Transend - Appendix 5 Renewal capital expenditure - Australian ...

Table 2 – Summary of Transend’s cost estimates for various components of option 1
Component of estimate
0BInvestment Evaluation Summary
TNM-GS-809-0720
Estimated capital cost
($2007 million)
Tungatinah 110 kV switchyard redevelopment – AIS $12.46
Tarraleah–Tungatinah Nos. 1 and No. 2 110 kV T/L substandard clearances $0.56
Boyer Tee Structure over-pass $0.82
Tarraleah 110 kV switchyard redevelopment – AIS $6.92
Easement and land costs $0.57
9 PREFERRED OPTION
TOTAL $21.33
Options 1, 3b and 3c are acceptable options.
The drawbacks with options 2a and 2b (consolidated AIS options at Tungatinah Substation) include:
� the double-bus bar option would be difficult to achieve given the site constraints and outage management issues;
� significant reconfiguration of transmission line circuits is required; and
� both options present increased risks during implementation working within a constrained, energised site.
Option 3c (remote site using hybrid switchgear) is technically feasible, however it may present a technology risk as
Transend has not previously utilised hybrid switchgear in its transmission network.
Given the constraints and numerous construction methodologies that may be implemented, Transend intends to issue this
project as a design and construct package to achieve the best economic outcome. The project documentation will leave it
open to tenderers to submit arrangements that may include AIS, GIS or hybrid switchgear solutions.
© Transend Networks Pty Ltd 15 of 15