Generator Performance Standards Consultation Paper

Transcription

1 Generatr Perfrmance Standards Cnsultatin Paper Dcuments under cnsultatin: Netwrk Technical Cde 4.0 System Cntrl Technical Cde v6.0 Secure System Guidelines v December 2018 Submissins due by 8 February 2019 Cnsultatin authrisatin Ms Djuna Pllard As Netwrk Operatr n behalf f Pwer and Water Crpratin as Netwrk Licence hlder Mr Malclm Cnway As System Cntrller n behalf f Pwer and Water Crpratin as System Cntrl Licence hlder

2 Cntents Cnsultatin Paper... 1 Cntents f NTC cnsultatin paper... 2 Cnsultatin Prcess... 3 Wh is cnducting the cnsultatin... 3 Pwer t cnsult... 3 Dcuments under cnsultatin... 3 Invitatin t make a submissin... 3 Summary f NTC revisin prcess... 5 Summary f SCTC amendment prcess... 6 Cnsultatin questins... 7 Netwrk Technical Cde... 7 System Cntrl Technical Cde... 7 Attachments... 8 References... 8 Appendix A... 9 Definitins... 9 Abbreviatins... 9 Appendix B Abut this Cnsultatin Paper Abut the Netwrk Operatr Abut the Netwrk Technical Cde Abut the Netwrk Planning Criteria Abut the System Cntrller Abut the System Cntrl Technical Cde Abut the Secure System Guidelines Abut the Utilities Cmmissin Duratin f cnsultatin Submissins Appendix C Netwrk Technical Cde changes Impacts n Users Prpsed Cde Amendment List f Cde amendments Appendix D System Cntrl Technical Cde changes Impacts n System Participants & Netwrk Users Prpsed Cde Amendments Secure System Guidelines Incident Reprting Guideline List f Cde amendments

3 Cnsultatin Prcess Wh is cnducting the cnsultatin Pwer and Water hlds the netwrk peratr and system cntrller licences fr the NT. The fllwing peple have a rle in the cnsultatin prcess n behalf f the rganisatin: Ms Djuna Pllard, as Netwrk Operatr. Mr Malclm Cnway, as System Cntrller. Ms Jdi Triggs, as Market Operatr. The Market Operatr is cnducting the cnsultatin prcess n behalf f the Netwrk Operatr and the System Cntrller. Pwer t cnsult The pwer t cnsult n the Netwrk Technical Cde ( NTC ) is derived frm the Electricity Refrm Act, clause 66A(5). The pwer t cnsult n the System Cntrl Technical Cde ( SCTC ) is als derived frm the Electricity Refrm Act, clause 38(1), and the Electricity Refrm (Administratin) Regulatins, clause 5A(3). The System Cntrller is publishing the amended SCTC and Secure System Guidelines ( SSG ) in accrdance with bligatins cntained in clause f the SCTC. Dcuments under cnsultatin The fllwing dcuments are under cnsultatin: 1. The Netwrk Technical Cde. The revised NTC will have significant implicatins fr System Participants, Netwrk Users and Pwer and Water, as its mdificatins reflect upgraded technical cnnectin requirements. 2. The System Cntrl Technical Cde. The revised SCTC will have minimal implicatins fr System Participants, Netwrk Users wh nt System Participants (un-licenced Netwrk Users), and Pwer and Water. This is because its amendments reflect either requirements currently impsed by the NTC r are unrelated editrials which have been included t imprve readability f the dcument. In ttal there are apprximately 20 clauses and 15 Glssary definitins impacted by this revisin (excluding multiple instances f a cmmn term). 3. Secure System Guidelines. The revised SSG has n impact fr System Participants, Netwrk Users and Pwer and Water. This is because it merely invlves adding the term technical envelpe t the definitins, and changing that term, as used in the bdy f the dcument, t italic frmat. Invitatin t make a submissin Cnsistent with the requirement t cnsult: the Netwrk Operatr seeks t invlve all relevant parties in the revisin prcess, including all System Participants, Users and ther interested peple. Cnsequently, submissins are invited frm all parties wh have an interest in the dcument. the System Cntrller seeks t invlve all relevant peple in the amendment prcess, including System Participants, Netwrk Users wh are nt System Participants, and ther interested peple. Cnsequently, submissins are invited frm all parties wh have an interest in the dcument. A single submissin shuld be prvided t the Market Operatr in respnse t this Cnsultatin Paper by: 2pm, Friday 8 February Earlier submissins are welcme. The submissin shuld be sent electrnically in pdf frmat. Please cntact the Market Operatr if an alternate 3

4 methd f delivery is required. Fr the avidance f dubt, cmments n the NTC revisins shuld be included within the same dcument as any cmments n the SCTC amendments s that nly ne submissin fr bth dcuments under cnsultatin is presented t the Market Operatr. Enquiries n any aspect f the NTC mdificatins shuld be addressed t: Netwrk Operatr Pwer and Water Crpratin Attentin: Djuna Pllard Executive General Manager Netwrk Services market.peratr@pwerwater.cm.au Enquiries n any aspect f the SCTC mdificatins shuld be addressed t: System Cntrller Pwer and Water Crpratin Attentin: Mr Malclm Cnway General Manager System Cntrl market.peratr@pwerwater.cm.au Upn receipt f the submissin, a cnfirmatin f receipt will be issued. It is the submitter s respnsibility t ensure successful delivery f its submissin shuld a receipt nt be received. Fllwing receipt f submissins, representatives f the Netwrk Operatr and the System Cntrller will review the cmments prvided and prepare a summary reprt detailing all submissins, the final decisins and utcmes. The summary reprt will be sent t each persn wh made a submissin as well as being published n the Pwer and Water Crpratin s website 1. Pwer and Water reserves the right t include the NTC, SCTC and SSG summary details in the ne reprt, r t prvide individual summary reprts fr the NTC and SCTC. The revised NTC will be packaged with the amended SCTC and SSG, alng with the Feedback Reprt(s) and submitted t the Utilities Cmmissin fr apprval. 1 The summary reprt will be published n the Market Operatr page. 4

