What does AEMO’s 2026 ISP say about data centres?

AEMO’s 2026 Integrated System Plan, released on 25 June 2026, forecasts that data centres reach almost 10% of the National Electricity Market’s underlying demand by 2050 under its central Step Change scenario, up from around 2% today and growing about 25% a year. The plan treats data centres as a distinct, separately modelled driver of national electricity demand for the first time, alongside electrification and population growth, and contributes about 34 TWh of the increase in business and industry grid demand to 2050.

How much electricity will Australian data centres use by 2050?

Under AEMO’s Step Change scenario, data centres reach almost 10% of the NEM’s underlying demand by 2050, contributing around 34 TWh of the forecast increase in business and industry grid consumption. Total NEM underlying consumption is forecast to nearly double from 205 TWh today to about 390 TWh in 2050. AEMO stresses the forecast is uncertain and brackets it across three scenarios plus a Higher Demand sensitivity that assumes about 39 TWh of additional load in 2050.

Can the grid handle faster data centre growth?

AEMO’s 2026 ISP concludes the optimal development path is robust to higher data centre demand. Its Higher Demand sensitivity, assuming about 39 TWh more electricity in 2050, found that additional load increases the need for generation and storage and raises the net market benefit of transmission from nearly A$30 billion to A$61 billion, without changing the ranking of candidate paths. The plan holds provided new generation and transmission are delivered close to schedule.

AEMO 2026 ISP finds the grid plan holds as data centres scale

Q: What new rules is AEMO introducing for large data centres?

AEMO is advancing two reforms. The Australian Energy Market Commission is considering a draft rule change, initiated by AEMO, for new technical standards for large data centres, and AEMO is preparing a separate rule change for operational integration and visibility of large inverter-based loads. AEMO has published interim guidelines for proponents. Both reforms aim to replace bespoke, case-by-case connection arrangements with consistent operational requirements and a more streamlined connection process.

At a glance

AEMO released the final 2026 Integrated System Plan (ISP) on 25 June 2026, the statutory roadmap for the National Electricity Market (NEM) through to 2050.
Under the central Step Change scenario, data centres reach almost 10% of the NEM’s underlying demand by 2050, up from around 2% today, growing about 25% a year.
AEMO tested a Higher Demand sensitivity assuming about 39 TWh more electricity in 2050 than Step Change, concentrated in South Australia, the Sydney-Newcastle-Wollongong corridor, Melbourne-Geelong and Gladstone.
Under that higher load, the net market benefit of the ISP’s transmission projects rises from nearly A$30 billion to A$61 billion, and the optimal development path remains within A$60 million of the least-cost candidate.
At the end of the March 2026 quarter, 11 large data centres representing more than 5 GW of maximum demand were working through transmission connection, with energisation taking about two years and full ramp-up running five to 10 years.
The ISP and AEMO’s Minimum System Load tender both point to flexible data centres helping absorb surplus daytime solar, turning new load into a balancing resource that lowers system costs.

Data centres grow into a major grid load by 2050

Data centres now appear in the opening lines of the ISP’s CEO preface, listed alongside electrification and population growth as the forces reshaping the grid. That placement is the signal. In the 2024 ISP, data centre load sat inside broader business demand. In the 2026 plan, AEMO treats it as a distinct, separately modelled driver of national electricity consumption.

The headline numbers set the scale. Total underlying consumption across the NEM is forecast to nearly double, from 205 TWh today to about 390 TWh in 2050. Within that, AEMO assumes under Step Change that data centres reach almost 10% of underlying demand by 2050, up from roughly 2% today. The business and industry segment alone is forecast to draw 280 TWh from the grid by 2050, double its current level, with data centres supporting AI and cloud services contributing about 34 TWh of the increase and hydrogen production a further 35 TWh.

AEMO is candid that the forecast carries wide uncertainty. It notes that data centre development is already exceeding what previous ISPs anticipated, and that connection rates and technical frameworks are still being revised. Rather than settle on a single number, the plan brackets the question across three core scenarios and a dedicated Higher Demand sensitivity. That structure is the more important story for operators and investors than any single point estimate.

Higher demand lifts transmission benefits to A$61 billion

The central question for anyone building or financing capacity is whether faster data centre growth breaks the grid plan. AEMO’s answer is no, and the supporting analysis is the consequential data centre content in the document.

AEMO ran a Higher Demand sensitivity assuming about 39 TWh more electricity would be needed in 2050 than under Step Change, driven by a sharper increase in demand from data centres and other large industrial loads. The additional load is concentrated in four regions.

Region	Additional load in 2050 (Higher Demand vs Step Change)
South Australia	+18 TWh
Sydney, Newcastle and Wollongong	+11 TWh
Melbourne and Geelong	+4 TWh
Gladstone	+3 TWh

Source: AEMO 2026 Integrated System Plan, Section 11.4, June 2026.

