy 16 Mar 2023 CMP413 Rolling 10-year wider TNUoS generation tariffs View summary
Self-Governance (direct) Implemented National Grid ESO 9 Feb 2023 CMP410 Payment Timescales for Monthly Payments View summary
Standard Implemented NESO 9 Feb 2023 CMP411 Introduction of Anticipatory Investment (AI) within the Section 14 charging methodologies. View summary also affects CUSC (CMP402)
Standard (direct) Implemented SSE Generation 9 Feb 2023 CMP412 CMP398 Consequential Charging Modification View summary also affects Grid Code (GC0148 and GC0156), CUSC (CMP398), SQSS (GSR032), STC (CM089 and STCP PM0128)
Standard Implemented NESO 12 Jan 2023 CMP408 Allowing consideration of a different notice period for BSUoS tariff settings View summary also affects CUSC (CMP361 / CMP362)
Implemented 12 Jan 2023 CMP409 As part of their decision on CMP363, Ofgem identified 2 changes that need to be made ahead of CMP363 implementation on 1 April 2023
Rejected 22 Nov 2022 CMP406 and CMP407 Seeks to provide an option for an ex ante fixed BSUoS tariff with a 12 month fixed period, 3 month notice period, and a P85 level BSUoS fund. CMP406 addresses the charging changes and CMP407 addresses the consequential definition changes
Standard Workgroup NESO low 10 Nov 2022 CMP402 Introduction of Anticipatory Investment (AI) principles within the User Commitment Arrangements View summary Open page also affects CUSC (CMP411) Standard (direct) Implemented NESO 10 Nov 2022 CMP403 Introducing Competitively Appointed Transmission Owners & Transmission Service Providers (Section 14) View summary also affects Grid Code (GC0159), STC (CM086/CM087) and SQSS (GSR031)
Standard (direct) Implemented NESO 10 Nov 2022 CMP404 Introducing Competitively Appointed Transmission Owners & Transmission Service Providers (Section 11) View summary also affects Grid Code (GC0159), STC (CM086/CM087) and SQSS (GSR031)
Standard Workgroup SSE Generation high 10 Nov 2022 CMP405 TNUoS Locational Demand Signals for Storage View summary Open page also affects CUSC (CMP393) Implemented 13 Oct 2022 CMP399 Seeks to make minor amendments to CUSC Section 14
Implemented 13 Oct 2022 CMP400 Seeks to make minor amendments to CUSC which sit outside of Section 14
Implemented 13 Oct 2022 CMP401 As a result of CMP318, the period by which Meter Point Administration Numbers (MPANs) in Measurement Classes F and G are treated as NHH for TNUoS was extended to 31 March 2023. CMP401 seeks to amend this date to align with Milestone 15 (M15) of the Market Wide Half Hourly Settlement (MHHS) Programme and relevant subsequent charging year.
Standard (direct) Decision NESO low 15 Aug 2022 CMP397 Consequential changes required to CUSC Exhibits B and D to reflect CMP316 (Co-Located Generation Sites) View summary Open page also affects CUSC (CMP316) Standard Implemented SSE Generation 15 Aug 2022 CMP398 GC0156 Cost Recovery mechanism for CUSC Parties View summary also affects Grid Code (GC0148 and GC0156), CUSC (CMP412), SQSS (GSR032), STC (CM089 and STCP PM0128)
Standard (direct) Rejected Saltend Cogeneration Company Ltd 11 Aug 2022 CMP396 Re-introduction Of BSUoS on Interconnector Lead Parties View summary
Implemented 11 Aug 2022 CMP395 Seeks to cap BSUoS per Settlement Period from 1 October 2022 (or such later date as the Authority may specify) to 31 March 2023, recoup the money in charging year 2023/24; and cap the liability to be carried by the ESO
Standard Rejected Zenobe 9 Jun 2022 CMP393 Using Imports and Exports to Calculate Annual Load Factor for Electricity Storage View summary also affects CUSC (CMP405)
Withdrawn 9 Jun 2022 CMP394 Seeks to exempt electricity storage assets in positive Transmission Network Use of System zones from payment of generation charges. Here, ‘electricity storage’ refers to all storage that has booked Transmission Entry Capacity (i.e. pumped and battery)
Standard Implemented SSE Generation 27 May 2022 CMP392 Transparency and legal certainty as to the calculation of TNUoS in
conformance with the Limiting
Regulation View summary
Implemented 23 May 2022 CMP391 Seeks to ensure there is a definition of “Charges for Physical Assets Required for Connection” which reflects the Limiting Regulation, in light of the conclusions in the Judgment (re: the judicial review proceedings) that was handed down on 11 April 2022 about what is required to achieve compliance.