5 Summary f NTC amendment prcess The NT Gvernment is undertaking a suite f refrms t prmte renewable energy in the NT electricity supply industry, and t accmmdate the grwing number f prpnents wh have expressed interest in cnnecting t the NT pwer systems. The NT Gvernment recgnised that an alignment f regulatry arrangements with thse perating in the Natinal Electricity Market, where pssible, will reduce the barriers t entry fr investrs. The transitin path t a cmmercial market will ccur as the market develps, bringing further changes t the NTC and SCTC thse changes have been excluded frm the dcuments under review in this rund f cnsultatin. One f the shrt-term actins is t mdify the netwrk cnnectin prcess t accmmdate the characteristics f large-scale renewable technlgies and increasing penetratin f renewable energy while maintaining pwer system security and reliability. This actin was specified in 4(c) f the NT Gvernment s Renewable Energy and Electricity Market Refrm Implementatin Plan Pwer and Water was assigned this actin. Amng the key principles f the NT Gvernment s Radmap t Renewables is a requirement t maintain energy security, reliability and stability during the transitin t renewable energy. In supprting these principles, the Netwrk Operatr and System Cntrller, tgether, have applied a d n harm apprach in setting the perfrmance requirements fr new generatrs. In simple terms, new generatrs that enter the NT market that displace existing generatrs will need t prvide sme f the perfrmance attributes f generatrs displaced. This apprach is similar t that taken by the Australian Energy Market Cmmissin (AEMC) in its suite f recent rule changes that supprt the increasing penetratin f renewable energy. Hence, the prpsed apprach is t adpt new generatr perfrmance standards that are largely based n the Natinal Electricity Rules (NER) Chapter 5 Schedule 5.2 except where adptin may impse unnecessary r unjustified csts that may be brne by cnsumers. In the case f the latter, adaptatin f the NER equivalent standard was applied t suit NT circumstances in particular the scale f the pwer system cmpared t the NEM. This apprach f mdifying the prvisins f Schedule 5.2 where the csts f adptin may utweigh the benefits and t reflect Territry circumstances is intended t ensure cnsistency with the Territry s apprach t applying the NER t ensure it prvides a fit-fr-purpse regulatry framewrk fr the Territry. Cnsequently, Pwer and Water, as the Netwrk Operatr, is revising the NTC: 1. t incrprate the Generatr Perfrmance Standards as specified in Actin 4(c) f the NT Gvernment s Renewable Energy and Electricity Market Refrm Implementatin Plan The Generatr Perfrmance Standards are largely based n the NER Schedule 5.2 Cnditins fr Cnnectin f Generatrs (als referred t as Generatr Cnnectin Requirements). 2. by remving duplicatin and simplify regulatins acrss the tw cdes (NTC & SCTC); 3. t ensure alignment f the Netwrk Technical Cde with the NER requirements that will be prgressively adpted; and 4. in readiness fr further changes t the electricity market in the Nrthern Territry. The changes in the NTC are cncentrated arund clauses 3.3 Requirements fr cnnectin f generatrs, 4.0 Pwer System Security, and 9.0 Operatin f Generatrs cnnected t the Netwrk. The changes impact n Users in the Darwin-Katherine, Tennant Creek and Alice Springs pwer systems. This Cnsultatin Paper utlines the material changes that have been made t the NTC. The current NT electricity netwrk cnnectin prcess is fund in the Pwer and Water dcument Netwrk Technical Cde and Netwrk Planning Criteria, versin 3.1 dated December The Gvernment s Implementatin Plan actin has prgressed by Pwer and Water t the pint where the generatr perfrmance standards can nw be incrprated in a revised NTC. Fr the shrt term the Gvernment prpses t use the existing regulatry framewrk, primarily the NTC as the legal instrument t accmmdate cnnectins that recgnise the cntributins and cnstraints f renewable technlgies abve a capacity (as specified in Sectin 19 f the SSG) which must be registered with 5

6 the System Cntrller. Cnsequently, the Netwrk Operatr prpses t: update the verall generatr perfrmance standards in Sectin 3.3 f the NTC t thse used in the NEM, where pssible; and remve verlap and duplicatin between the NTC and System Cntrl dcuments. It is nted that the material n Netwrk Planning Criteria has nt been changed, ther than ne minr editrial in clause The NTC will cntinue t be used as the regulatry instrument t manage netwrk cnnectins t the regulated pwer systems until it is superseded by Chapter 5 f the Nrthern Territry Natinal Electricity Rules. In this revisin, sme elements f the NTC will be transferred t the SCTC and/r the SSG, requiring cnsultatin n thse dcuments t allw the mdified elements t be frmally adpted in their new hme. Accrdingly, the amended SCTC and SSG will be circulated as part f the NTC cnsultatin package. Summary f SCTC amendment prcess The System Cntrller is amending the SCTC: 1. t assist in remving duplicatin and incnsistency during the NTC revisin, including prviding clarity arund the bligatins n Users wh cnnect t the electricity netwrk but are nt required t be licenced t perate at that cnnectin pint by the Utilities Cmmissin; 2. making editrial changes t the Plant Numbering, Nmenclature and Drawings clause (clause 6.14) t align mre clearly with the Glssary definitin f nmenclature; and 3. making a few minr editrial changes t imprve reading clarity. N change has been made t the current arrangements fr the Interim Nrthern Territry Electricity Market (I- NTEM) in the Darwin-Katherine pwer system. N change is prpsed t the current arrangements fr the Tennant Creek and Alice Springs pwer systems. This Cnsultatin Paper utlines the changes that have been made t the SCTC and the SSG. The changes made t the SCTC are detailed in Appendix D. Because they have arisen as a result f the revisin f the NTC, the changes need t be viewed in the cntext f that dcument. Nte 1: The Secure System Guidelines have been mdified (t a minr extent) alngside the SCTC as part f the NTC revisin. Whilst it has been included in the cnsultatin package at this time fr cmpleteness and transparency. The changes are explained belw in Appendix D. Further changes (which will trigger a frmal cnsultatin prcess) will be made t the SSG nce the changes t the SCTC are apprved. Nte 2: a further tw revisins f the SCTC are expected t be cnducted during One is t cater fr changes t the I-NTEM t transitin the market twards the NTEM. The secnd is t address editrials that the System Cntrller cnsiders need attentin but wuld distract frm cnsultatins that were driven by the NTC and NTEM updates. The sequence f these tw additinal cnsultatins will be subject t timing cnsideratins. Nte 3: the SCTC will cntinue t be used as the regulatry instrument t implement the electricity market arrangements at least in the shrt term. Hwever, n market arrangements have been altered in the SCTC t supprt the NTC cnsultatin prcess. 6

