(22 November – I’ve been through and finalised the split and merged SA1s to produce my final version of the margins. They have been incorporated into the table inside the post.)
(UPDATE – the final boundaries have been released confirming the abolition of North Sydney. There are some very minor changes of at most 0.1% and these have been updated in the table.)
(UPDATE – Friday 13 September – a discrepancy where the new electorate file coded Mcmahon rather than McMahon caused an error in my calculations. The significant changes are that Blaxland drops back from 13.9% to 13.1% while the new margin for McMahon is now 10.5% as opposed to the original estimate of 13.1%. There is also a minor adjustment for Fowler.
On Thursday 12 September, the Redistribution Committee for New South Wales released the final version of the state’s new Federal electoral boundaries. Draft boundaries were released in June and opened for public comment. This final version will be formally gazetted later this month and used for the first time at next year’s Federal election.
The redistribution has taken place to decrease the number of NSW federal divisions from 47 to 46. The final boundaries have confirmed the abolition of the Independent held seat of North Sydney.
The draft boundaries were released when I was overseas so this post is my first analysis of the draft boundaries. Today’s release includes a string small number of minor adjustments to the draft boundaries, none of which alter the analysis in this post. I will make minor adjustments to this post once the AEC publishes the datafiles required for calculations, sometime next month.
Re-calculating margins is a complex task of processing AEC polling place data files on where people voted in 2022 and comparing them with Bureau of Statistics files listing the low level SA1 (Statistical Area 1) composition of new electorates. Complicating the process is a re-numbering of many SA1s between the 2016 and 2021 Censuses. The 2022 AEC files used the old SA1 identifiers and the new electorate files use the new SA1 identifier. This has required a lot of fiddling with data to resolve inconsistencies between SA1 identifiers. Not all of the SA1 inconsistencies could be resolved but I do not believe they significantly affect any calculations.
The AEC will release its own versions of new margins next year as the election approaches. The AEC has many more resources to resolve SA1 inconsistencies and splits than are available to me.
Change in Seat Numbers
Change in Seats Held by Party
|
ALP |
LIB |
NAT |
GRN |
IND |
Total |
| Old boundaries
|
26 |
9 |
7 |
.. |
5 |
47 |
| New boundaries
|
25 |
10 |
7 |
.. |
4 |
46 |
Based on traditional two-party preferred results, including for the underlying Labor-Coalition nature of Independent held seats, the changes in two-party preferred holdings are –
- Old Boundaries 2PP: Labor 27, Coalition 20 (Liberal 13, National 7)
- New Boundaries 2PP: Labor 26, Coalition 20 (Liberal 13, National 7)
The changes are brought about by the abolition of Independent-held North Sydney, a flow on impact of which is to flip neighbouring Bennelong from being a marginal Labor seat to as very marginal Liberal seat.
The three-way carve up of North Sydney along council boundaries is shown in the map below.
The main political implications of the changes are –
- A relative decline in enrolment on Sydney’s lower north shore and northern beaches suburbs required a seat to be abolished north of the harbour, and as predicted before the process began, North Sydney has been abolished and divided between the re-drawn seats of Bennelong, Bradfield and Warringah.
- There was also a shortfall south of the harbour but this has been fixed by a shift west and south-west of all boundaries to absorb a significant surplus of enrolments in south-west Sydney.
- The Liberal electorate of Hume has also become an urban seat, shedding almost of all of its rural areas along the Hume Highway north of the ACT. It is now based on Camden in Sydney’s outer south-west fringe, along with western Parts of Liverpool Council and semi-rural Wollondilly Shire to the south. Geographically the changes are massive but the Liberal margin declines only slightly, from 7.7% to 6.9%.
- The abolition of North Sydney is bad new for Independent Kylea Tink, but neighbouring Independents Sophie Scamps in Mackellar and Zali Staggall in Warringah retain their margins. There are few changes to the boundaries the western Sydney seat of Fowler won by Independent Dai Le in 2022.
- In Wentworth, Independent Allegra Spender is significantly strengthened. Wentworth is a traditional Liberal seat but surrounding by Labor voting territory. By expanding into neighbouring Sydney and Kingsford Smith, Wentworth’s underlying Liberal 2-party preferred margin declines from 5.9% to 1.2%. Estimating a new Independent margin for the areas added to the seat is difficult, but a best estimate is that the addition of areas with weaker Liberal support boosts the Independent margin from 4.2% to 6.6%.
- In Bradfield, Liberal MP Paul Fletcher faced a significant Independent challenge in 2022 that reduced his margin to just 4.2% versus an Independent. By shifting south and picking up parts of North Sydney, his margin is reduced to 2.5%. His Independent challenger from 2022, Nicolette Boele, has already announced she will contest the next election. It is unclear whether Kylea Tink will also contest Bradfield if the final boundaries confirm the abolition of her seat.
- As already mentions, the abolition of North Sydney turns Bennelong from a marginal Labor seat to a very marginal Liberal sea.
- By losing its Labor-voting southern end and extending north of Windsor Road, Michelle Rowland’s Labor seat of Greenway has its margin cut from 11.5% to an estimated 8.1%. As has been shown in the past, if the Liberal Party can select a good candidate, Greenway is a more marginal seat than it often appears on paper.
- The Liberal margin for Hughes is cut from 7.0% to 3.6% as it loses Liberal voting areas near Sutherland and is pushed west beyond the Georges River to gain Labor voting territory from Weriwa and Macarthur.
(There may changes to the construction of Hughes in the final boundaries.) There were no changes with the final boundaries.
- In the Hunter valley, the transfer for Kurri Kurri strengthens Labor in Hunter but weakens its position in Paterson.
- The National margin in Riverina declines from 14.8% to a still safe 9.7% after picking up parts of Eden-Monaro and Hume.
The new margin estimates in this post have not taken into account the adjustments included in the final boundaries. However, the list of adjustments released seem unlikely to change the estimated margins below.
Seat tables can be found inside the post.Read More »2024 Federal Redistributions – Final Boundaries for NSW Released