Implemented 12 Apr 2022 CMP388 Ofgem’s recent decisions on CUSC modifications CMP335/336 and CMP340/343 contained several small changes/clarifications that would be beneficial in addition to some identified by the ESO. This proposal seeks to implement these clarifications.
Implemented 12 Apr 2022 CMP389 Seeks to implement changes related to band boundaries as stated in paragraph 3.12 of Ofgem’s recent decision on CUSC modification CMP343.
Implemented 12 Apr 2022 CMP390 The National Security and Investment (NSI) Act 2021 enables Government to scrutinise the acquisition of rights in entities and assets and intervene where there is a risk to national security. This modification seeks to amend the CUSC application forms to recognise and provide consent to ESO sharing information about the applicant with Government enabling BEIS to carry out any initial national security checks in line with the NSI Act and identify any issues at an early opportunity
Standard Withdrawn Scottish Hydro Electric Power Distribution Plc 10 Mar 2022 CMP385 Improvements to Securities and Liabilities provisions within CUSC View summary also affects STC
Withdrawn 9 Mar 2022 CMP386 Proposes to introduce a new generation classification for battery storage and pumped storage which, in the view of the Proposer, reflects the value that storage assets in generation constrained areas provide to transmission licensees
Withdrawn 9 Mar 2022 CMP387 Seeks to create a new generation classification for storage, and to exempt storage operators contracted to provide stability services from Transmission Network Use of System (TNUoS) charges
Implemented 8 Feb 2022 CMP384 Applies adjustments for inflation to manifest error thresholds using Indexation
Implemented 7 Feb 2022 CMP383 To enable the ESO to recover the costs deferred under CMP381, a licence change is required. This will not be in place for 1 April 2022. Therefore CMP383 seeks to change the recovery of CMP381 costs, to when the new licence comes into effect until 31 March 2023.
Implemented 11 Jan 2022 CMP382 Seeks to ensure that the use of “charging year” and “Working Day” in Section 14 is replaced and aligned with the already defined “Financial Year” and “Business Day”.
Implemented 16 Dec 2021 CMP381 Seeks to set a £/MWh cap on BSUoS from 1 January 2022 until 31 March 2022, due, in the view of the Proposer, to exceptional market conditions making BSUoS much higher than industry parties could reasonably have expected. The additional BSUoS costs above the cap would be deferred to the 2022/23 charging year, using the same approach as CMP350 and the recovery mechanism approved under CMP373.
Implemented 10 Nov 2021 CMP380 Seeks to remove any gender specific references or terminology within the CUSC.
Standard Implemented ESO 9 Sept 2021 CMP379 Determining TNUoS demand zones for transmission-connected demand at sites with multiple Distribution Network Operators (DNOs) View summary
Standard Implemented ESO 15 Jul 2021 CMP376 Inclusion of Queue Management process within the CUSC View summary also affects STC?
Implemented 15 Jul 2021 CMP377 Seeks to provide clarity on how the BSUoS charging methodology is described in Section 14 of the CUSC. The four areas being addressed are: Covid-19 cost recovery calculations, capitalisation of defined terms in CMP373 legal text, clarifying storage import terminology and general housekeeping
Standard Decision ESO high 10 Jun 2021 CMP375 Enduring Expansion Constant & Expansion Factor Review Implemented 20 Apr 2021 CMP373 On 9 April 2021, the ESO informed industry parties that they had underbilled BSUoS by ~£44m of Balancing Services costs incurred in 2020/21 made up of costs associated with trading activities and the Accelerated Loss of Mains Change Programme (ALoMCP). The Proposer is content with the approach for recovery of ALoMCP (~£10m) . However, the ESO have proposed to recover the cost associated with trading activities (~£34m) through the Reconciliation Final run (RF) for 2020/21, which the Proposer believes will cause significant problems for Suppliers, Generators and Consumers.
