Transmission Licence Compliance Review - ElectraNet Pty Ltd 28 September 2016 state-wide power system outage June 2017 Issued by the Essential Services Commission in June 2017 Enquiries concerning this report should be addressed to: Essential Services Commission GPO Box 2605 Adelaide SA 5001 Telephone: (08) 8463 4444 Freecall: 1800 633 592 (SA and mobiles only) E-mail: [email protected] Web: www.escosa.sa.gov.au TransmissionThe Essential Licence Services Compliance Commission Review is an -independent ElectraNet Ptystatutory Ltd authority with functions in a range of essential 2 services including water, sewerage, electricity, gas, rail and maritime services, and also has a general advisory function on economic matters. For more information, please visit www.escosa.sa.gov.au. Table of contents Glossary of terms ........................................................................................................................................................ iii 1 Executive summary..............................................................................................................................................1 1.1 Findings and recommendations .............................................................................................................1 1.2 Other reviews ...............................................................................................................................................3 2 Scope of the review ..............................................................................................................................................4 2.1 Licensing under the Electricity Act 1996 ...............................................................................................4 2.2 Summary of the event ...............................................................................................................................4 2.3 Significant event reporting........................................................................................................................5 2.4 Licence conditions under review .............................................................................................................6 2.5 Process and scope .....................................................................................................................................6 2.6 Other reviews ...............................................................................................................................................7 3 Electricity Transmission Code ...........................................................................................................................9 3.1 Overview of the Electricity Transmission Code ....................................................................................9 3.2 Reliability and equivalence terminology.............................................................................................. 10 3.2.1 N reliability ............................................................................................................................................ 11 3.2.2 N-1 reliability ........................................................................................................................................ 11 3.2.3 Equivalence .......................................................................................................................................... 11 4 Emergency provisions of the Code ................................................................................................................ 12 4.1 Obligation .................................................................................................................................................. 12 4.2 Was there an emergency? ..................................................................................................................... 12 4.2.1 Evidence ................................................................................................................................................ 12 4.2.2 Analysis and findings ......................................................................................................................... 13 4.3 Were the emergency provisions invoked? .......................................................................................... 14 4.3.1 Evidence ................................................................................................................................................ 15 4.3.2 Analysis and findings ......................................................................................................................... 15 4.4 Compliance with the requirements of clause 9.1.2(a) ..................................................................... 15 4.4.1 Evidence ................................................................................................................................................ 15 4.4.2 Analysis and findings ......................................................................................................................... 15 4.5 Compliance with clause 9.1.2(b) .......................................................................................................... 16 4.5.1 Evidence ................................................................................................................................................ 16 4.5.2 Analysis and findings ......................................................................................................................... 18 5 Restoration of transmission services in other parts of the state ............................................................ 19 5.1 Obligation .................................................................................................................................................. 19 5.1.1 Facts ...................................................................................................................................................... 19 5.2 Evidence .................................................................................................................................................... 21 5.3 Analysis and findings .............................................................................................................................. 25 Transmission Licence Compliance Review - ElectraNet Pty Ltd i 5.3.1 Clause 2.5 of the Code – Category 1 exit points .......................................................................... 25 5.3.2 Clause 2.6 of the Code – Category 2 exit points .......................................................................... 25 5.3.3 Clause 2.7 of the Code – Category 3 exit points .......................................................................... 25 5.3.4 Clause 2.8 of the Code – Category 4 exit points .......................................................................... 26 5.3.5 Clause 2.9 of the Code – Category 5 exit points .......................................................................... 26 6 Restoration of Port Lincoln .............................................................................................................................. 27 6.1 Obligation .................................................................................................................................................. 28 6.2 Facts .......................................................................................................................................................... 28 6.3 Evidence .................................................................................................................................................... 30 6.3.1 Historical performance at Port Lincoln........................................................................................... 30 6.3.2 Timeline of events ............................................................................................................................... 32 6.3.3 System restart ..................................................................................................................................... 34 6.3.1 Restoration of the Yadnarie to Port Lincoln transmission line .................................................. 35 6.3.2 Generator availability - 29 September 2016 to 8 October 2016 ................................................ 35 6.4 Analysis ..................................................................................................................................................... 36 6.4.1 Network support arrangement availability..................................................................................... 36 6.5 Findings and recommendations .......................................................................................................... 39 6.5.1 System restart ..................................................................................................................................... 39 6.5.1 Restoration of the Yadnarie to Port Lincoln transmission line .................................................. 40 6.5.2 Port Lincoln connection point reliability ......................................................................................... 40 7 ElectraNet’s risk management system ......................................................................................................... 43 7.1 Obligation .................................................................................................................................................