SRAS GUIDELINES FOR SYSTEM RESTART ANCILLARY SERVICES INCORPORATING: SRAS DESCRIPTION SRAS ASSESSMENT GUIDELINES SRAS QUANTITY GUIDELINES

Transcription

1 FOR SYSTEM RESTART ANCILLARY SERVICES INCORPORATING: SRAS DESCRIPTION SRAS ASSESSMENT GUIDELINES SRAS QUANTITY GUIDELINES BOUNDARIES OF ELECTRICAL SUB-NETWORKS SRAS TENDER GUIDELINES PREPARED BY: System Capability VERSION: 1.0 EFFECTIVE DATE: 5 September 2014 STATUS: FINAL This document is current to version 64 of the National Electricity Rules Approved for distribution and use by: APPROVED BY: TITLE: Mike Cleary Chief Operating Officer DATE: 5 September 2014 Copyright 2014 Australian Energy Market Operator Ltd

2 VERSION RELEASE HISTORY Version Release History Version Date Author Peer Review Approved Changes 1 5 Sep 2014 Harmohan Singh Arianwyn Lowe Brian Nelson Louise Thomson Mike Cleary Initial version of consolidated SRAS Guidelines following Rules consultation. IMPORTANT NOTICE: These SRAS Guidelines are made under the National Electricity Rules and have effect only for the purposes set out in those Rules. The National Electricity Rules and the National Electricity Law prevail over this document to the extent of any inconsistency Australian Energy Market Operator Limited. v1.0 5 September 2014 Page 2 of 28

3 CONTENTS Contents 1 COMMENCEMENT LEGAL AND REGULATORY FRAMEWORK SRAS DESCRIPTION INTRODUCTION DESCRIPTION OF PRIMARY AND SECONDARY RESTART SERVICE TECHNICAL AND RELIABILITY REQUIREMENTS TIMEFRAMES SRAS TECHNICAL REQUIREMENTS SRAS RELIABILITY REQUIREMENTS SRAS ASSESSMENT GUIDELINES INTRODUCTION GENERAL ASSESSMENT REQUIREMENTS BASIS AND PURPOSE OF ASSESSMENT INFORMATION REQUIRED POWER SYSTEM STUDIES OBJECTIVES STUDIES REQUIRED PERFORMANCE ASSESSMENT REQUIREMENTS SRAS TESTS Transitional PROVISIONS TEST REQUIREMENTS TEST REPORT Schedule 4.1: SRAS Test Requirements and Supplementary Information Schedule 4.2: SRAS Generator Modelling Data SRAS QUANTITY GUIDELINES INTRODUCTION NUMBER OF SRAS TYPE OF SRAS LOCATION OF SRAS PROCEDURE BOUNDARIES OF ELECTRICAL SUB-NETWORKS INTRODUCTION DETERMINATION OF BOUNDARIES Schedule 6.1: Boundaries of Electrical Sub-networks Schedule 6.2: Maps showing boundaries of the electrical sub-networks v1.0 5 September 2014 Page 3 of 28

4 7 SRAS TENDER GUIDELINES INTRODUCTION SRAS TENDER PROCESS Stage One Request for Expression of Interest Stage Two Invitation to Tender ASSISTANCE BY OTHERS Contract Term DISPUTES Schedule 7.1 Request for Expressions of Interest Schedule 7.2 Invitation to Tender Schedule 7.3 SRAS Agreement Figures Figure 6.1: Electrical sub-networks within Queensland Figure 6.2: Electrical sub-networks within New South Wales Figure 6.3: Electrical sub-network within Victoria Figure 6.4: Electrical sub-network within South Australia Figure 6.5: Electrical sub-network within Tasmania Figure 7.1: Procurement Process for SRAS v1.0 5 September 2014 Page 4 of 28

5 1 COMMENCEMENT Glossary In this document, a word or phrase in this style has the same meaning as given to that term in the National Electricity Rules (NER). In this document, capitalised words or phrases or acronyms have the meaning set out opposite those words, phrases, or acronyms in the table below. Unless the context otherwise requires, this document will be interpreted in accordance with Schedule 2 of the National Electricity Law. Defined Term AEMO Boundaries of Electrical Sub-Networks Delivery Point EOI Generator Modelling Data ITT Multiple Site SRAS NER SRAS SRAS Assessment Guidelines SRAS Description SRAS Equipment SRAS Guidelines SRAS Objective SRAS Procurement Objectives SRAS Provider SRAS Quantity Guidelines SRAS Tender Guidelines SRAS Test SRS Tender Test Report TNSP Trip to house load (or TTHL) Meaning Australian Energy Market Operator Limited The boundaries of electrical sub-networks determined by AEMO under clause B(b) of the NER, and set out in Section 6 of this document. The transmission network connection point to which a generating unit forming part of SRAS Equipment is assigned in the NEM. An expression of interest for the provision of SRAS submitted to AEMO. The data to be provided by an SRAS Provider to AEMO under the SRAS Assessment Guidelines (Schedule 4.2). An invitation to tender for the provision of SRAS issued by AEMO. An SRAS that is delivered using SRAS Equipment located at two or more sites linked via a transmission network or distribution network. National Electricity Rules System restart ancillary services The SRAS assessment guidelines referred to in clause A(e) of the NER, and set out in Section 4 of this document. The SRAS description referred to in clause A(d) of the NER, and set out in Section 3 of this document. One or more identified generating units and other facilities to be used to provide an SRAS. This document, comprising the SRAS Description, SRAS Assessment Guidelines, SRAS Quantity Guidelines, Boundaries of Electrical Sub-networks and SRAS Tender Guidelines. The SRAS objective referred to in clause A(a) of the NER The SRAS procurement objectives referred to in clause A(c) of the NER. A Generator with whom AEMO contracts to provide SRAS, or who submits an expression of interest or tender to provide SRAS to AEMO. The SRAS quantity guidelines referred to in clause A(f) of the NER, set out in Section 5 of this document. The guidelines set out in Section 7 of this document, forming part of the NMAS tender guidelines referred to in clause (a) of the NER. A physical test of the capability of SRAS Equipment to provide the SRAS, in accordance with the SRAS Assessment Guidelines (Section 4.4 and Schedule 4.1) The system restart standard determined by the Reliability Panel under the NER. A tender submitted in response to an ITT. A report prepared by an SRAS Provider following an SRAS Test, in accordance with the SRAS Assessment Guidelines. Transmission Network Service Provider An electrical islanding scheme using generating units that can disconnect from the transmission network following a major supply disruption and continue to supply their own auxiliaries or an isolated segment of system load. v1.0 5 September 2014 Page 5 of 28