7 Cnsultatin questins Netwrk Technical Cde In frming respnses t the prpsed NTC amendments stakehlders are invited t view them against the infrmatin that has been transferred t the SCTC, as well as the existing SCTC prvisins. Stakehlders are particularly invited t cmment n whether: the prpsed changes t the NTC (that are largely based n the Natinal Electricity Rules (NER) Chapter 5 Schedule 5.2), are apprpriate fr the Territry and where they are different t the NER, whether this is apprpriate and why; the prpsed changes t the NTC are likely t prvide the least cst t Territry end use custmers while meeting the bjectives f the NT Radmap t Renewables f increasing the level f renewable energy while maintaining energy security, reliability and stability; the prvisins that have been transferred frm the NTC t the SCTC have been adequately stated in the SCTC; the prvisins in the NTC that have been deleted (that is, nt relcated in the SCTC, r earmarked fr lcatin in anther System Cntrl dcument), are n lnger required; any duplicatin between the NTC and the SCTC remains; any incnsistency between the NTC and the SCTC is evident; any gaps have arisen in the transfer f infrmatin t the SCTC, r in its deletin; and the prpsed NTC prvisins can be expressed in a mre user-friendly manner. System Cntrl Technical Cde In frming respnses t these prpsed SCTC amendments stakehlders are invited t view them in the cntext f the NTC revisin. Stakehlders are particularly invited t cmment n whether: any duplicatin between the NTC and the SCTC remains; the prvisins transferred frm the NTC have been adequately stated in the SCTC if they are still relevant; any gaps have arisen in the transfer (r lack f transfer) f infrmatin t the SCTC; and the prpsed SCTC prvisins can be expressed in a mre user-friendly manner. In particular, the fllwing questin is aimed t guide the respnses fr this cnsultatin prcess: 1. Issue: The NTC makes extensive use f the term User. This term desn t integrate easily within the current versin f the SCTC. An apprach has been taken by rewrking clause f the SCTC t retain the use f the term System Participant as the key entity t which the System Cntrller has a direct relatinship with (as per the Act and the Regulatins). Nting that the Netwrk Operatr is a System Participant, and that party als has a cntract (access agreement) with Users, and in particular un-licenced users, the Netwrk Operatr can act as an interface between the System Cntrller and this classificatin f User. Refer als t the nte in clause 3.3.1(s). Questins: (a) d the changes in SCTC clause and the nte in clause 3.3.1(s) adequately reflect the current range f requirements (fr example, where it is stated that the System Cntrller can direct a User) laid ut in the NTC? (b) As a result f the changes t clauses 3.3.1(s) and 3.3.3, d the prvisins f the SCTC wrk as intended fr relevant un-licenced Netwrk Users. 7

8 Attachments The fllwing attachments are prvided with this Cnsultatin Paper: Netwrk Technical Cde, revisin 4 dated December 2018, as amended by the prpsed changes. This versin includes the netwrk technical cde (Part B) and the netwrk planning criteria (Part C). System Cntrl Technical Cde, versin 6.0 dated December 2018, as amended by the prpsed changes. Secure System Guidelines versin 4.1, published December References NT Electricity Refrm Act. NT Electricity Netwrks (Third Party Access) Act and its embedded Electricity Netwrks (Third Party Access) Cde. Netwrk Technical Cde and Netwrk Planning Criteria, revisin 3.1, apprved by the Utilities Cmmissin in It can be fund n the Pwer and Water website at: netwrk_cnnectin_technical_cde_and_planning_criteria System Cntrl Licence, issued t Pwer and Water, as varied 03 April It can be fund n the Utilities Cmmissin web site at: Exemptins.aspx System Cntrl Technical Cde, versin 5.0 dated May 2015, apprved by the Utilities Cmmissin in It can be fund n the Utilities Cmmissin web site at: Secure System Guidelines versin 4, published in July It can be fund n the Pwer and Water website at: elines Alternatively, a cpy f the current Secure System Guidelines, versin 4 (excluding participant-specific sectins), may be btained directly frm the System Cntrller. 8

9 Appendix A Definitins The fllwing definitins are prvided frm cnvenience. A full Glssary f definitins can be fund in the NTC and the SCTC. Netwrk Access Cde the Electricity Netwrks (Third Party Access) Cde set ut in the Schedule t the Electricity Netwrks (Third Party Access) Act. [NTC] Netwrk Operatr A bdy defined as a netwrk prvider in the Electricity Netwrks (Third Party Access) Act. The Netwrk Operatr prvides access services in respect f Pwer and Water s electricity netwrk. Netwrk User a persn wh has been granted access t the electricity netwrk by the netwrk prvider in rder t transprt electrical energy t r frm a particular pint. [Electricity Refrm Act] User a persn, whether a lad User r a Generatr User, wh has been granted access t the electricity netwrk by the Netwrk Operatr in rder t transprt electrical energy t r frm a particular pint. [NTC] System Participant a persn r bdy, licenced by the Utilities Cmmissin, wh inputs, transprts, cntrls, perates r takes electricity frm any part f a pwer system. [SCTC] Abbreviatins NTC I-NTEM NTEM NEM SCTC SSG System Cntrller Netwrk Technical Cde, therwise titled Netwrk Technical Cde and Netwrk Planning Criteria and published by Pwer and Water. Interim Nrthern Territry Electricity Market Nrthern Territry Electricity Market (end-state f market design) Natinal Electricity Market System Cntrl Technical Cde published by Pwer and Water. Secure System Guidelines published by Pwer and Water. An abbreviatin fr the term Pwer System Cntrller which is used in the NTC and SCTC. The abbreviatin represents the definitin as prescribed in the Electricity Refrm Act fr the purpse f this Cnsultatin Paper (ther than when a clause in the SCTC is being discussed). It is expected that the term Pwer System Cntrller will be replaced by System Cntrller when the NTC is replaced by an equivalent Chapter f the NT NER. 9