Implemented 15 Apr 2021 CMP370 A new Interactivity policy has been developed collaboratively with industry through the Energy Networks Association (ENA) Open Network Projects. This CUSC modification seeks to align the CUSC with this Interactivity policy.
Rejected 15 Apr 2021 CMP371 Allow Proposers to raise one CUSC Modification Proposal to seek changes to both charging and non-charging provisions within CUSC
Implemented 15 Apr 2021 CMP378 Seeks to place an obligation on The Company (defined in the CUSC as National Grid Electricity System Operator (NGESO) Limited) to comply with the obligations insofar as these apply to it under Section C12 (Market-wide Half-Hourly Settlement Implementation) of the Balancing and Settlement Code (BSC).
Rejected 14 Apr 2021 CMP368 and CMP369 CMP368 seeks to give effect to the Authority determination within the CMP317/327 decision published on the 17 December 2020 to amend the definition of Assets Required for Connection, create new definitions of ‘GB Generation Output’ and define Generator charges for use in the Limiting Regulation range calculation. To facilitate the change, CMP369 proposes to update the legal text relating to ‘Generation Output’ detailed in the tariff setting methodology within Section 14.14.5 and the Ex-Post Reconciliation within Section 14.17.37 of the CUSC to align with the updated definitions introduced by CMP368.
Implemented 26 Mar 2021 CMP366 Seeks to ensure that the legal text in paragraph 14.14.5 reads correctly, following the implementation of CMP346 and CMP324/CMP325 (WACM2).
Implemented 26 Mar 2021 CMP367 Seeks to amend Section 14 of the CUSC due to the overlap of the implementation of CMP333 and CMP360. It also aligns numbering within Section 14.30.
Implemented 11 Feb 2021 CMP361 To introduce an ex ante fixed volumetric BSUoS tariff set over a total fix and notice period of 14 months.
Implemented 11 Feb 2021 CMP362 To facilitate the implementation of BSUoS Reform by introducing and updating required definitions into CUSC section 11 from CMP308 and CMP361.
Implemented 11 Feb 2021 CMP363 CMP363 seeks to clarify the TNUoS Demand Residual charging arrangements for transmission connected sites that have a mix of Final and non-Final Demand.
Implemented 11 Feb 2021 CMP364 CMP363 seeks to clarify the TNUoS Demand Residual charging arrangements for transmission connected sites that have a mix of Final and non-Final Demand. CMP364 is to support CMP363 by changing Section 11 to add/amend/remove definitions as needed
Implemented 11 Feb 2021 CMP365 This modification is based upon the principles of Grid Code GC0131 ‘Quick Wins’. The aim is to incorporate a smoother and more efficient process for code modifications that will allow for the best use of industry time
Implemented 11 Feb 2021 CMP372 Seeks to ensure that retained EU law functions effectively in the context of the CUSC following the UK-EU Trade and Cooperation Agreement and the end of the transition period. It will ensure that the CUSC takes into account the provisions in the relevant Statutory Instruments prepared under the European Union (Withdrawal) Act 2018 as amended by the European Union (Withdrawal Agreement) Act 2020.
Implemented 29 Jan 2021 CMP360 To change the relevant parts of Section 14 so that the definitions and formulae used to calculate External and Internal BSUoS charges for each Settlement Period reflect the methodology used in the ESO Electricity System Operator licence for RIIO-2.
Withdrawn 12 Jan 2021 CMP358 The Small Generator Discount (SGD) is currently contained in the ESO’s licence. The SGD expires on 1 April 2021. Given the ongoing uncertainty over the Forward Looking and Access SCR, CMP358 proposes that the SGD is put into the CUSC and CMP359 will seek to define SGD and CPI/CPIH.
Withdrawn 12 Jan 2021 CMP359 The Small Generator Discount (SGD) is currently contained in the ESO’s licence. The SGD expires on 1 April 2021. Given the ongoing uncertainty over the Forward Looking and Access SCR, CMP358 proposes that the SGD is put into the CUSC and CMP359 will seek to define SGD and CPI/CPIH.
Implemented 23 Dec 2020 CMP357 To insert that the security factor for the purpose of calculating TNUoS tariffs will use the result of the assessment expressed to eight decimal places.
