ISG122/02 v1.0

Page 1 of 3 © ELEXON 2011

ISG122/02

Clyde Non-Standard BM Unit Application

Meeting Name Imbalance Settlement Group

Meeting Date 29 March 2011

Purpose of paper For Decision

Summary The ISG is requested to approve the proposed non-standard BM Unit configuration for 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 2 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 3 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

david.kemp@elexon.co.uk

020 7380 4303

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.

.

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.

Clyde Windfarm (Scotland) Ltd.

Inveralmond House,

200 Dunkeld Road

Perth

PH1 3AQ

ISG122/02 - Attachment A

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.

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

ISG122/02 - Attachment A

Clyde Wind Farm (349.6 MW) – Proposed BMU Arrangement

GRID

INTERFACE

CLYDE SOUTH 1

66.7 MW

(29 x 2.3 WTGs)

CLYDE CENTRAL 1

66.7 MW

(29 x 2.3 WTGs)

TO ELVANFOOT

SUBSTATION

TO ELVANFOOT

SUBSTATION

275 kV 275 kV 275 kV

33 kV 33 kV 33 kV

CLYDE SOUTH 2

62.1 MW

(27 x 2.3 WTGs)

CLYDE CENTRAL 2

46.0 MW

(20 x 2.3 WTGs)

CLYDE NORTH 1

62.1 MW

(27 x 2.3 WTGs)

CLYDE NORTH 2

46.0 MW

(20 x 2.3 WTGs)

SG1A SG1B

SGT1A

SG1A SG1BSG2A SG2B

SGT1BSGT1A SGT2ASGT1B SGT2B

L10H10 H20

1CO 2CO 3CO 4CO 1CO 2CON1 N2 N3 N4 S1 S2

1SO 2SO 1SO 2SO3SO 4SO

5L5 3L5 1L5 5L5 3L5 1L52L5 4L5 2L5 4L5 6L515L5 13L5 11L5 12L5 14L5

GRID

INTERFACE

PPM1

BMU1

PPM2 PPM3 PPM4 PPM5 PPM6

BMU2 BMU3

2H0 4H0 1H0 2H0

From: Taylor, Brian [mailto:brian.taylor@uk.ngrid.com] Sent: 14 March 2011 15:35

To: BM Unit

Subject: RE: Clyde Windfarm Non-Standard BMU Application

Anna I am able approve SSE’s request to register and manage Clyde South, Clyde North and Clyde Central as 3 Non-Standard BM Units as shown in the diagram below. Brian Taylor National Delivery Manager

From: BM Unit [mailto:bm.unit@elexon.co.uk]

Sent: Monday, March 14, 2011 11:21 AM

To: Taylor, Brian Cc: David Kemp

Subject: FW: Clyde Windfarm Non-Standard BMU Application Importance: High Brian,

I understand from Sally that she forward this on to you to look at.

Are you in agreement with what is proposed by the applicant?

Many thanks,

Anna Millar

Settlement Operations

- ELEXON Limited, 4th Floor, 350 Euston Road, London, NW1 3AW - 020 7380 4368 - www.elexon.co.uk Switchboard - 020 7380 4100 Please consider the environment before printing this email

From: BM Unit Sent: 10 March 2011 09:16

To: Keith Campion; BMU Registration Cc: Anna Millar; BM Unit

Subject: FW: Clyde Windfarm Non-Standard BMU Application

Importance: High

Hi Keith, Sally,

Please find attached a non-standard BM Unit application for three NS BMUs for Clyde Windfarm. They want this to be presented to the March ISG as one of

the proposed BMUs is due to go live in ‘Q2 2011’, so we would need to finalise the ISG Paper for this by close of play next Tuesday. Please can you look at

these and provide any comments by noon on Monday?

Sally – if you are not the right person to look at these, can you forward this to whoever is, and ask them to provide NG’s comments by noon Monday?

I am out of the office on Leave from lunchtime today until Tuesday, but if you have any queries, Anna will be able to look into them on Monday.

Thanks,

David