10 Appendix B Abut this Cnsultatin Paper The Pwer and Water Crpratin ( Pwer and Water ) is cnducting cnsultatin n its dcument titled Netwrk Technical Cde and Netwrk Planning Criteria (als knwn as the Netwrk Technical Cde, and fr this paper the NTC ) and the System Cntrl Technical Cde ( SCTC ) as utlined in this Cnsultatin Paper and detailed in Appendix C (fr the NTC) and Appendix D (fr the SCTC). The fcus f the cnsultatin is n changes t the NTC versin 3.1 dated December The Netwrk Operatr is respnsible fr his dcument. The NTC cntains tw parts, a netwrk technical cde and a netwrk planning criteria. Material changes have nly been made t the netwrk technical cde cntent. In making the changes, sme minr technical matters impacted n the SCTC versin 5 dated May The System Cntrller is respnsible fr this dcument. The SCTC is supprted by the Secure System Guidelines (SSG). The cnsultatin package cntains the NTC, the SCTC and the SSG. The minr technical changes t the SCTC have prvided an pprtunity t make sme ther changes t the SCTC which are editrial in nature t imprve reader clarity. The change t the SSG is f an administrative nature and nly requires awareness, nt frmal cnsultatin. Abut the Netwrk Operatr Pwer and Water is licenced by the Utilities Cmmissin t perate three regulated electricity netwrks and a number f nn-regulated electricity netwrks. The Licence allws Pwer and Water t perfrm the functins f the Netwrk Operatr in thse netwrks. The Netwrk Operatr s rle is t prvide access services t parties wh request t cnnect t the Pwer and Water netwrks. Abut the Netwrk Technical Cde The Netwrk Technical Cde is prepared in accrdance with clause 66A(2) f the Electricity Refrm Act. It cnsists f tw cnstructins, the netwrk technical cde and the netwrk planning criteria. In this Cnsultatin Paper, the term Netwrk Technical Cde ( NTC ) refers t bth cnstructins. Part B netwrk technical cde f the NTC cntains the requirements fr access t Pwer and Water s electricity netwrk. Abut the Netwrk Planning Criteria Part C netwrk planning criteria f the NTC specifies the criteria t be used fr assessing plant and equipment perfrmance and respnse t pwer system events. The netwrk criteria cvers matters such as plant and netwrk perfrmance t supprt frequency events, vltage events, stability events, system reserve, reliability f supply and quality f supply. Abut the System Cntrller Pwer and Water is licenced by the Utilities Cmmissin t perfrm the functins f the System Cntrller. The System Cntrller s functins are established under sectin 38 f the Electricity Refrm Act. The System Cntrller is respnsible fr the SCTC and the SSG. The System Cntrller s rle is t mnitr and cntrl peratin f regulated pwer systems in the Nrthern Territry t achieve safety, security, reliability and efficiency f pwer system peratins fr the assciated cmmunities. Abut the System Cntrl Technical Cde The System Cntrl Technical Cde ( SCTC ) is prepared in accrdance with sectin 38(1) f the Electricity Refrm Act and clause 15 f the System Cntrl Licence. The SCTC is a dcument that sets ut perating prtcls, arrangements fr security and dispatch, arrangements fr discnnectin, and any ther matters relating t mnitring, peratin and cntrl f regulated pwer systems, which the System Cntrller 10

11 cnsiders apprpriate fr the reliable, safe, secure and efficient peratin f the pwer systems. Abut the Secure System Guidelines Established under clause 3.5 f the SCTC, the Secure System Guidelines set ut the principles and details fr determining whether the pwer system is in a secure state. The dcument is sectinalised, including a sectin devted t verarching pwer system parameters, and participant-specific sectins fr ptentially cmmercial-in-cnfidence r ring-fenced infrmatin. The participant-specific sectins are develped n an as-needs basis. The System Cntrller may amend, vary r replace the Secure System Guidelines at any time, and shall cnsult with participants when ding s. Abut the Utilities Cmmissin The Utilities Cmmissin has advised it intends t cnduct parallel cnsultatin n these changes and may refer t this dcument. Duratin f cnsultatin The cnsultatin fr bth dcuments pens n Tuesday 18 December 2018 and clses at 2:00 pm NT time n Friday 8 February Submissins received after this date may nt be cnsidered in this rund f cnsultatin, at the discretin f the Netwrk Operatr r the Pwer System Cntrller, as apprpriate. Submissins Submissins n bth the NTC and SCTC are t be cmbined int ne dcument. The submissin is t be in electrnic pdf unless therwise requested. The submissins are t be sent t the fllwing address: market.peratr@pwerwater.cm.au 11

12 Appendix C Netwrk Technical Cde changes Impacts n Users The impact n the Netwrk Operatr and Users: Users: the impact n the User ccurs in clauses 3.3 Requirements fr cnnectin f Generatrs, with minr changes t clause Obligatin n Generatr Users, Transient rtr angle stability, 3.2 Requirements fr all netwrk Users, chapter 4.0 Pwer system peratin supprt, chapter 9.0 Operatin f Generatrs cnnected t the netwrk, and clause 16.3 Frequency stability criteria. Netwrk Operatr: the impact n the Netwrk Operatr ccurs in Chapters 4.0 Pwer system peratin supprt and 9.0 Operatin f Generatrs cnnected t the netwrk. The purpse f clause 3.3 is t set ut details f requirements and cnditins that new Generatrs r generatrs mdifying existing plant must satisfy as a cnditin f cnnectin f a generating system t the pwer system. The clause has been rewritten t fllw as clse as pssible the structure f the NER Schedule 5.2. Fr example, paragraph (a) f clause Outline f requirements f the NTC mirrrs the prvisin in paragraph (a) f Schedule Outline f requirements f the NER. The impacts assciated with clause 3.3 where there is an increase in requirements r a new requirement t meet in regard t the cnnectin f new r mdificatin t existing generatrs can be summarised as fllws: General requirements: Clause a new descriptin that describes the circumstances and prcess fr prpsing a negtiated access standard in lieu f meeting the autmatic access standard. Clause a cmmn requirement fr all generatr technlgies fr reactive pwer capability. Clause a new requirement fr generatrs t nt adversely affect system strength and be respnsible fr any remedial csts if there is an adverse impact. Clause references t nn-scheduled and semi-scheduled generatrs have been remved as the intentin is fr all new generatrs cnnecting under clause 3.3 t be classified as scheduled. This is explained further in the SCTC amendments. Requirements that generatrs must remain in cntinuus peratin: Clause an increased vltage time withstand capability Clause a new requirement t withstand vltage quality at the cnnectin pint as utlined in clauses 2.4.1, and Requirements regarding the supprt t the pwer system that generatrs need t prvide during and pst netwrk cntingency events: Clause a new requirement fr generatrs t prvide reactive current t supprt pwer system vltage levels during cntingency events f 2 times maximum pwer rating fr asynchrnus generatrs and 2.5 times fr synchrnus generatrs. Clause a new requirement fr generatrs t be capable f prviding measurable amunts f frequency cntrl ancillary services (FCAS). Clause a new requirement fr generatrs t prvide inertia r cntingency FCAS r 12