Implemented 18 Dec 2020 CMP355 Currently, Section 14 of CUSC uses the Retail Price Index (RPI) as the measure for index-linking various parts of the charging methodologies. With the RIIO2 Final Decision from Ofgem, the RPI measure of indexation has being replaced and so the CUSC needs to be revised accordingly to use the correct measure for setting TNUoS and Transmission Connection Asset (TCA) charges. CMP355 specifically seeks to change the relevant parts of Section 14 so that references to RPI are revised to the indexation method as set out in the transmission licence.
Implemented 18 Dec 2020 CMP356 Currently, Section 14 of CUSC uses the Retail Price Index (RPI) as the measure for index-linking various parts of the charging methodologies. With the RIIO2 Final Decision from Ofgem, the RPI measure of indexation has being replaced and so the CUSC needs to be revised accordingly to use the correct measure for setting TNUoS and Transmission Connection Asset (TCA) charges. CMP355 specifically seeks to change the relevant parts of Section 14 so that references to RPI are revised to the indexation method as set out in the transmission licence. CMP356 has been raised to support CMP355 by changing Section 11 to add supporting definitions
Implemented 27 Nov 2020 CMP354 Seeks to allow the ESO to ensure that any Capacity Allocation and Congestion Management Regulation (CACM) related payments (determined by the Authority) are paid to relevant interconnector licensees in 2021 and to facilitate the interconnector adjustment payment process for future Authority cost recovery decisions.
Implemented 30 Oct 2020 CMP353 Seeks to stabilise the locational signal at the start of the RIIO-2 period at the RIIO-1 value plus relevant inflation in each charging year until such time as the effect of any change in the locational signal can be better understood
Implemented 15 Oct 2020 CMP352 Amend the formulas in Appendix 2 of CUSC section 3 to ensure the 'Revised Indicative Annual TNUoS charge’ is calculated correctly
Implemented 10 Sept 2020 CMP351 To change the timescales by which Cash Deposits need to be provided to National Grid ESO through the bi-annual financial securities process.
Implemented 30 Jul 2020 CMP349 To clarify the definition of ‘Identified Onshore Circuit’ within Section 11 (Interpretations and Definitions) of the CUSC as a result of the CMP320 decision.
Implemented 16 Jul 2020 CMP348 To insert Exhibit Y (Electricity Balancing Guideline (EBGL) Mapping Table) into the CUSC and to amend the numbering in Section 6 (General Provisions).
Implemented 15 Jul 2020 CMP350 To change the BSUoS Covid Support Scheme introduced by CMP345 by 1) Reducing the current £15/MWh cap to £5/MWh; 2) Extending its application from 31 August 2020 to 30 September 2020; and 3) Introducing a formal limit of £100m for the amount to be deferred
Implemented 26 Jun 2020 CMP346 To amend incorrect and misleading references to old charging parameters in CUSC Section 14.
Implemented 26 Jun 2020 CMP347 To ensure the treatment for the three offshore local tariffs are consistent with each other and amend incorrect references relating to offshore local tariffs.
Implemented 19 May 2020 CMP345 Apply a cap of £15/MWh to the BSUoS price in each settlement period from the implementation date to the end of August 2020, Any under recovery of revenue from the application of the cap will be recovered through BSUoS charges equally across all settlement periods in the 2021/22 Charging Year.
Standard Decision RWE medium 13 May 2020 CMP344 Clarification of Transmission Licensee revenue recovery and the treatment of revenue adjustments in the Charging Methodology Implemented 13 May 2020 CMP342 Seeks to clarify, and confirm the position that NGESO has always applied, that when calculating the amount Users are required to secure under the CUSC, the amount of applicable Value Added Tax is to be included.
Implemented 13 May 2020 CMP343 Proposes the methodology for Transmission Demand Residual charges to be applied only to ‘Final Demand’ on a ‘Site’ basis, as well as how to treat negative locational charges and the application of any charging bands.
Withdrawn 24 Apr 2020 CMP332 To create a methodology by which the residual element of demand TNUoS can be apportioned to Half Hourly (HH) and Non Half-Hourly (NHH) demand, and a separate methodology to determine the ‘bands’ against which the residual element of demand TNUoS is levied
Implemented 18 Mar 2020 CMP339 Allow the CMP317/327 Workgroup to develop the appropriate definitions needed for the Original and any alternative Proposals and any other changes outside of Section 14 as appropriate.
