Australia’s energy market rulemaker has confirmed it will scrutinize how data centers and other large electricity users pay for the network capacity they consume. The Australian Energy Market Commission has received two rule change requests examining how data centers and other large electricity users contribute to network costs, and both requests currently sit pending before the Commission. Federal Climate Change and Energy Minister Chris Bowen submitted both requests in July, positioning them as a direct response to the sheer pace of large-load growth across the grid. AEMO’s latest forecasts project data center electricity consumption rising from roughly 5 TWh in 2025-26 to 34 TWh by 2035-36, increasing its share of electricity supplied through the grid from around 3 percent to approximately 13 percent. That trajectory would push data centers to around 8 percent of total National Electricity Market operational consumption within just four years.
Why the Current Framework Is Under the Microscope
The rule change requests frame the issue around whether existing arrangements adequately address the costs and risks associated with increasingly large electricity connections. Connecting parties already pay for the infrastructure required to facilitate their own connections, and they also pay ongoing charges for their use of the shared network. The rule change requests examine whether existing arrangements properly capture the costs and risks tied to today’s scale of large-load connections.
Data centers, in particular, can have connection capacities, electricity-use profiles and demand ramp-up timelines that require network planners to distinguish between the capacity requested and the electricity ultimately consumed. The rule change requests therefore examine whether the current cost-recovery model remains appropriate as increasingly large connections place new demands on network planning and investment. This is not a minor technical tweak; it touches the fundamental question of who pays when the grid must grow to serve a handful of very large customers.
Seven Potential Gaps on the Table
Bowen’s requests identify seven potential gaps in the existing framework, which the proposed rule changes seek to address through changes to network cost recovery, connection arrangements and large-load information. One concern is that a large load connecting to a distribution network could trigger upstream transmission augmentation costs that end up partly recovered from other, unrelated customers. Another concerns the risk that network businesses build assets for a project that never proceeds, or that ultimately uses far less capacity than originally forecast, leaving the cost burden stranded.
A third gap concerns clustered large loads, where several sizeable connections in one area can require major shared network investment and raise questions about how the resulting costs should be allocated. Another proposed reform would improve the information available on existing and prospective large loads to support forecasting and network planning. Rounding out the list are questions over whether transmission-connected large loads should contribute to jurisdictional scheme costs, and whether the rules give network businesses enough guidance on pricing transmission connection services.
The Jurisdictional Scheme Blind Spot
One gap deserves particular attention because it exposes a structural asymmetry in the current rules. The National Electricity Rules already provide a mechanism for recovering jurisdictional scheme costs from distribution-connected customers, spreading that burden across a broad customer base. No equivalent framework currently exists for transmission-connected customers, meaning large loads that connect directly to transmission infrastructure can sit outside that cost-sharing mechanism entirely. As large electricity users seek connections at different levels of the network, the proposed treatment of jurisdictional scheme costs becomes a relevant issue in determining how those costs get allocated. Bowen’s rule change requests identify this asymmetry as an issue for potential reform, while the AEMC has not yet initiated either request. The AEMC has not yet opened formal consultation on either request; the Commission says it will publish a consultation paper if it initiates the rule-change processes.
Prudential Requirements and a Public Large-Load Register
Among the specific changes Bowen has proposed is a requirement for network service providers to apply prudential requirements to large connections, a mechanism designed to give network businesses financial protection against projects that fail to proceed as planned. Bowen’s proposal would also limit the ability of network businesses to recover the cost of stranded, customer-specific assets from the broader consumer base, shifting more of that risk toward the connecting party.
The proposals would also require network service providers to supply information on existing and prospective large loads to AEMO, feeding into a proposed public large-load register. That register would give planners and other market participants better visibility over where major new demand could emerge. Other measures in the package would make it easier for connection applicants to voluntarily fund, or bring forward, major network augmentations they need. The package also proposes greater consistency in transmission connection pricing, while the AER’s existing Connection Charge Guidelines currently apply to distribution network service providers.
Part of a Much Larger Data Center Reform Program
These cost-recovery rule change requests form one strand of a considerably broader AEMC data center reform program that has been building for some time. The Commission’s earlier advice to Energy Ministers already recommended measures spanning clean energy procurement, firming capacity, market registration, and demand flexibility for large loads. AEMO has separately proposed its own reforms aimed at improving the operational visibility of large inverter-based loads such as data centers. Regulators are also considering further reforms around data center contracting obligations, market registration, demand flexibility, operational visibility and connection arrangements. The AEMC’s data center advice identifies these measures as a package of reforms covering clean energy procurement, firming capacity, market registration and demand flexibility, alongside related rule change processes. The proposed cost-recovery reforms sit alongside separate AEMC work on market registration and the operational visibility of large inverter-based loads, creating potential interactions between the different workstreams.
Coordinating Across a Crowded Regulatory Landscape
Beyond its own reform agenda, the AEMC’s data center work sits alongside several other regulatory processes now in motion. These include the Australian Energy Regulator’s existing Connection Charge Guidelines for electricity customers, which apply to distribution network service providers and form part of the broader connection-cost framework. They also include separate work on network cost allocation in New South Wales, adding another layer to the broader discussion around how large-load network costs should get allocated.
Meanwhile, the Federal government is developing emerging national standards for new data centers, adding yet another layer that this cost-recovery work will need to complement rather than contradict. The overlapping nature of these processes reflects just how central data center growth has become to energy policy debates across every level of government. For network businesses, developers, and large energy users alike, tracking these parallel tracks will be essential to understanding where the rules ultimately land.
Timeline: What Happens Next
The AEMC has not yet set out a formal consultation timetable for either cost-recovery rule change, and both requests currently sit pending. The AEMC has not yet opened formal consultation on the two rule change requests, so its current project pages do not publish an official submission deadline. The Commission has not yet published a draft determination date for either request, and both projects remain pending. The Commission has not published an extended timetable or attributed its timing to the complexity of the proposals or their interaction with the wider data center reform program. The proposals cover several interconnected areas, including prudential requirements, large-load information and network connection-cost arrangements. For an industry planning increasingly large electricity connections, the eventual outcome of these rule changes could become relevant to network investment and connection decisions as the AEMC progresses the proposals.
