Sydney data centre connections will now require user-funded grid upgrades to accommodate growing power demand.

New large-scale data centre connections in Sydney will require proponents to fund additional transmission infrastructure. Network operator Transgrid announced on 26 August that the Sydney basin in New South Wales currently lacks sufficient transmission capacity to accommodate its 20 GW of enquiries for new large electrical loads. Approximately 1.5 GW of capacity has already been allocated through signed connection agreements in Western Sydney.

Technical analysis has identified a pathway to unlock up to 2 GW of additional transmission capacity through targeted investments. Key projects include a new South Creek 500/330 kV substation, along with further substation and transmission-line upgrades across Western Sydney.

Transgrid stated that additional data centre connections can only proceed once the required network upgrades are completed, with all associated costs borne by the proponents driving the increased electricity demand. This model is designed to shield existing electricity consumers from bearing the financial burden. Even after these upgrades, Transgrid anticipates that demand for available capacity will outstrip supply. Consequently, capacity will continue to be allocated on a first-come, first-served basis tied to when customers sign connection agreements and commit to funding the necessary transmission works. The operator is simultaneously collaborating with distribution networks, the Australian Energy Market Operator (AEMO), government bodies, and major customers to enhance forecasting and planning for future large electricity loads.

The announcement aligns with AEMO’s projections of substantial growth in data centre electricity consumption. According to its 2026 Electricity Statement of Opportunities, power consumption across the National Electricity Market is projected to surge from roughly 5 TWh in 2025–26 to approximately 34 TWh by 2035–36, representing about 13% of total operational electricity demand.

These developments illustrate how rapid data centre expansion is directly translating into significant investment requirements for electricity networks. In Sydney, the deployment of additional computing infrastructure will rely not only on individual grid connections but also on broader transmission upgrades needed to support emerging demand. By placing the responsibility for additional network costs squarely on the new large energy users generating that demand, this approach highlights how connection capacity, infrastructure investment, and cost allocation are becoming critical factors in Australia’s evolving cloud and artificial intelligence infrastructure landscape.