ISG122/02 Clyde Non-Standard BM Unit Application
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ISG122/02 Clyde Non-Standard BM Unit Application Meeting Name Imbalance Settlement Group Meeting Date 29 March 2011 Purpose of paper For Decision The ISG is requested to approve the proposed non-standard BM Unit configuration for Summary Clyde Wind Farm. 1. Introduction – BM Unit Configurations 1.1 This paper summarises the requirements for BM Unit configurations specified in the Code and seeks the Imbalance Settlement Group’s (ISG) approval for a request by SSE Renewables Ltd for three non- standard BM Unit Configurations. 2. BM Unit Configuration – Code Obligations 2.1 The Code states that a BM Unit shall comprise Plant and Apparatus for whose Exports and/or Imports a Party is responsible (Section K3.1.1). 2.2 The Code also sets out a number of standard BM Unit configurations (Section K3.1.4), including: A Generating Unit, CCGT Module or Power Park Module for whose Exports the Metering System(s) is or are registered in Central Meter Registration Service (CMRS). 2.3 The Code then states (Section K3.1.6) that the Responsible Party can request the Panel considers a non- standard configuration, if the Plant and Apparatus does fall into such a category, but they consider a different configuration would satisfy the following criteria (Section K3.1.2): Responsibility will lie with one Party Will be capable of independent control Will be visible to the Settlement Administration Agent (SAA) as a metered quantity Will have Metering registered only in central or only in Supplier systems The BM Unit will be the smallest aggregation that satisfies the above 2.4 The Panel’s decision, once taking into consideration any representations from the relevant Party and with consultation from the Transmission Company, shall be final and binding. ISG122/02 v1.0 Page 1 of 3 © ELEXON 2011 ISG122/02 2.5 The Panel has delegated the authority to determine non-standard BM Unit Configurations to the ISG. 3. Clyde Wind Farm 3.1 Clyde Wind Farm is being developed in 3 phases: Clyde South, Clyde North and Clyde Central. Clyde South is due to be energised within the next three months and the other phases will be energised later in the year. 3.2 All phases connect to the 275kV Transmission System at Elvanfoot substation in South Lanarkshire. Each will connect to the 275kV Transmission System through three distinct Boundary Points (one for each proposed BM Units). 3.3 However, the point of asset ownership is on the Low Voltage side of the 33/275kV transformers, and there are two 33/275kv transformers each for Clyde South, Clyde North and Clyde Central (six in total). 3.4 The Grid Code definition of a Power Park Module determines the point of connection to the Transmission System to be the point at which the Transmission Network Owner takes ownership of the assets. Therefore, if we were to apply the standard BM Unit configurations, Clyde Wind Farm would consist of 6 Power Park Module BM Units. 3.5 The Party states that a configuration of two BM Units for each of the phases would not enable it to efficiently meet the requirement in Section K3.1.2 for a BM Unit to be “capable of being controlled independently”. This is because a distinct control system is in place for each of the phases and Clyde South, Clyde North and Clyde Central will all be required to respond as single entities in providing ancillary services and meeting Grid Code requirements. Therefore, it is the applicant’s opinion that one BM Unit for each phase is the smallest possible configuration for each of the phases that will satisfy all the other configuration criteria specified in Section K3.1.2. 3.6 Therefore the Party proposes a configuration of one BM Unit for Clyde South, Clyde North and Clyde Central respectively being three BM Units in total for Clyde Windfarm. 3.7 The Transmission Company supports this application. 4. Determination 4.1 The ISG is requested to consider whether the BM Unit configuration proposed by the applicant meets all the criteria set out in Section K3.1.2 of the Code. 5. Recommendation 5.1 We invite you to: a) APPROVE the proposed non-standard BM Unit configuration for Clyde Wind Farm. ISG122/02 v1.0 Page 2 of 3 © ELEXON 2011 ISG122/02 Attachments: Attachment A – Clyde Wind Farm Non-Standard BM Unit Application Letter Attachment B – 33kV Schematic Single Line Diagram for Clyde South Attachment C – 33kV Schematic Single Line Diagram for Clyde North Attachment D – 33kV Schematic Single Line Diagram for Clyde Central Attachment E – Summary View of BM Unit Configurations for Clyde Wind Farm Attachment F – Confirmation from National Grid (Transmission Company) of Acceptability of Proposed Configurations For more information, please contact: David Kemp Settlement Analyst [email protected] 020 7380 4303 ISG122/02 v1.0 Page 3 of 3 © ELEXON 2011 ISG122/02 - Attachment A . Clyde Windfarm (Scotland) Ltd. Inveralmond House, 200 Dunkeld