13 a cmbinatin f bth. The impacts assciated with Chapters 4 and 9 can be summarised as fllws: Chapter 4: largely n verall material impact n the Netwrk Operatr and User, mainly because many f the prvisins are duplicated in the SCTC, where they are better represented this allwed the NTC prvisin t be deleted. Specific impacts n the entities are as fllw: Clause Netwrk Operatr. Paragraph (f). The Netwrk Operatr is required t cnsult with the relevant user and as applicable, the Pwer System Cntrller Clause Netwrk Operatr. Paragraph (g). The Netwrk Operatr in cnjunctin with the Pwer System Cntrller is required t arrange cntrls, mnitring and secure cmmunicatin systems. Clause Netwrk Users. Paragraph (d). Users are t be infrmed f their interruptible lad blcks by the Pwer System Cntrller rather than the Netwrk Operatr. Clause Netwrk Vltage Cntrl. Paragraph (e) added (new) t require the limits specified in paragraph (c) t be recrded in the SSG. Clauses 4.6 & 4.7. mdified in the NTC t fcus n un-licenced Users. Clause 4.9 Nmenclature standards. The full prvisin has been transferred t SCTC clause 6.14, with the prvisin replaced by a crss-reference t the bligatins in the SCTC. There is n verall impact n the Netwrk Operatr r the User. In ther instances, the current NTC prvisin is retained in the NTC, largely unaltered. Sectin 9: There are n impacts n Users as a result f the deletin f the prvisin in clauses and Status qu Cde prvisins The revised NTC makes n change t the prvisins in the fllwing sectins and clauses: Part A Legislative Requirements. N changes are intrduced. Part B Netwrk Technical Cde : Sectins 1 Applicatin. N changes, except fr a minr editrial t clause Obligatins n Generatr Users. Sectin 2 Netwrk Perfrmance Standards. N changes, except fr deletin f clause Transient rtr angle stability, which is superseded by clause Sectin 3 Technical Requirements fr Equipment Cnnected t the Netwrk. N changes, except fr clause 3.3 Requirements fr cnnectin f Generatrs, which has been replaced. Sectin 4 Pwer System Operatin Supprt. N changes t thse prvisins nt detailed in Table 1: Amendments t NTC. Sectin 5 Testing f Plant and Equipment. N changes. Sectin 6 Cntrl and Prtectin Settings. N changes. Sectin 7 Cmmissining and Testing Prcedures. N changes. Sectin 8 Discnnectin and Recnnectin f Plant and Equipment. N changes. Sectin 9 Operatin f Generatrs Cnnected t the Netwrk. N changes, except fr deletin f clauses & Sectin 10 Metering Requirements. N changes, ther than t state that the sectin will be superseded by Chapter 7A f the NT NER n 1 July

14 Part C Netwrk Planning Criteria. N changes, except fr a minr editrial t clause 16.3 Frequency stability criteria. Part D Attachments. N changes. A full list f changes is recrded in Table 1: Amendments t NTC Prpsed Cde Amendment It is prpsed that the NTC be amended in the manner marked up in the attached draft versin 4, as summarised in the fllwing way: Cnnectin f Generatrs Clause 3.3 f the NTC has been entirely replaced by the prvisins in NER clause S5.2. These prvisins specify the autmatic standards fr generatrs cnnecting t the regulated netwrks in the NT. The previus clauses t have been replaced with clauses t , as included in Table 1. Pwer System Operatinal Supprt Clause 4 f the NTC has been substantially reduced fr the fllwing reasns: Sme f the prvisins have been transferred t System Cntrl dcuments (SCTC, SSG and / r Guidelines) in full r in part r by intent. These prvisins have been deleted frm the NTC. Sme f the prvisins are currently adequately accmmdated in System Cntrl dcuments and hence represent a duplicatin. These prvisins have been deleted frm the NTC. Sme f the prvisins have been retained in the NTC with mdificatins t better address current arrangements. Sme f the prvisins have been retained in the NTC withut any mdificatin. The effect n each sub-clause is as shwn in Table 1. Operatin f Generatrs Clause 9 f the NTC has been mildly reduced fr the fllwing reasns. One prvisin was transferred t the SCTC in part. This prvisin have been deleted frm the NTC. One prvisin has been deleted as it is n lnger relevant. The balance f the prvisins have been retained in the NTC withut any mdificatin. The effect n each sub-clause is as shwn in Table 1. Metering Clause 10 f the NTC has been ear-marked as being superseded by Chapter 7A f the NT NER n 1 July Other amendments A few editrial amendments have been made t ther NTC clauses as listed in Table 1. 14