6 1 COMMENCEMENT 1 COMMENCEMENT These SRAS Guidelines have been prepared by AEMO in accordance with the following clauses of the NER, with an effective date of 5 September SRAS Guideline SRAS Description SRAS Assessment Guidelines SRAS Quantity Guidelines Boundaries of Electrical Sub-Networks SRAS Tender Guidelines NER Reference A(d) A(e) A(f) B (b) 2 LEGAL AND REGULATORY FRAMEWORK The purpose of, and requirements for, each of the SRAS Guidelines is set out in the NER clauses identified in the table above. Each of the SRAS Guidelines must meet the SRAS Procurement Objectives under clause A(c) of the NER. This means they must be: (a) consistent with the SRAS Objective; (b) designed to ensure the SRS is met; and (c) designed to ensure that the need for SRAS in each electrical sub-network is met, to the extent that it is practicable and reasonable to do so, by AEMO entering into ancillary services agreements for the provision of primary restart services. The SRAS Objective (referred to as part of the SRAS Procurement Objectives) is defined in clause A(a) of the NER as follows: The objective for system restart ancillary services is to minimise the expected economic costs to the market in the long term and in the short term, of a major supply disruption, taking into account the cost of supplying system restart ancillary services, consistent with the national electricity objective. The SRS has been determined by the Reliability Panel, in accordance with clause 8.8.3(aa) of the NER. The SRS current at the effective date of these SRAS Guidelines was published on 1 August v1.0 5 September 2014 Page 6 of 28

7 3 SRAS DESCRIPTION 3 SRAS DESCRIPTION 3.1 INTRODUCTION This Section 3 is the SRAS Description under clause A(d) of the NER. The SRAS Description: (a) (b) describes each type of SRAS, identifying it as a primary restart service or a secondary restart service; describes the technical and availability requirements of each type of SRAS. 3.2 DESCRIPTION OF PRIMARY AND SECONDARY RESTART SERVICE Both a primary restart service and a secondary restart service consist of SRAS Equipment with the capability of restarting without drawing power from the power system and supply a contracted level of generation output to the Delivery Point within a contracted timeframe following a major supply disruption. Both a primary restart service and a secondary restart service must satisfy the technical, availability and reliability requirements detailed in Section 3.2. The requirements for each type of service only differ in relation to the availability and reliability requirements, which are detailed in Section TECHNICAL AND RELIABILITY REQUIREMENTS TIMEFRAMES In accordance with the SRAS Procurement Objectives, AEMO seeks to procure SRAS to ensure the SRS is met. The current standard specifies the following timeframe for the energisation and restoration of supply in each electrical sub-network following a major supply disruption: (a) (b) re-supply and energise the auxiliaries of power stations within 1.5 hours to provide sufficient capacity to meet 40% of peak demand in that sub-network; and restore generation and transmission such that 40% of peak demand in that sub-network could be supplied within 4 hours. In accordance with the SRAS Assessment Guidelines and the SRAS Tender Guidelines, AEMO will select the SRAS, or combination of SRAS, that enables the SRS to be met in each electrical sub-network in the most efficient manner. Accordingly, potential SRAS Providers will be required to indicate a timeframe within which the SRAS Equipment can provide the tendered MW capacity at the Delivery Point SRAS TECHNICAL REQUIREMENTS A primary restart service and a secondary restart service must meet the following requirements: (a) (b) A demonstrated black start capability and, in the case of TTHL, have approved tripping schemes 1 that automatically disconnect the generating unit(s) within the SRAS Equipment from the power system. A demonstrated ability to operate at zero export load for a minimum period specified in the SRAS Assessment Guidelines. (c) A demonstrated ability to close onto a de-energised busbar 2. (d) A demonstrated ability to supply a contracted level of generation output to the Delivery Point. 1 The tripping schemes must be able to be activated by sustained excessive high or low frequency excursions, and where required by AEMO; frequency rate-of-change and/or loss of synchronisation or sustained excessive low voltage excursions, with all settings specified or approved by AEMO. 2 The reason for this demonstrated ability is to ensure that there are no interlocks that would prevent closing onto a de-energised busbar. v1.0 5 September 2014 Page 7 of 28

