Page 1805 - Week 06 - Thursday, 30 July 2020
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(4) See answer above.
(5) The planting was required as part of the approval process and will need to be undertaken before the completion of the development.
(6) Transgrid will be responsible for the ongoing maintenance of the planting. Condition D2 of the notice of decision for DA201732500 (Attachment B) requires an Operating Phase Environment and Sustainability Plan (OPESP) to be prepared by the proponent prior to operation. The OPESP must include adequate procedures to maintain/replace planting, intended for visual mitigation, through the life of the project.
(7) Several options were considered with regard to 330kV supply into the new substation from the National Grid. The lowest impact option to the proposed residential developments and the environment was to utilise a portion of the existing Holt to Williamsdale 330kV transmission line. The Holt to Williamsdale 330kV line is being diverted through the new substation. The location of the substation also required options to be considered to configure the transmission lines to meet the Electricity Transmission Supply Code – July 2016. These requirements consisted of:
1. A new 330kV transmission line connecting the new substation to the existing Holt substation; and
2. A new 132kV transmission line connecting the new substation to the existing Holt to Woden 132kV line.
Determining the transmission line routes from the new substation
It was considered logical to run the two new transmission lines from the new substation within a shared easement. The existing Holt to Woden 132kV line (owned and operated by Evoenergy) was already within a 92m easement through the Belconnen golf course. The Holt to Woden 132kV line was commissioned in 1967 and the 92m easement was in place in 1972 (See footnote 1).
The closest route to connect a new 132kV transmission line from the new substation to the existing 132kV transmission line was on the southern side of and along Stockdill drive. This route also did not impact any proposed development. Given that the new 132kV transmission line route was both logical and relatively low impact, the decision to route the new 330kV transmission within a new shared easement with the new 132kV transmission line was considered the best option. This new easement containing the 330kV and the 132kV transmission lines joined the existing 92m easement that contained the Holt to Woden 132kV line. From the south side of Stockdill Drive, the use of the existing 92m shared easement through the golf course to route the new 330kV transmission line to the Holt substation was considered the lowest impact to future residential developments and the environment.
Essentially the connection of the new 132kV transmission line from the new Stockdill substation to the existing Holt to Woden 132kV transmission line determined the new 330kV transmission line route from the new substation to the Holt substation through the existing golf course easement.
(a) As stated above, several routes were considered for transmission lines into the new substation. However, due to the requirement to connect a new 132kV transmission
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