15 List f Cde amendments Sectins f the Cde where amendments are prpsed are listed belw with a brief cmment n the nature f the amendments and in sme instances hw they implement features f the I-NTEM design described earlier. Table 1 amendments t NTC NTC Clause 1.7.3(a)(1) Descriptin f prpsed amendment Obligatins f Generatr Users: Editrial reference t clause 3.2 deleted Transient rtr angle stability: Transferred t clause pening paragraph 3.3 (mdified) (mdified) (mdified) (mdified) (new) (new) Requirements fr all netwrk Users: new paragraph added. Excludes generatr Users that are captured under clause 3.3. Requirements fr cnnectin f Generatrs: Prvisins replaced by thse in NER Schedule 5.2 Cnditins fr cnnectins f generatrs. Opening paragraphs (a) t (f) replaced by a single summary paragraph. Outline f Requirements: Existing pening paragraphs (a) t (e) and sub-clause n Prtectin requirements replaced by the material prvisins in NER S Applicatin f settings: Existing pening paragraphs (a) t (e) and sub-clauses t n Technical characteristics replaced by the material prvisins in NER S Technical matters t be c-rdinated: Existing sub-clauses t n Mnitring and cntrl requirements replaced by the material prvisins in NER clause S Prvisin f infrmatin: Existing clause 11.3 Infrmatin t be prvided by Users with Generatrs transferred t this lcatin with suitable editrial adjustments t align with NER clause S Technical requirements: Incrprate the prvisins f NER clauses S5.2.5 & 5.3.4A (b1) & (b2) as new pening paragraphs Reactive Pwer Capability: Incrprate the prvisins f NER clause S with suitable amendments fr the NT t incrprate existing NTC average pwer factr ranges Quality f Electricity Generated: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Generating Unit Respnse t Frequency Disturbance: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Generating System Respnse t Vltage Disturbances: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Generating System Respnse t Disturbances Fllwing Cntingency Events: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Quality f Electricity Generated and Cntinuus Uninterrupted Operatin: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Partial Lad Rejectin: Incrprate the prvisins f NER clause S with suitable amendments fr the NT. 15

16 NTC Clause Descriptin f prpsed amendment Prtectin f Generating Units frm Pwer System Disturbances: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Prtectin Systems that Impact n Pwer System Security: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Prtectin t Trip Plant fr Unstable Operatin: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Frequency Cntrl: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Impact n Netwrk Capability: Incrprate the prvisins f NER clause S with suitable amendments fr the NT Vltage and Reactive Pwer Cntrl: Incrprate the prvisins frm NTC clauses & with suitable amendments Active Pwer Cntrl: Incrprate the prvisins f NER clause S with suitable amendments fr the NT (new) (new) (new) Inertia and fast cntingency FCAS: New clause requiring new generatr users t prvide a minimum level f inertia r cntingency FCAS r a cmbinatin f bth. System Strength: New clause t incrprate the prvisins f NER clause 5.3.4B with suitable amendments fr the NT. Mnitring and Cntrl Requirements: Place marker nly Remte Mnitring: Incrprate the prvisins frm NTC clauses & with suitable amendments Cmmunicatins Equipment: Incrprate the prvisins frm NTC clause with suitable amendments Pwer Statin Auxiliary Supplies: Incrprate the prvisins f NER clause S5.2.7 with suitable amendments fr the NT Fault Current: Incrprate the prvisins f NER clause S5.2.8 with suitable amendments fr the NT. 4 POWER SYSTEM OPERATIONAL SUPPORT: Change in title frm Pwer System Security t remve clash with this title in the SCTC 4.1 Intrductin: Delete clause Purpse and applicatin f clause 4: Delete clause. 4.2 Pwer system security principles: Delete clause Pwer system perating state: Delete clause Technical envelpe: Delete clause General principles fr maintaining pwer system security: Delete clause. 4.3 Pwer system security bligatins and respnsibilities: Rewrk fr reduced cntent Time fr undertaking actin: Delete clause adequately cvered in SCTC Netwrk Operatr: Retain paragraphs (a) t (d). Mdify paragraphs (f) & (g). 16

17 NTC Clause Descriptin f prpsed amendment Pwer System Cntrller: Delete clause adequately cvered in SCTC Netwrk Users: Delete paragraph (a), retain paragraphs (b) & (c) in NTC. 4.4 Pwer system frequency cntrl: Rewrk fr reduced cntent Pwer system frequency cntrl respnsibilities: Delete clause adequately cvered in SCTC Operatinal frequency cntrl requirements: Delete clause adequately cvered in SCTC. 4.5 Cntrl f netwrk vltages: Rewrk fr reduced cntent Netwrk vltage cntrl: new paragraph (e) added t ensure that the limits in paragraph (c) are recrded in the SSG Reactive pwer reserve requirements: Delete clause adequately cvered in SCTC & SSG. 4.6 Pwer system perating prcedures: Place marker nly Netwrk peratins: Delete paragraph (a). Retain paragraphs (b) & (c) in NTC Switching f reactive pwer facilities: Delete paragraph (a). Retain paragraph (b) in NTC with suitable editrial amendments Generatin limits: Retain in NTC. 4.7 Pwer system security peratins: Delete clause adequately cvered in SCTC Users advice: Delete clause adequately cvered in SCTC Prtectin r cntrl system abnrmality: Delete clause. Transfer prvisin t new SCTC clause Pwer System Cntrller advice n pwer system emergency cnditins: Delete clause. Transfer paragraph (a) t new SCTC paragraph 7.5(b) with suitable mdificatins. Transfer paragraph (b) t System Cntrl Incident Reprting Guideline Managing a pwer system cntingency event: Delete clause adequately cvered in SCTC Managing electricity supply shrtfall events: Delete paragraphs (a)(1), (a)(2) & (c). Retain paragraphs (a)(3) and (b) with suitable mdificatins t fcus n un-licenced Users Directins by the Pwer System Cntrller affecting pwer system security: Retain paragraphs (a) & (b) with suitable mdificatins t fcus n un-licenced Users Discnnectin f Generatin Units and/r assciated lads: Delete paragraph (a). Retain paragraph (b) in NTC with suitable editrial amendments Emergency black start-up facilities: Retain prvisin n NTC Black system prcedures: Delete clause adequately cvered in SCTC Black system start-up: Delete paragraphs (a), (c), (d) & (e). Retain paragraph (b) in NTC Review f perating incidents: Delete clause adequately cvered in SCTC. 4.8 Pwer system security supprt: Rewrk fr reduced cntent. 17

