Network Modifications

Modifying TransGrid Network Assets

Modifying our transmission network is a significant task that requires extensive planning, coordination, engineering and construction. 

Our Network Modification Process outlines the typical steps involved in project assessment and delivery. The process provides some flexibility to meet customer requirements for individual projects, where possible. 

Please note that the cost for activity beyond the initial enquiry stage is borne by the party requesting the change.

Key information about modification projects

Find out about your responsibilities, plus what you’ll need to prepare and plan for the project. This advice covers project approvals, easement acquisition, incentive scheme payments and contractual agreements. 
  • Modification Processes Agreement (MPA)

    A Modification Processes Agreement (MPA) sets out the scope of work, applicable charge rates, and the terms under which work will be completed by TransGrid when required (or requested by a customer).

    A separate or amended MPA is required for each stage of the process.

    Our standard MPA is available upon request.

  • Technical requirements

    Proposed modifications to TransGrid’s existing regulated electricity transmission network must not reduce its integrity, reliability or security. 

    The Line Modification team can the discuss design and arrangement of modifications to existing assets. Advice will vary depending on factors including:

    • Geographical location
    • Proximity of existing TransGrid transmission lines, switching stations or substations
    • Criticality to the transmission network of the transmission line/s that you are seeking to modify
    • Our required reliability standards (i.e. n, n-1 etc)
    • Geological nature of the site/s identified for construction of any required asset.

    TransGrid cannot accept modification works proposals from external providers concerning our regulated transmission network.

  • Easement and Property Issues

    Any network modification that requires changes to the existing freehold land or easements arrangements will require the same or greater property rights to be granted to TransGrid. 

    The obligation to acquire and transfer these new property rights rests with the party requesting the modification.

    The following is required for transmission line relocations:

    • Easements for TransGrid owned lines are to be negotiated and paid for by the customer. TransGrid may register the easements in TransGrid’s name once all necessary agreements are in place. Further detail can be found in our Easement Guide.
    • Suitable laydown and preconstruction areas for the transmission lines (when relevant).

    These requirements are indicative only and not intended to be exhaustive. Should your network modification involve switching stations, substations and/or communications network assets, there may be different property requirements. These will be discussed on a project specific basis. 

  • Environmental and Developmental Approvals

    TransGrid is unable to commence construction until: 

    • Approved environment and development documents are provided. 
    • Any land upon which TransGrid will construct assets (including but not limited to the new easement, access tracks, construction pads) is cleared of environmental constraints (vegetation, heritage items, demolition works etc.) and ready for construction to start.

    Standard conditions of approval and assessment do not always meet the TransGrid technical design standards or cover all land necessary to complete a project. 

    We recommend that you discuss the requirements with TransGrid prior to making your approval submissions to the relevant authorities. This can help you avoid possible significant time delays and costs.

    The development approvals required typically include, but are not limited to:

    • New transmission towers or poles and associated access rights
    • Modifications or restringing work for existing towers. This may include a need for provision of level, cleared areas to enable work to be carried out safely in the vicinity of the existing structures.

    The modification requestor is responsible for all environmental and development approvals. 

    It should be noted that TransGrid does not use its self-determining rights under the New South Wales Environmental Planning and Assessment Act 1979 for non-prescribed projects, such as modifications.

    The project schedule may need to be discussed if modifications are required to your submissions or existing approvals. Alternatively, there may be additional cost implications for design solutions that allow TransGrid to cater for existing approvals that do not meet our requirements.

  • TNSP Incentive Scheme Payments

    Modifications to TransGrid’s network often require a scheduled outage. In these circumstances, it is important to understand that the customer is responsible for reimbursing TransGrid for any loss of incentive payments from the Electricity Transmission Network Service Providers Service Target Performance Incentive Scheme. 

    The scheme incentivises TNSPs to minimise the impact of network outages on dispatch of electricity to the National Electricity Market.

    Details of the TNSP Incentive Scheme can be found on the AER website. 

    The current TNSP Incentive Scheme (Version 5) has been in effect since October 2015. 

Begin your modification enquiry
To enquire about modifications, complete the Modification Enquiry Checklist and email it to