Road Perth PH1 3AQ 9 March 2011 David Kemp Elexon Limited 4th Floor 350 Euston Road London NW1 3AW Dear David, APPLICATION FOR THREE NON-STANDARD BM UNITS FOR: CLYDE WINDFARM (SCOTLAND) LTD, INVERALMOND HOUSE, 200 DUNKELD ROAD, PERTH, PH1 3AQ Clyde Windfarm is a 350 MW onshore power generation project being developed by SSE Renewables Ltd., a wholly owned subsidiary of Scottish and Southern Energy plc. The project is being developed in 3 separate phases, referred to as Clyde South, Clyde North and Clyde Central. Clyde South is the first phase to deliver, with energisation of both SGTs planned for Q2 2011 with first generation to follow thereafter. Clyde North and Clyde Central will not energise until much later in the year. This application seeks approval to register and manage Clyde South, Clyde North and Clyde Central as 3 Non-Standard BM Units, as opposed to 6 PPMs. Clyde South, Clyde North and Clyde Central will all connect to the 275kV Transmission system of Scottish Power Energy Networks Limited at the Elvanfoot substation in South Lanarkshire. Although each project phase will connect to the main 275kV Transmission network through three distinct, single entry connection points (one for each proposed BMU), the point of asset ownership for Clyde South, Clyde North and Clyde Central all lie on the LV-side of the 33/275kV transformers at the 33kV circuit breakers. There will be six 33/275kV transformers, two for each project phase, supporting the interconnected electrical design and configuration as shown in the enclosed schematic and single line diagrams. The Grid Code definition of Power Park Module determines the point of connection to the transmission network to be the point at which the Transmission Network Owner takes ownership of the assets. Under Grid Code and BSC requirements for PPM registration, this arrangement would therefore require 6 BM Units to be established for each of the 33kV connection points. Grid Code additionally requires reactive power to be delivered at the High Voltage side of the transformers. SSE Renewables Holdings Limited is part of the Scottish and Southern Energy Group SSE Renewables Holdings Limited, Airtricity House, Ravenscourt Office Park, Sandyford, Dublin 18, Ireland. Tel: +353-1-6556 400 Fax: +353-1-6556 444 Web: www.sserenewables.com The Registered Office of SSE Renewables Holdings Limited is One Spencer Dock, North Wall Quay, Dublin 1, Ireland. Registered in Ireland No. 314061 Directors: Paul Dowling, Mark Ennis, Caoimhe Giblin, David Gardner (British), Alistair Phillips-Davies (British), Jim Smith (British), Pamela Walsh, Stephen Wheeler. ISG122/02 - Attachment A However, three distinct control systems will govern the operations of each of Clyde South, Clyde North and Clyde Central, and each phase of the project will be required to respond as a single entity in providing mandatory and commercial ancillary services, including provision of reactive power to comply with Grid Code requirements, Given these arrangements, SSE believe that the additional level of support that would be required to issue and process instructions, physical notifications, controls and settlement activity for 6 BM Units rather than 3 would be burdensome and unnecessary, given the degree of interconnection and control requirements described. For this reason we do not believe that the standard configuration of six BM Units enables us to independently control the Plant and Apparatus in an efficient way that enables us to also comply with Grid Code obligations. We are therefore of the opinion that 3 BM Units is the smallest configuration that will satisfy all of the other configuration criteria specified in Section K3.1.2 of the BSC. We therefore request and seek approval for the establishment of 3 non-standard BMUs to enable effective operation and settlement of Clyde South, Clyde North and Clyde Central. We would like to cite Scottish Power Renewables' windfarm projects, Arecleoch and Whitelee, which have been granted non-standard BMU set up previously for similar reasons as described above. Should any further information be required to assist in assessing this application, please do not hesitate to contact me. Yours Sincerely, Andrew Colley Energy Trading Projects Manager On behalf of SSE Renewables Ltd. Enclosures :- - 3 x construction line diagrams - 1 x commercial single line diagram with proposed BMU arrangement SSE Renewables Holdings Limited is part of the Scottish and Southern Energy Group SSE Renewables Holdings Limited, Airtricity House, Ravenscourt Office Park, Sandyford, Dublin 18, Ireland. Tel: +353-1-6556 400 Fax: +353-1-6556 444 Web: www.sserenewables.com The Registered Office of SSE Renewables Holdings Limited is One Spencer Dock, North Wall Quay, Dublin 1, Ireland. Registered in Ireland No. 314061 Directors: Paul Dowling, Mark Ennis, Donal Flynn, Ian Marchant (British), Alistair Phillips-Davies (British), Jim Smith (British), Pamela Walsh, Stephen Wheeler.