18 NTC Clause Descriptin f prpsed amendment Remte cntrl and mnitring devices: Retain prvisin n NTC Operatinal cntrl and indicatin cmmunicatin facilities: Retain prvisin n NTC Pwer system vice/data peratinal cmmunicatin facilities: Delete clause adequately cvered in SCTC Recrds f pwer system peratinal cmmunicatin: Delete clause adequately cvered in SCTC Agent cmmunicatins: Retain prvisin in NTC with suitable mdificatins t give the primary rle t the Netwrk Operatr. 4.9 Nmenclature standards: Replace prvisin with a single paragraph t crssreference SCTC. Transfer all paragraphs t the SCTC clause Cmmitment f Generatin Units: Delete clause. Prvisin n lnger relevant t the SCTC r the NTC De-cmmitment, r utput reductin, by Users requiring standby pwer: Delete clause. SCTC suitably mdified t accmmdate this prvisin. 10 METERING REQUIREMENTS: nte placed n tile t advise that this Sectin wuld be superseded by Chapter 7A f the NT NER Infrmatin t be prvided by Users with Generatrs: Transferred t clause (b) & (c) Frequency stability criteria: Added RCF (rate f change f frequency) reginal bjectives. Clauses (b) replaced and (c) new. 18

19 Appendix D System Cntrl Technical Cde changes Impacts n System Participants & Netwrk Users Except fr a cuple f instances, there is n verall additinal impact n System Participants frm the changes t the SCTC that have been made t accmmdate the revisin f the NTC. One instance applies t a new clause Prtectin and Cntrl System Abnrmality. Anther instance applies t clause 6.14 Plant Numbering, Nmenclature and Drawings. The impact fr bth f these instances is briefly explained in the dedicated paragraph Three NTC induced changes f interest. A few changes have been made t the SCTC t accmmdate and clarify requirements f the NTC that are impsed n Netwrk Users when transferred t the SCTC. Whilst there are n verall impacts n these parties, their rles need t be mre clearly prescribed. This explanatin is prvided in the dedicated paragraph Netwrk User (and the synnymus term User). A cuple f changes impact n System Participants that are nt directly assciated with the NTC revisin. One instance applies t the Glssary term semi-scheduled generating unit. This impact is explained separately in its dedicated paragraph belw. Anther instance applies t a new Glssary term perfrmance issue utage. This impact is explained separately in its dedicated paragraph belw. Als, sme changes have been made t imprve the reading f a clause, tidy-up definitins r crrect a typ. These changes are briefly mentined in the dedicated paragraph nn-material changes. Netwrk User (and the synnymus term Users) It is nted that clause 38(2) f the Electricity Refrm Act prvides the System Cntrller with a pwer t direct an electricity entity (knwn as a System Participant in the SCTC). That pwer wuld extend t thse Netwrk Users wh cincidently were licenced (that is, generatrs and the netwrk peratr) these parties wuld have a direct relatinship with the System Cntrller under the electricity entity definitin. Hwever, the pwer t direct wuld nt extend t Netwrk Users wh were un-licenced (that is, mst custmers). Fr these Netwrk Users, the System Cntrller wuld nt have a direct relatinship with an un-licenced Netwrk User. Sme ther entity wuld need t be the interface between the System Cntrller and the un-licenced Netwrk User. The definitin and surce f the terms used in the abve paragraph are prvided fr the purpse f clarity as fllws: Electricity entity (Act): means a persn licensed under Part 3 [f the Act] t carry n peratins in the electricity supply industry and includes (where the cntext requires) a persn wh has been licensed t carry n peratins in the electricity supply industry under that Part whse licence has been suspended r cancelled r has expired. The peratins in the electricity supply industry fr which a licence is required are: generatin f electricity; wning r perating an electricity netwrk; selling electricity; 19

20 system cntrl ver a pwer system; r ther peratins fr which a licence is required by the Regulatins. Netwrk User (Act): means a persn wh has been granted access t the electricity netwrk by the netwrk prvider in rder t transprt electrical energy t r frm a particular pint. User (NTC): A persn, whether a lad User r a Generatr User, wh has been granted access t the electricity netwrk by the Netwrk Operatr in rder t transprt electrical energy t r frm a particular pint. System Participant (SCTC): A persn r bdy, licensed by the Utilities Cmmissin, wh inputs, transprts, cntrls, perates r takes electricity frm any part f a pwer system. Custmer (Act): means a persn wh receives, r wants t receive, a supply f electricity fr final cnsumptin and includes: (a) (b) (c) the ccupier fr the time being f a place t which electricity is supplied; where the cntext requires a persn seeking an electricity supply; and a persn f a class declared by the Regulatins t be custmers. Custmer (SCTC): A persn wh purchases electricity supplied thrugh a netwrk. Frm these definitins the fllwing bservatins can be made: An electricity entity is represented in the SCTC as a System Participant. A System Participant is a licenced entity. An entity wh generates electricity is bth a System Participant and a Netwrk User. An entity wh sells electricity is a System Participant and culd be a Netwrk User. The term User is synnymus with the term Netwrk User. An entity r persn wh has been granted access t the electricity netwrk fr the purpse f transprting electricity int the netwrk is a licenced entity. An entity r persn wh has been granted access t the electricity netwrk fr the purpse f transprting electricity ut f the netwrk fr the purpse f retailing is a licenced entity, and fr the purpse f cnsuming is nt a licenced entity that is, it is an un-licenced entity. A custmer is an un-licenced entity. The abve bservatins are summarised as: A Netwrk User cnsists f licenced entities and un-licenced entities. A licenced Netwrk User is identical t a System Participant. An un-licenced Netwrk User is identical t a custmer. The impact n the SCTC (frm the abve explanatin) ccurs because the NTC is cnstructed arund the term User (which is synnymus with Netwrk User ) and the SCTC is cnstructed arund the term System Participant. This means that transferring an NTC prvisin int the SCTC has t take int accunt the fact that the System Cntrller s pwers can t be applied t an un-licenced Netwrk User in the same way as they can be applied t a licenced Netwrk User. Rather, fr an un-licenced Netwrk User t have a wrking relatinship with the System Cntrller, a System Participant has t act as intermediary. The slutin arising frm a clser study f the NTC is t have the Netwrk Operatr, wh is a System Participant, take n the rle f intermediary between the System Cntrller and the un-licenced Netwrk User. In this way, the System Cntrller can direct the Netwrk Operatr t engage with the un-licenced 20