Standard Workgroup NESO low 12 Mar 2020 CMP341 CUSC Sandbox: enabling derogation from certain obligations to support small-scale trials of innovative propositions View summary Open page also affects Grid Code (GC0140) Implemented 12 Mar 2020 CMP340 Seeks to allow the CMP343 Workgroup to develop the appropriate definitions needed for the Original and any alternative Proposals and any other changes outside of Section 14 as appropriate.
Standard Implemented SSE 16 Jan 2020 CMP337 Impact of DNO Contributions on Actual Project Costs and Expansion Factors View summary
Standard Implemented SSE 16 Jan 2020 CMP338 Impact of DNO Contributions on Actual Project Costs and Expansion Factors – New Definition of Cost Adjustment View summary
Implemented 16 Jan 2020 CMP334 CMP332 is developing a methodology for the Transmission Demand Residual to be applied only to ‘Final Demand’ on a ‘Site’ basis. This Modification creates the definitions of "Final Demand" and "Site".
Implemented 16 Jan 2020 CMP335 CMP332 is developing a methodology for the Transmission Demand Residual to be applied only to ‘Final Demand’ on a ‘Site’ basis. CMP334 creates the definitions of "Final Demand" and "Site". This modification aims to revise Section 3 and 11 of the CUSC to set out how/when the Residual is recovered from parties once the Residual charges are determined.
Implemented 16 Jan 2020 CMP336 CMP332 is developing a methodology for the Transmission Demand Residual to be applied only to ‘Final Demand’ on a ‘Site’ basis. CMP334 creates the definitions of "Final Demand" and "Site". This modification aims to revise Section 14 of the CUSC to set out how/when the Residual is recovered from parties once the Residual charges are determined.
Implemented 20 Dec 2019 CMP333 To give effect to Ofgem's decision to levy BSUoS to Suppliers on a gross volumetric basis.
Standard Workgroup Scottish and Southern Energy Power Distribution Limited low 28 Nov 2019 CMP328 Connections Triggering Distribution Impact Assessment View summary Open page also affects STC (CM078)
DCUSA (DCP 392) Standard Decision Energy Potential Limited medium 28 Nov 2019 CMP330/CMP374 Allowing new Transmission Connected parties to build Connection Assets greater than 2km in length View summary Open page also affects STC (CM079)
CUSC (CMP414) Standard Rejected Energy Potential Limited 28 Nov 2019 CMP331 Option to replace generic Annual Load Factors (ALFs) with site specific ALFs View summary
Implemented 28 Nov 2019 CMP329 Housekeeping Modification to amend National Grid Electricity Transmission Plc to National Grid Electricity System Operator in Schedule 2, Exhibit 7 of the CUSC
Implemented 25 Oct 2019 CMP325 The ESO has written a Cusc Modification Proposal (CMP324) to alter the manner in which rezoning is carried out within Section 14 of CUSC. This Mod proffers an alternative defect, better enabling the issue to be explored by a Workgroup
Implemented 10 Oct 2019 CMP326 To introduce a ‘Turbine Availability Factor’ into the CUSC to enable accurate calculation by the NGESO Control Centre and consequently accurate settlement of the Frequency Response capability of PPMs when some of the turbines on site are unavailable.
Implemented 27 Sept 2019 CMP324 The CUSC requires that generation zones, used for Transmission Network Use of System (TNUoS) tariff setting, are reviewed at the start of each price control period. This CMP seeks to change the zones and the underlying methodology used to establish them.
Implemented 19 Sept 2019 CMP295 Contractual Arrangements for Virtual Lead Parties (Project TERRE)
Implemented 19 Sept 2019 CMP321 Clarify the definition of ‘Affiliate’ within Section 11 of the CUSC as a result of CMP285 implementation.
Implemented 19 Sept 2019 CMP322 Seeks to amend the CUSC to create a mechanism for Ofgem to approve changes to the ESO Standard Contract Terms when those changes include amendments to the Terms & Conditions related to balancing.
Implemented 19 Sept 2019 CMP323 To ensure that the governance process for making future changes to the European Balancing Guidelines (EBGL) Article 18 (A18) T and Cs that are found in the CUSC incorporates the amendment process as laid out in EBGL Article 6 (A6) and Article (A10).
