Rule Change: Open

Overview

On 27 April 2020, TransGrid submitted a rule change request to amend the National Electricity Rules regarding the provision of system strength in the national electricity market (NEM).
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On 27 April 2020, TransGrid submitted a rule change request to amend the National Electricity Rules regarding the provision of system strength in the national electricity market (NEM). 

The request proposes to abolish the “do no harm” obligation and amend the minimum system strength requirements. This is intended to provide system strength in the NEM in a more proactive manner, to maintain a secure power system, and to provide additional levels of system strength to streamline the connection of new non-synchronous generators. 

The rule change proposal includes:

  • The Australian Energy Market Operator (AEMO) determining fault level nodes and minimum fault levels, accounting for the potential future generation forecast in the Integrated System Plan (ISP).
  • The creation of a system strength standard by an independent body that must be met by the transmission network service provider (TNSP).
  • That the current minimum system strength framework is integrated into TNSPs’ ordinary planning and regulatory frameworks.

TransGrid also proposes that any changes to the system strength framework are considered and reflected in the minimum system strength framework, such that the two frameworks are aligned. 

TransGrid’s rule change is one of seven rule change requests the AEMC is currently consulting on through the System services consultation paper. It is also being progressed alongside the AEMC’s Investigation into system strength frameworks in the NEM. See below for more details.

Submissions to the consultation paper are due on 13 August 2020.

Other relevant system services rule change processes underway

The AEMC has received seven rule change requests relating to the provision of system services. 

Collectively, the AEMC refer to these rule requests as the “system services” rule change requests and has published a single consultation paper seeking stakeholder feedback on the issues raised and the solutions proposed in each one. 

These system services rule change requests complement and are interdependent with the work of the Energy Security Board (ESB) to develop advice on a long-term, fit-for-purpose market framework to support reliability that could apply from the mid-2020's. The AEMC is working closely with the ESB and the other market bodies as it progresses these rule change requests. 

The AEMC has used the solutions proposed by each proponent to group the rule change requests into three timeframe-based "work streams" as a useful starting point for consultation. This will allow common issues to be considered more easily. These workstreams are:

Dispatch work stream which will consider the rule change requests where the solution proposed involves co-optimising services as part of the dispatch process with participants making short-term inter-temporal decisions between dispatch intervals to meet system needs, including:

Commitment work stream which will consider the rule change requests where the solution proposed involves committing or procuring the service ahead of the period for which there is a forecast need for the service, including: 

Investment work stream which will consider the rule change requests where the solution proposed involves services that would be procured more than a few months ahead of the period it is needed, including: 

The AEMC's Investigation into system strength frameworks in the NEM (System strength investigation) will also be progressed alongside these system service rule change requests.  

While the rule change requests are grouped this way for initial consideration, any new frameworks developed in response to the rule change requests will be focused on delivering the most efficient outcomes for consumers, having regard to outcomes across all time frames.
 

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