8 3 SRAS DESCRIPTION (e) (f) (g) A demonstrated ability to control network voltage within limits to meet the minimum requirements specified by AEMO. A demonstrated ability to control power system frequency within limits to meet the minimum requirements specified by AEMO. The service must be capable of operating in a stable manner and have no adverse effects on power system security during network switching and load restoration. The references in this Section to a demonstrated ability mean that the relevant ability must be demonstrated in accordance with the SRAS Assessment Guidelines SRAS RELIABILITY REQUIREMENTS Primary Restart Service In accordance with the SRS, a primary restart service must achieve at least 90% reliability in any rolling 12- month period Secondary Restart Service In accordance with the SRS, a secondary restart service must achieve at least 60% reliability in any rolling 12- month period How Reliability is Assessed For the purposes of the SRS, the reliability of a service is assessed and determined as the percentage of service availability measured over a 12 month period as follows: Reliability = (Available TI / Total TI) x 100 Where: (a) (b) (c) Available TI is the number of trading intervals an SRAS is Available in a relevant 12-month period; Total TI is the total number of trading intervals in the same period; and an SRAS is Available when the SRAS Equipment is capable of providing the SRAS in accordance with all of the capability requirements specified in the SRAS Assessment Guidelines or (if applicable) a contract with AEMO for the provision of that SRAS. The reliability of primary restart services and secondary restart services can be assessed in relation to a combination of multiple facilities that provide a single SRAS as detailed in Section Combining Services to Meet Reliability Requirements Individual services that do not meet the reliability requirement for a primary restart service or a secondary restart service (as the case may be) may be offered as a combined service, if the SRAS Equipment for each service can be operated so that the relevant reliability requirement can be met over a rolling 12-month period using any of those facilities. For example, assume that two separate facilities meet the technical requirements and have substantially the same capability to restart generation in the same electrical sub-network within the timeframes specified in the SRS. However, each facility only operates for 6 months per year one from October to March and the other from April to September. Individually neither service could meet the 90% reliability requirement for a primary restart service, but in combination each service could substitute for the other during its non-operational period. Alternatively, if multiple generating units or other facilities are required to operate in combination in order to provide the SRAS, each facility should meet the relevant reliability requirement. v1.0 5 September 2014 Page 8 of 28

9 4 SRAS ASSESSMENT GUIDELINES 4 SRAS ASSESSMENT GUIDELINES 4.1 INTRODUCTION This Section 4 contains the SRAS Assessment Guidelines under clause A(e) of the NER. The SRAS Assessment Guidelines set out: (a) (b) (c) how AEMO will model and assess the technical capabilities of SRAS proposed under an EOI or Tender (Sections 4.2 and 4.3); the physical testing requirements for SRAS proposed under an EOI or Tender, or contracted under an ancillary services agreement (Sections 4.4 and 4.5 and Schedule 4.1); and the data, models and parameters of relevant plant and supplementary information that AEMO requires for assessment purposes (Schedules 4.1 and 4.2). For development projects or reconfigurations where proposed SRAS Equipment is not yet built or configured, physical testing is not required, but the assessment process and data requirements are otherwise the same as for proposed SRAS using existing SRAS Equipment. The SRAS Assessment Guidelines apply to both primary restart services and secondary restart services 3. The assessments are the same for both types of SRAS, with some variations for trip to house load (TTHL) schemes. 4.2 GENERAL ASSESSMENT REQUIREMENTS BASIS AND PURPOSE OF ASSESSMENT An assessment of SRAS proposed under an EOI is based on: (a) (b) (c) power system studies including dynamic and load flow analysis performed by AEMO in accordance with Section 4.3, based on Generator Modelling Data; for existing SRAS Equipment, the results of a physical test of the SRAS Equipment conducted in accordance with Section 4.4 (SRAS Test); and an assessment of the supplementary information given by the Service Provider to AEMO, as required by these Guidelines. The purpose of the SRAS assessment is to demonstrate the extent to which the proposed SRAS can, in accordance with the detailed requirements in Schedule 4.1: (a) (b) (c) (d) (e) (f) start reliably without external supply, or trip to house load after a major system disturbance; operate at house load (zero export) for an extended period; control output voltage and frequency within required limits; connect to a de-energised busbar; supply the output specified by the SRAS Provider to the Delivery Point within the timeframe specified by the SRAS Provider; and assist in energising the auxiliaries of other power stations and rebuilding the power system in an identified sub-network to meet the restoration targets in the SRS INFORMATION REQUIRED For the purposes of the SRAS assessment, SRAS Providers must give AEMO the applicable SRAS Test evidence and supplementary information detailed in Schedule 4.1 and the Generator Modelling Data detailed in Schedule A primary restart service has a reliability of 90% or more, a secondary restart service has a reliability of 60% or more. v1.0 5 September 2014 Page 9 of 28