Implemented 26 Jul 2019 CMP319 As part of the Workgroup analysis, the Workgroup identified that CMP 280 and 281 are charging modification and as such can only change section 14 of the CUSC. If either modification is approved changes to other none charging sections of the CUSC will be required. These changes cannot be achieved with CMP280 And CMP281. The principle addition related to the definitions of storage as a class. The definitions are common to CMP 280, 281 and their alternates.
Implemented 26 Jul 2019 CMP320 Islands that have a MITS Node but are served by a single circuit radial link are exposed to non-cost reflective charging of a 1.8 Security Factor rather than the application of a 1.0 Security Factor. This proposal will apply a 1.0 Security Factor in that situation.
Implemented 31 May 2019 CMP317/327 Ensuring that average generator transmission charges set under the CUSC methodology did not fall below the €0-2.50/MWh range stipulated in EU regulation 838/2010 (The Limiting Regulation). (CMP317)
Change the TNUoS Charging Methodology such that the Residual element of Generator TNUoS is £0 (CMP327)
Implemented 22 May 2019 CMP318 To extend the period over which Meter Point Administration
Numbers (MPANs) in Measurement Classes F and G are treated as Non Half Hourly for Transmission Network Use of System (TNUoS) charging purposes
Standard Decision PeakGen high 16 Apr 2019 CMP315 TNUoS: Review of the expansion constant and the elements of the transmission system charged for Standard Decision NESO medium 16 Apr 2019 CMP316 TNUoS Charging Methodology for Co-located Generation Implemented 21 Mar 2019 CMP313 Critical Friend review period for submission of new modifications
Withdrawn 15 Feb 2019 CMP309 The proposed modification aims to ensure that retained EU law will function effectively in the context of the CUSC. In the event the United Kingdom leaves the European Union without an agreement, it will ensure that the CUSC takes into account the provisions in the relevant Statutory Instruments that have been prepared under the European Union (Withdrawal) Act 2018 as well as relevant consequential licence modifications.
Withdrawn 15 Feb 2019 CMP310 The proposed modification aims to ensure that retained EU law will function effectively in the context of the CUSC. In the event the United Kingdom leaves the European Union without an agreement, it will ensure that the CUSC takes into account the provisions in the relevant Statutory Instruments that have been prepared under the European Union (Withdrawal) Act 2018 as well as relevant consequential licence modifications.
Withdrawn 15 Feb 2019 CMP311 Seeks to change the amount of credit that is allowed to Suppliers under the User Allowed Credit requirements.
Implemented 15 Feb 2019 CMP312 Correcting erroneous legal text in Section 14 following implementation of CMPs 264/5 (consequential)
Implemented 15 Feb 2019 CMP314 To align the CUSC with the Grid Code on the use of Power Available in ESO headroom calculations for Power Park Modules.
Implemented 19 Oct 2018 CMP308 Seeks to better align GB market arrangements with those prevalent within other EU member states by removing BSUoS charges from Generation.
Implemented 28 Sept 2018 CMP306 Seeks to align the rate of return applied to the net asset value of connection points in the calculation of annual connection charges (as set out at paragraph 14.3.21 of the Connection Charging Methodology) to the pre-tax cost of capital in the price control of the Relevant Transmission Licensee (plus a margin of 1.5 percentage points in the case of MEA-linked assets). This will improve the cost reflectivity of the charges, since the return on capital will equal the Authority’s most recent assessment of that cost for the Relevant Transmission Licensee.
Withdrawn 20 Sept 2018 CMP307 Seeks to change the current collection of BSUoS from suppliers and embedded Exemptible generation to a methodology where BSUoS is charged on a gross basis to suppliers and BSUoS is charged on exports from embedded Exemptible generation.
Standard Workgroup SSE Generation medium 23 Aug 2018 CMP304 Improving the Enhanced Reactive Power Service by making it fit for purpose View summary Open page also affects CUSC (CMP305) Standard Workgroup NESO low 23 Aug 2018 CMP305 Removal of the Enhanced Reactive Power Service (ERPS) View summary Open page also affects CUSC (CMP304) Withdrawn 23 Aug 2018 CMP302 Extend the small generator discount until an enduring solution acknowledging the discrepancy between England and Wales, and Scotland is implemented
Rejected 19 Jul 2018 CMP303 Seeks to remove additional costs from local circuit expansion factors that are incurred beyond the connected, or to-be-connected, generation developers’ need.