21 Netwrk User in a way that facilitates an effective relatinship between the tw entities. This will allw the System Cntrller t have a wrking relatinship with the un-licenced Netwrk User and cnsequently fulfil its respnsibilities in regard t pwer system security. This rle fr the Netwrk Operatr is clarified in the amendments t clause Respnsibilities f the Netwrk Operatr, and in clause 3.3.1(s) Respnsibilities f the Pwer System Cntrller. The changes t these clauses in the SCTC d nt change the verall impact n the Netwrk Operatr and the un-licenced Netwrk Users because these requirements are currently prescribed in the NTC. It is nted that the right f the Netwrk Operatr t facilitate an effective relatinship between the System Cntrller and un-licenced Netwrk Users must be stated in the NTC. The access agreement between thse parties becmes the mechanism t frmalise that relatinship it must cntain the necessary cnsent frm bth parties t perfrm their required rles. Hence, the NTC must retain sufficient prvisins ging frward t specify adequate cntent that must be included in access agreements between these parties. Three NTC induced changes f interest Three ther NTC induced changes f interest ccur in SCTC clauses and The clause change is t include generatin capability frecasts in additin t prductin frecasts, and t clarify the type f infrmatin t be prvided t the Pwer System Cntrller. The change is t adpt the perating prtcl as the mechanism fr recrding planned actins in the event f prtectin r cntrl system abnrmalities. This represents a tidy-up f NTC clause int the SCTC when taken in cnjunctin with clause (f). The 6.14 change is a verbatim relcatin f the prvisins f NTC clause 4.9 int the SCTC, with a tidy-up f the Glssary definitin f nmenclature standards. The verall impact n System Participants and Netwrk Users hasn t changed as a result f these changes. Semi-scheduled generating units This term has been remved frm the SCTC because its classificatin is nt supprted in the NT. The System Cntrller requires all generating units at r abve a certain utput capability t be classified as a scheduled generating units. This is because all generating units that cntribute t the dispatch stack fr the Darwin-Katherine pwer system (merit rder fr Alice Springs and Tennant Creek pwer systems) must prvide daily (r mre frequent fr sme technlgies) prductin frecasts t the System Cntrller and cntribute t the cntrl f frequency and vltage. The Pwer System Cntrller will nt undertake daily plant prductin frecasting. The changes appear in Sectin 3 f the SCTC. The detailed clauses are prvided Table 1. Plant utages due t perfrmance issues An amendment has been made t SCTC t: (a) (b) intrduce a new utage classificatin t deal with perfrmance issues; and prescribe that either the System Participant r the System Cntrller have a rle in identifying utage types and infrming the ther party f that bservatin. These amendments have been intrduced t restrict a generating unit wh is nt able t perfrm in accrdance with the parameters in the NTC r STC at a particular instance in time, t be left ut f the scheduling prcess, r if in service, t be taken ut f service until the perfrmance issue is fixed. The definitin f utage has been mdified, and a new term perfrmance issue utage has been added. The term perfrmance issue utages has been defined as Pwer System Cntrller r System Participant required utages t address perfrmance issues such as frecasting errrs, insufficient ancillary service cntributins, auxiliary equipment perfrmance, and any ther perfrmance issues that might impact n the secure peratin f the pwer system. 21

22 Nn-material impacts Nn-material changes (detailed belw) have n impact n System Participants and Netwrk Users. Prpsed Cde Amendments It is prpsed that the SCTC be amended in the manner marked up in the attached marked-up versin 6, as summarised in the fllwing way. A list clauses affected are listed in Table 2: Amendments t SCTC. Netwrk Operatr Clause Respnsibility f the Netwrk Operatr has been amended t mre clearly state the relatinship between the System Cntrller, the Netwrk Operatr and thse Netwrk Users wh are nt licenced. It is prpsed t clearly state that the Netwrk Operatr has a rle, similar t an intermediary, in facilitating a wrking relatinship between the System Cntrller and an un-licenced Netwrk User. A further nte f clarificatin has been added t clause 3.3.1(s) Respnsibility f the Pwer System Cntrller t crss-reference clause and minimise any dubt n hw the Pwer System Cntrller and un-licenced Netwrk Users interact. Lad frecasts Clause System Participants / Custmers frecasts has been amended t clarify the types f frecast infrmatin t be prvided, and t include frecasts f capability in additin t frecasts f prductin. This amendment has been made in a general manner t accmmdate intermittent generatin technlgies. The timing f thse frecasts will be included in the Pwer System Cntrller s perating prtcls, rather than being prescribed in the SCTC. Plant utages and frced utages Clause Types f utages has been amended, firstly t minimise any dubt that the need fr a plant utage can be identified by either the System Participant r the Pwer System Cntrller. In additin, a new type f utage, the perfrmance issue utage has been added t cater fr matters that may impse a limitatin n managing pwer system security. A new Glssary term perfrmance issue utages has been added, and the definitin f utage has been amended t refer t perfrmance issue utages. This amendment has flwed int clause 6.6 Frced Outages, with a change in the title and in the pening paragraph. Prtectin and cntrl system abnrmalities A new clause has been added t pick up when these abnrmalities ccur n Netwrk User prtectin r cntrl system equipment. The prvisin is a relcatin f NTC clause f the same title, with suitable editrial changes t reflect the cntext and rely n the perating prtcl mechanism in cnjunctin with the Netwrk Operatr clause 3.3.3(f). Nmenclature Clause 6.14 Plant Numbering, nmenclature and Drawings has been amended t adpt the principles specified in the NTC clause 4.9. This is because nmenclature standards are a crucial cntributin t pwer system peratins and security and must be endrsed by the System Cntrller. Hence3, versight f these standards are better lcated in the SCTC. In making this change, the Glssary definitin f nmenclature has been streamlined t better interact with clause N change f intent has been intrduced in the relcatin. Clause 4.9 f the NTC has been suitably adjusted t refer t the SCTC fr the nmenclature principles. N change t the respnsibility f the Netwrk Operatr has been made when cmpared t the NTC. Semi-scheduled generating units This change reflects a change t the Generatr Perfrmance Standards f the NTC, where this term has been remved. This is because the default psitin is that all generatrs must prvide sufficient cmmitment 22