10 4 SRAS ASSESSMENT GUIDELINES If the SRAS Provider is unable to give AEMO all Generator Modelling Data relevant to its offered SRAS, it must give AEMO: (a) (b) a list of the missing data and the reasons why it could not be provided; and any alternative data or assumptions the SRAS Provider considers could be substituted for the missing data, and their source. AEMO will endeavour to substitute the missing data, either as proposed by the SRAS Provider or using data or assumptions that AEMO considers to be more reliable. However, AEMO will take into account the reliability of the substituted data in assessing the results of the power system studies conducted under Section POWER SYSTEM STUDIES OBJECTIVES AEMO will conduct power system studies in relation to proposed SRAS to: (a) (b) (c) (d) (e) (f) (g) verify the capacity of the SRAS to start and supply auxiliaries of other power stations, facilitating a rebuild of the power system. determine which other power stations can be energised subsequent to the SRAS rebuilding sections of the power system. determine the preferred paths to allow energisation of the required sections of the power system. confirm the ability to restore load blocks. qualify the security of the restoration path during credible contingency events. determine potential changes to operating modes and/or control system settings of the SRAS Equipment. determine necessary changes to the settings of protective relays for the SRAS Equipment and transmission network in the energisation path. The power system studies will be based on modelling of the SRAS Equipment, its control systems and protection systems, and relevant network elements including transmission lines, loads, protection systems, dynamic and static reactive support plant and transformers, under black system conditions STUDIES REQUIRED The following studies are envisaged for all proposed SRAS: 1. Steady-state studies (a) Confirm appropriateness of initial operating point including required transformer tap settings. (b) Establish correct initial conditions for dynamic analysis. (c) Confirm voltage variations are maintained within the operational limits for all steps of the restoration plan. 2. Transient studies (a) Load-generation balance. (i) (ii) Confirm adequacy of speed governors. Confirm adequacy of voltage and reactive power control system. (iii) Power station auxiliary motor starting. (iv) Cold load pick up (loads other than those associated with power station auxiliaries. (b) Transient overvoltages (i) Component energisation, e.g. transmission line, transformer, Static Var Compensator, etc. (ii) Harmonic resonance. (iii) Surge arrester duty. 3. Network fault studies v1.0 5 September 2014 Page 10 of 28

11 4 SRAS ASSESSMENT GUIDELINES (a) (b) (c) Verify integrity of the restoration path for credible contingency events. Verify appropriateness of protective relays settings during contingency events. Verify appropriateness of the settings applied to excitation system control and associated limiters PERFORMANCE ASSESSMENT REQUIREMENTS Power System Security Criteria AEMO s assessment will be subject to general principles for maintaining power system security that require the power system to be operated in a secure operating state to the extent practicable. However, the criteria for permissible frequency range will be in accordance with the frequency operating standards for island systems. The supply voltage should remain between ± 10% of normal voltage during the restoration process. However, the voltage must at all times remain within any applicable limits set by the TNSP. A credible contingency event will be assumed in system restoration studies. For all contingency events it is expected that all equipment is secure against damage Generator Performance Standards Generating units are expected to adhere to their registered performance standards. For the purposes of SRAS assessment only, AEMO may accept limited non-compliance with the performance standards to allow for black system conditions and to ensure maximum utilisation of the technical capability of the generating unit during power system restoration. 4.4 SRAS TESTS TRANSITIONAL PROVISIONS For SRAS provided under an ancillary services agreement in effect as at 5 September 2014, each Test as defined in that agreement is to be conducted in accordance with the applicable provisions of the SRAS assessment guidelines that were in force on the date of that ancillary services agreement. The remaining provisions of this clause 4.4 will not apply to tests conducted under those agreements TEST REQUIREMENTS A test conducted for the purpose of demonstrating SRAS capability for an EOI or under an ancillary services agreement must demonstrate the parameters listed in Schedule 4.1. Where an SRAS Test is to be conducted in accordance with an ancillary services agreement, the test must be conducted in accordance with a procedure provided by the SRAS Provider and approved by AEMO. Where applicable the relevant NSP and the owner of the SRAS Equipment (if not the SRAS Provider) must endorse the test procedure prior to AEMO s approval. The test procedure must itemise the steps required to implement the SRAS Test and specify how the requirements and evidence set out in Schedule 4.1 will be demonstrated and recorded. The procedure must also: (a) (b) (c) provide annotated operating diagrams showing the SRAS Equipment and how the SRAS Equipment is isolated and islanded from local supplies and network connections; specify how the evidence for each test item in Schedule 4.1 will be recorded and documented; and address any other matters the SRAS Provider considers relevant. 4.5 TEST REPORT Following an SRAS Test conducted for an EOI, the prospective SRAS Provider must submit a Test Report to AEMO that documents how compliance with the parameters listed in Schedule 4.1 was demonstrated. Following an SRAS Test conducted under an ancillary services agreement, the SRAS Provider must submit a Test Report to AEMO. The Test Report must: (a) document the steps of the test and the results; v1.0 5 September 2014 Page 11 of 28

12 4 SRAS ASSESSMENT GUIDELINES (b) (c) (d) address any deviation from the approved test procedure where applicable; state whether the contracted levels of performance and minimum technical requirements were achieved; and state reasons for any failure to establish any required item under Schedule 4.1 and the remedial actions taken to resolve those matters. v1.0 5 September 2014 Page 12 of 28