Implemented 21 Jun 2018 CMP301 Building on CMP213, which introduced specific expansion factors for HVDC and subsea circuits, ensuring this is consistent with the rules for onshore circuits
Implemented 17 May 2018 CMP300 Seeks to improve the cost reflectivity of the Response Energy Payment (“REP”) for Balancing Mechanism Units (“BMUs”) with low or negative marginal costs, as a consequence of having a Contract for Difference (“CfD”)
Implemented 27 Apr 2018 CMP299 Consequential changes to the CUSC to facilitate the 2018-2021 ESO Incentive Scheme
Standard Implemented ESO 17 Apr 2018 CMP298 Updating the Statement of Works process to facilitate aggregated assessment of relevant and collectively relevant embedded generation View summary also affects STC (CM080)
Implemented 17 Apr 2018 CMP293 Legal
Separation changes to CUSC
sections, Exhibits & Schedules
(non charging)
Implemented 17 Apr 2018 CMP294 Legal
Separation changes to CUSC
Section 14
Implemented 17 Apr 2018 CMP296 Aligning the CUSC to the BSC post-P344 (Project TERRE) to exempt Virtual Lead Parties from BSUoS
Implemented 17 Apr 2018 CMP297 Aligning CUSC and BSC post-TERRE (Section 11) – consequential modification to introduce definition of Virtual Lead Party
Standard Workgroup NESO medium 15 Feb 2018 CMP288 Explicit charging arrangements for customer delays and backfeeds Standard Withdrawn SSE Generation 15 Feb 2018 CMP291 The open, transparent, non discriminatory and timely publication of the harmonised rules for grid connection (in accordance with the RfG, DCC and HVDC) and the harmonised rules on system operation set out within the Bilateral Agreements View summary also affects Grid Code (GC0117)
DCUSA
Standard Implemented ESO 15 Feb 2018 CMP292 Introducing a Section 8 cut-off date for changes to the Charging Methodologies View summary
Withdrawn 15 Feb 2018 CMP289 Consequential change to support the introduction of explicit charging arrangements for customer delays and backfeeds via CMP288
Implemented 15 Feb 2018 CMP290 Housekeeping change to CUSC Section 14 required as a result of the implementation of CMP264, CMP265, CMP268 and CMP282
Standard Rejected Npower 10 Oct 2017 CMP286 Improving TNUoS Predictability Through Increased Notice of the Target Revenue used in the TNUoS Tariff Setting Process View summary also affects CUSC (CMP244)
STC
Standard Withdrawn Npower 10 Oct 2017 CMP287 Improving TNUoS
Predictability Through Increased
Notice of Inputs Used in the
TNUoS Tariff Setting Process. View summary also affects CUSC (CMP244)
STC
Implemented 20 Jul 2017 CMP285 CUSC Governance Reform –
Levelling the Playing Field
Withdrawn 18 Jul 2017 CMP284 Improving TNUoS cost reflectivity (Reference Node)
Implemented 30 Jun 2017 CMP281 Aims to remove liability from storage facilities for the Balancing Services Use of System (BSUoS) charges on imports.
Rejected 22 Jun 2017 CMP280 Seeks to remove the Transmission Demand Residual charge from generation and electricity storage
Standard Withdrawn Alkane Energy Ltd 2 Jun 2017 CMP276 Socialising TO costs associated with ''green policies'' View summary
Rejected 18 Jan 2017 CMP275 Transmission Generator Benefits in the provision of ancillary and balancing services – levelling the playing field
Standard Withdrawn RWE 29 Sept 2016 CMP271 Improving the cost reflectivity of demand transmission charges View summary
Withdrawn 29 Sept 2016 CMP274 Proposed to update the transmission charging methodology to include a Peak demand tariff based on current locational element of the demand TNUoS charge methodology using the existing Triad methodology for determining user charges & a Winter Weekday demand tariff based on the current Demand residual element of the demand TNUoS charge methodology.
Rejected 19 Aug 2015 CMP250 Stabilising BSUoS with at least a twelve month notice period
Rejected 19 Aug 2015 CMP251 Removing the error margin in the cap on total TNUoS recovered by generation and introducing a new charging element to TNUoS to ensure compliance with European Commission Regulation 838/2010
TBC Rejected Brockwell Energy CMP459 Charging TNUoS on a monthly basis View summary also affects TBC