Under that higher load, the net market benefit of the ISP’s transmission projects rises from nearly A$30 billion in Step Change to A$61 billion. The optimal development path stayed within A$60 million of the least-cost candidate, which AEMO cites as confirmation that the plan is robust to demand it cannot yet pin down. The structural point is that additional data centre load increases the need for generation and storage and strengthens the value of transmission, without changing the relative ranking of the candidate paths AEMO compared.

For an Australian audience weighing the energy debate around data centres, this reframes the question. The ISP does not present new large loads as a threat to the build plan. It presents them as demand the least-cost path absorbs, and as a reason transmission pays for itself faster. That holds only if new supply keeps pace, which is the delivery challenge AEMO returns to throughout the plan.

Eleven projects and 5 GW sit in the connection queue

The forecast is anchored to load that is already in the queue. AEMO’s Quarterly Energy Dynamics report now tracks data centre connections across the NEM, and the ISP draws on that pipeline directly. We covered the underlying disclosure in our analysis of AEMO’s 5.4 GW data centre connection pipeline.

There are more than 160 operational data centres in Australia, with almost half in Sydney and most of the rest in Melbourne, Brisbane and Perth. At the end of the March 2026 quarter, 11 large data centres representing more than 5 GW of maximum demand were in the transmission connection pipeline. Connections have taken about two years from application to energisation, similar to battery projects, and ramp up to full demand over five to 10 years. That ramp profile matters for grid planning: a connection approved today lands its full load across the second half of the decade, which is precisely the window in which two-thirds of the remaining coal fleet could retire.

The neocloud and AI-factory buildout sits behind much of this load. As we set out in our neocloud market report, a new tier of GPU-first operators is signing multi-megawatt leases across Sydney, Melbourne and Perth, and the NVIDIA AI factory shift is raising the power density of each new deployment.

AEMO advances two rule changes for large loads

The ISP also documents the regulatory machinery AEMO is building around data centre load, and this is where the plan translates into concrete change for proponents.

AEMO has been working formally with the Energy and Climate Change Ministerial Council and other market bodies on the energy implications of data centres since March 2025. Two reforms are moving through the system. The Australian Energy Market Commission is considering feedback on a draft rule change, initiated by AEMO, for new technical standards for large data centres. AEMO is separately preparing a rule change for operational integration and visibility of large inverter-based loads, including data centres, and has published interim guidelines to support proponents in the meantime.

AEMO frames both reforms as a move away from bespoke, case-by-case connection arrangements, which it says limit efficient investment signals and complicate system operation. The proposed changes would introduce consistent operational requirements and streamline connections. AEMO also notes it works with system operators in the United States and Europe to understand large-load behaviour, a sign that Australian connection standards are being set with reference to how comparable grids are absorbing AI load.

Demand flexibility can turn data centre load into grid support

The ISP points to a role for large loads that is positive for the system. It finds that demand flexibility reduces the need for grid-scale investment, because load that can move to when energy is abundant lowers the amount of network, storage and generation the NEM has to build. The clearest near-term version of that is the surplus rooftop solar now flooding the grid in the middle of the day, which has pushed operational demand to record lows in South Australia and Victoria and at times forced AEMO to curtail solar to keep the system secure.

A data centre that can lift or shift load into those daytime hours helps absorb that surplus. AEMO has already moved to enlist exactly this kind of load. In its Minimum System Load tender, the operator named data centres, alongside electric vehicles and industrial loads, among the technologies it wants to create daytime demand and soak up excess solar across South Australia, Victoria, New South Wales and Queensland.

For operators, that changes the calculation. A data centre able to move load with system conditions can help balance the grid that serves it, and the ISP counts that flexibility among the levers that keep the whole transition at least cost.

What to watch

The ISP confirms the plan, and the focus now shifts to delivery against a pipeline that is already moving. Three items are worth holding in view.

First, the AEMC’s response to AEMO’s draft rule change on technical standards for large data centres, which will define the connection bar for new projects. Second, each Quarterly Energy Dynamics release, which is now the clearest public read on how fast the 5 GW pipeline is converting to energised load. Third, the supply side, because the ISP’s central finding that data centre growth is manageable rests on generation and transmission being delivered close to schedule. On AEMO’s own numbers, the existing pipeline of wind and solar would deliver only about three-quarters of the new capacity needed by 2030.

The energy case for data centres in Australia turns on a condition the ISP states plainly. New large loads strengthen the grid plan when they arrive alongside new supply and the transmission to move it. The 2026 ISP says the least-cost path can carry the load. Whether it does depends on build rates that AEMO, in the same document, flags as the binding constraint.