13 4 SRAS ASSESSMENT GUIDELINES Schedule 4.1: SRAS Test Requirements and Supplementary Information Item Assessment Capability Test Evidence Required 1a Start (non-tthl) Start without external supply. Start without external supply. 1. Documentation showing all the isolation points at zero volts by measurement. This includes alternating current supplies to battery chargers etc. 2. SRAS starts as per instruction provide output trends of SRAS unit. 1b Trip to House Load Trip to house load from at least 80% of its registered capacity (as registered with AEMO). 2 Timeframes Provide SRAS in specified timeframe. Demonstrate trip operation of TTHL relay to disconnect SRAS from power system. Time to be ready to commence sending out electricity from the SRAS Equipment. Time to reach specified electricity export capability. 3. SRAS remains operational at house load provide output trends of SRAS unit. Record the time at the following milestones over the duration of the SRAS test: 4. Start of the SRAS test. 5. Time at stable operation - ready to energise a de-energised busbar. 6. Time of commencement of the zero export load ability. 7. Times of completion of the zero export load ability. 8. Time of connection to isolated busbar. 9. Time commenced loading. 10. Time at contracted level of performance. 11. Time end of SRAS test. 3 Zero Export Operate in a stable manner at zero export load. Run at zero export load for at least 30 minutes. 12. Frequency and voltage trends (and/or other) to demonstrate the SRAS operated in a stable manner at zero export load for at least 30 minutes. 4 Voltage Control Control SRAS voltage. Change SRAS output voltage by 5% above and below nominal output voltage and hold each change for 5 minutes (measured at generator terminals or other agreed point). Can be done concurrently with item 3. 5 Frequency control Control SRAS frequency. Change SRAS output frequency by 0.5 Hz above and below 50 Hz and hold each change for 5 minutes (measured at generator terminals or other agreed point). Can be done concurrently with item Provide output voltage trend for the duration of the SRAS test. 14. Provide output frequency trend for the duration of the SRAS test. 6 Energise De-energised Busbar Close onto a de-energised busbar. SRAS to close onto a de-energised busbar (or other deenergised electrical equipment agreed by AEMO). 15. Provide voltage trend of for the busbar for the duration of the SRAS test. v1.0 5 September 2014 Page 13 of 28

14 4 SRAS ASSESSMENT GUIDELINES Item Assessment Capability Test Evidence Required 7 Output Capability SRAS to supply specified capability. Synchronise to the network and demonstrate capability to ramp to the specified capability within the specified timeframe. 16. Provide SRAS output trend for the duration of the SRAS test. Supplementary Information 8 Start-up performance Performance over previous 12 months. - Provide evidence of the number of successful starts or TTHL trips in the most recent 12-month period out of the total number of attempted starts or trips. 9 Reliability 4 Availability over previous 12 months. - Demonstrate that SRAS Equipment meets or exceeds the minimum reliability percentage for the proposed service specified in the SRS, determined in accordance with the SRAS Description for the most recent 12-month period. If the SRAS requires multiple generating units to deliver the service, evidence of reliability for each of the units is required. 10 TTHL Relay TTHL relay operation. - Demonstrate and record the TTHL relay functions by injecting signals representing each (all) of the trip conditions - with the outputs of the TTHL relay disabled. The TTHL generating unit is not required to trip for this test. 11 Networks within SRAS (Multiple Site SRAS) Use of external network between SRAS sites. - Demonstrate how the SRAS Provider will manage the use of an external network to provide the SRAS provide procedure or equivalent documentation endorsed by NSP. 4 SRAS Reliability requirements as per Section v1.0 5 September 2014 Page 14 of 28

15 4 SRAS ASSESSMENT GUIDELINES Schedule 4.2: SRAS Generator Modelling Data SRAS Providers must give AEMO the data listed in the following spreadsheet when submitting an EOI to provide SRAS, unless otherwise agreed with AEMO: Refer to Schedule 4.3 SRAS Generator Modelling Data on AEMO s website. v1.0 5 September 2014 Page 15 of 28

16 5 SRAS QUANTITY GUIDELINES 5 SRAS QUANTITY GUIDELINES 5.1 INTRODUCTION This Section 5 contains the SRAS Quantity Guidelines under clause A(f) of the NER. These Guidelines describe the procedure for determining the number, type, and location of SRAS required to be procured for each electrical sub-network, consistent with the SRS. 5.2 NUMBER OF SRAS The number of SRAS that AEMO procures for each electrical sub-network will be based on AEMO s determination of: (a) (b) the quantity of SRAS required to meet the SRS for that electrical sub-network; and the combination of SRAS offered to AEMO that will most efficiently meet that requirement, taking into account the guidelines for specifying diversity and strategic location of SRAS in the SRS. In determining the quantity of SRAS to be procured, AEMO assumes that all network elements will be capable of operating within their technical limits, subject to any operating restrictions applicable in a black system condition and identified by AEMO s power system modelling. 5.3 TYPE OF SRAS The SRAS Procurement Objectives require that the need for SRAS in each electrical sub-network is met, to the extent practicable and reasonable, by AEMO entering into ancillary services agreements for the provision of primary restart services. AEMO will only seek to procure secondary restart services when it has not been possible, based on tenders received, to allocate sufficient primary restart services to an electrical sub-network to meet the SRS. 5.4 LOCATION OF SRAS The location of SRAS that AEMO procures for each electrical sub-network will be based on AEMO s consideration of: the relative ability of the available SRAS for that sub-network to directly or indirectly restore the maximum amount of generation and transmission in the electrical sub-network in the shortest period of time, at locations that will facilitate the restoration of load; and the guidelines for specifying diversity and strategic location of SRAS in the SRS. 5.5 PROCEDURE AEMO will follow an iterative procedure to determine and allocate the appropriate number, type, and location of SRAS for each electrical sub-network. AEMO will: (a) (b) (c) Determine and allocate the best SRAS available to restore and energise the electrical sub-network following a major supply disruption (considering, size, timeframes, location and other relevant characteristics of the SRAS). If the selected SRAS is not sufficient to meet the SRS for that electrical sub-network, select the next best SRAS available (and so on) until a sufficient quantity is procured. Review the outcome in each electrical sub-network against the diversity and strategic location guidelines in the SRS and adjust as far as reasonably practicable to meet those guidelines while still ensuring that sufficient SRAS is procured to meet the SRS. v1.0 5 September 2014 Page 16 of 28

17 6 BOUNDARIES OF ELECTRICAL SUB-NETWORKS 6 BOUNDARIES OF ELECTRICAL SUB-NETWORKS 6.1 INTRODUCTION This Section 6 contains the Boundaries of Electrical Sub-networks under clause B of the NER. AEMO is required to determine the boundaries of the electrical sub-networks into which the power system is to be divided for the purpose of acquiring SRAS and determining and implementing the system restart plan. The boundaries must be determined in accordance with the guidelines set out in the SRS. 6.2 DETERMINATION OF BOUNDARIES Clause 6 of the SRS requires the following factors to be taken into account (without limitation) in determining electrical sub-networks: (a) The number and strength of transmission corridors connecting an area to the remainder of the power system. (b) The electrical distance (length of transmission lines) between generation centres. (c) The quantity of generation in an area, of the order of 1,000 MW or more. (d) The quantity of load in an area, of the order of 1,000 MW or more. AEMO has determined the boundaries of electrical sub-networks as detailed in Schedule 6.1 and shown geographically in Schedule 6.2. The boundaries have been determined at likely break points in the power system, while taking into account all the four factors listed above. v1.0 5 September 2014 Page 17 of 28

18 6 BOUNDARIES OF ELECTRICAL SUB-NETWORKS Schedule 6.1: Boundaries of Electrical Sub-networks BOUNDARIES BETWEEN ELECTRICAL SUB- NETWORKS Qld North and Qld South The boundary between Qld North and Qld South cuts across Calvale Halys 275 kv lines (8810 & 8811), South Pine Palmwoods 275 kv line (808), South Pine Woolooga 275 kv line (807), and South Pine Palmwoods 110 kv lines (745 & 746). Refer to Figure 6.1 for regional view Qld South and NSW The boundary between Qld South and NSW cuts across the interconnectors between Qld and NSW: QNI Bulli Creek Dumaresq 330 kv lines (8L & 8M) and Direct link Terranora Mudgeeraba 132 kv DC lines (DC1, DC2 & DC3). Refer to Figure 6.1 and Figure 6.2 for regional view FACTORS CONSIDERED IN DETERMINING BOUNDARIES NUMBER AND STRENGTH OF TRANSMISSION CORRIDORS CONNECTING TO REMAINDER OF THE POWER SYSTEM AND ELECTRICAL DISTANCE (LENGTH OF TRANSMISSION LINES) BETWEEN GENERATION CENTRES There is one 275 kv double circuit in one transmission corridor, and two single 275kV circuits in another transmission corridor connecting Qld North and Qld South. There is also a weak, low capacity 110 kv parallel system. Loss of western 275 kv corridor with high southerly transfers can result in the loss of the 275 kv eastern corridor. The major generation centre in QLD North electrical sub-network is in Central Qld. One 330 kv double circuit transmission corridor and a DC Direct Link between Qld South and NSW (i.e.: Terranora Mudgeeraba). These transmission corridors link Qld South and NSW. The major generation centre in Qld South electrical sub-network is in South West Qld. GENERATION AND LOAD IN ELECTRICAL SUB-NETWORK (APPROXIMATE FIGURES) Qld North: Generation: 6,500 MW Load: 3,300 MW Qld South: Generation: 7,120 MW Load: 5,650 MW Qld South: Generation: 7,120 MW Load: 5,650 MW NSW: Generation: 17,775 MW Load: 14,750 MW NSW and Vic The boundary between NSW and Vic cuts across Murray Dederang 330 kv lines (67, 68), Wodonga Jindera 330 kv line (060) and a Buronga Redcliffs 220 kv line (0X1). Refer to Figure 6.2 and Figure 6.3 for regional view One 330 kv double circuit transmission corridor, another 330 kv single circuit transmission corridor and a weak 220 kv single circuit transmission corridor connection between Redcliffs and Buronga. The major generation centres in NSW electrical sub-network are in Hunter Valley and Snowy Mountains area. NSW: Generation: 17,775 MW Load: 14,750 MW Vic: Generation: 12,620 MW Load: 10,580 MW v1.0 5 September 2014 Page 18 of 28

19 6 BOUNDARIES OF ELECTRICAL SUB-NETWORKS BOUNDARIES BETWEEN ELECTRICAL SUB- NETWORKS Vic and SA The boundary between Vic and SA cuts across Heywood South-East 275 kv lines (1 & 2) and a DC Murraylink Refer to Figure 6.3 and Figure 6.4 for regional view Vic and Tas The boundary between Vic and Tas cuts across the Vic and Tas ends of DC Basslink. Refer to Figure 6.3 and Figure 6.5 for regional view FACTORS CONSIDERED IN DETERMINING BOUNDARIES NUMBER AND STRENGTH OF TRANSMISSION CORRIDORS CONNECTING TO REMAINDER OF THE POWER SYSTEM AND ELECTRICAL DISTANCE (LENGTH OF TRANSMISSION LINES) BETWEEN GENERATION CENTRES One 275 kv double circuit transmission corridor and a DC link between Vic and SA. The major generation centre in Vic electrical sub-network is in Latrobe Valley. The major generation centre in SA electrical sub-network is in Adelaide. A DC link between Vic and Tas. The DC link requires stable AC sources at both ends for power transfer. Electrical distance is not an applicable factor for a DC link. There are multiple generation centres in Tas electrical sub-network. GENERATION AND LOAD IN ELECTRICAL SUB-NETWORK (APPROXIMATE FIGURES) Vic: Generation: 12,620 MW Load: 10,580 MW SA: Generation: 5,140 MW Load: 3,400 MW Vic: Generation: 12,620 MW Load: 10,580 MW Tas: Generation: 3,020 MW Load: 1,815 MW Note: Any reference to a figure in this schedule refers to that figure in Schedule 6.2. v1.0 5 September 2014 Page 19 of 28

20 6 BOUNDARIES OF ELECTRICAL SUB-NETWORKS Schedule 6.2: Maps showing boundaries of the electrical sub-networks Qld North Qld South Figure 6.1: Electrical sub-networks within Queensland v1.0 5 September 2014 Page 20 of 28

21 6 BOUNDARIES OF ELECTRICAL SUB-NETWORKS Figure 6.2: Electrical sub-networks within New South Wales v1.0 5 September 2014 Page 21 of 28

22 6 BOUNDARIES OF ELECTRICAL SUB-NETWORKS Figure 6.3: Electrical sub-network within Victoria v1.0 5 September 2014 Page 22 of 28

23 6 BOUNDARIES OF ELECTRICAL SUB-NETWORKS Figure 6.4: Electrical sub-network within South Australia v1.0 5 September 2014 Page 23 of 28

24 6 BOUNDARIES OF ELECTRICAL SUB-NETWORKS Figure 6.5: Electrical sub-network within Tasmania v1.0 5 September 2014 Page 24 of 28

25 7 SRAS TENDER GUIDELINES 7 SRAS TENDER GUIDELINES 7.1 INTRODUCTION This Section 7 contains the SRAS Tender Guidelines, which form part of the NMAS tender guidelines defined in clause (a) of the NER. As contemplated in clause (b) of the NER, AEMO has prepared separate NMAS tender guidelines for SRAS and for network support and control ancillary services. The SRAS Guidelines must contain the following (the numbering below corresponds with applicable subclauses in clause (b) of the NER): (1) a requirement for AEMO to call for expressions of interest before issuing an invitation to tender in relation to any required SRAS; (2) a requirement that a person who is required to provide SRAS under an ancillary services agreement has the facility tested in accordance with: (i) the SRAS Assessment Guidelines; and (ii) the timeframes for physical testing referred to in subparagraph (5); (4) a requirement for an NSP or other Registered Participant to assist a prospective tenderer in identifying and, if possible, resolving issues that would prevent the delivery of effective SRAS proposed by a prospective tenderer; (5) the timeframes over which AEMO s assessment of SRAS expressions of interest, SRAS tenders and physical testing of selected SRAS will occur; (7) a requirement for a tenderer to provide data, models and parameters of relevant plant, sufficient to facilitate a thorough assessment of the network impacts and power station impacts of the use of the relevant SRAS; (8) the terms and conditions of the ancillary services agreement that a successful tenderer would be expected to enter into with AEMO; (9) the principles AEMO will apply in assessing SRAS expressions of interest and SRAS tenders; and (10) any other matter considered appropriate by AEMO. v1.0 5 September 2014 Page 25 of 28

26 7 SRAS TENDER GUIDELINES 7.2 SRAS TENDER PROCESS When proposing to acquire SRAS, AEMO will follow the process depicted in Figure 7.1 below, noting that the timeframes depicted in the flowchart are indicative only. 4 Weeks Issue request for EOI EOIs Close Review EOIs Does EOI meet evaluation criteria? NO Consider reasons for non-conformance Can nonconformance be resolved? Weeks YES YES NO Accept or not accept? NO Advise recipient EOI unsuccessful YES Issue ITT 4 Weeks ITTs Close Review ITTs Does Tender meet evaluation criteria in ITT? NO Consider reasons for non-conformance Can nonconformance be resolved? YES YES Weeks Does Tender meet selection criteria in relevant guidelines? YES NO AEMO chooses Preferred Tenderers AEMO executes contracts with Successful Tenderers and advise unsuccessful Tenderers Advise the unsuccessful Tenderers Figure 7.1: Procurement Process for SRAS v1.0 5 September 2014 Page 26 of 28

27 7 SRAS TENDER GUIDELINES Stage One Request for Expression of Interest AEMO will call for EOIs for the provision of SRAS in accordance with a Request for Expressions of Interest, substantially in the form shown in Schedule 7.1. This meets the requirement in clause (b)(1) of the NER. The Request for EOI addresses the following matters as required by clause (b) of the NER 5 : (2) a requirement that a person who is required to provide SRAS under an ancillary services agreement has the facility tested in accordance with: (i) the SRAS Assessment Guidelines; and (ii) the timeframes for physical testing referred to in subparagraph (5); (5) the timeframes over which AEMO s assessment of SRAS expressions of interest, SRAS tenders and physical testing of selected SRAS will occur; (7) a requirement for a tenderer to provide data, models and parameters of relevant plant, sufficient to facilitate a thorough assessment of the network impacts and power station impacts of the use of the relevant SRAS; (9) the principles AEMO will apply in assessing SRAS expressions of interest and SRAS tenders. Other appropriate matters are also addressed in the Request for EOI as permitted by clause (b)(10) of the NER. On receipt of EOIs, AEMO will conduct an administrative and technical assessment of each EOI in accordance with the evaluation criteria in the Request for EOI. As such, the technical solution put forward in a Tender should mirror that which is put forward in the relevant SRAS Provider s EOI. Stage Two Invitation to Tender AEMO will forward ITTs to SRAS Providers that AEMO, in its sole discretion, determines have satisfied the assessment criteria outlined in the Request for EOI. AEMO may also forward ITTs to potential SRAS Providers that do not satisfy the criteria outlined in the Request for EOI or have not submitted an EOI in its sole discretion, but is not bound to do so. An ITT will be substantially in the form shown in Schedule 7.2. The ITT addresses the following matters as required by clause (b) 6 of the NER: (5) the timeframes over which AEMO s assessment of SRAS expressions of interest, SRAS tenders and physical testing of selected SRAS will occur; (7) a requirement for a tenderer to provide data, models and parameters of relevant plant, sufficient to facilitate a thorough assessment of the network impacts and power station impacts of the use of the relevant SRAS; (8) the terms and conditions of the ancillary services agreement that a successful tenderer would be expected to enter into with AEMO; (9) the principles AEMO will apply in assessing SRAS expressions of interest and SRAS tenders. Other appropriate matters are also addressed in the ITT as permitted by clause (b)(10) of the NER. The proposed ancillary services agreement, which forms part of the ITT, is set out in Schedule 7.3. On receipt of Tenders, AEMO will evaluate each one against the evaluation criteria in the ITT. 7.3 ASSISTANCE BY OTHERS Clause (b)(4) of the NER requires an NSP or other Registered Participant to assist an SRAS Provider in identifying and, if possible, resolving issues that would prevent the delivery of effective SRAS. In accordance with clause (f)(1) of the NER, AEMO expects NSPs to negotiate in good faith with SRAS Providers on any issues pertinent to the provision of SRAS which an SRAS Provider wishes to discuss and resolve with that NSP. In addition, it is AEMO s expectation that, if nominated SRAS Equipment is not owned or operated by the SRAS Provider, the affected Generator will assist by providing information and assistance as to the efficacy of the nomination. 5 Reflects the numbering in the NER. 6 Reflects the numbering in the NER. v1.0 5 September 2014 Page 27 of 28

28 7 SRAS TENDER GUIDELINES In accordance with clause (f)(2) of the NER, if it would not be reasonable and practicable for an NSP to participate in, or facilitate testing of a proposed SRAS, the SRAS Provider might need to redefine the proposed SRAS so that its testing does not require NSP participation or facilitation. 7.4 CONTRACT TERM Although AEMO is not required to specify the period over which SRAS may be contracted, AEMO considers it preferable to provide guidance to SRAS Providers on this matter. For the procurement of SRAS commencing from 1 July 2015, AEMO intends to seek prices from SRAS Providers based on a three-year contract term plus an option to extend for up to one year, and a further option to extend for another year subject to agreement by the SRAS Provider. AEMO intends to review this guidance for subsequent SRAS procurement processes. AEMO may, in its sole discretion, offer an alternative contract term if it considers it appropriate to do so in the circumstances. 7.5 DISPUTES A dispute concerning any aspect (other than price) of a Tender for SRAS must be dealt with in accordance with clause 8.2 of the NER. Schedule 7.1 Request for Expressions of Interest Refer to Schedule 7.1 Request for Expression of Interest on AEMO s website. Schedule 7.2 Invitation to Tender Refer to Schedule 7.2 Invitation to Tender on AEMO s website. Schedule 7.3 SRAS Agreement Refer to Schedule 7.3 SRAS Agreement on AEMO s website. v1.0 5 September 2014 Page 28 of 28