Draft grid rules target data centres' rising impact

The Australian Energy Market Commission has published draft changes to grid connection rules aimed at the growing impact of data centres and other large electricity users on the power system, particularly during disturbances.

The proposals focus on how major loads connect and how they behave when the grid experiences events such as faults or frequency deviations. Demand from data centres has risen in recent years, and regulators have flagged the need for clearer expectations for connection performance as more large, fast-growing loads seek access to the network.

SMA Australia, which supplies inverter and control technologies used in large-scale renewable energy and storage projects, backed the direction of the reforms. "SMA welcomes the proposed changes that strengthen how large electricity users connect to and interact with the grid," said John Alexander, Managing Director of Large-Scale Solutions at SMA.

The draft package comes as grid operators and planners manage the combined effects of rising electrification, expanding renewable generation, and large new sources of demand. Data centres stand out because they can add substantial load at a single connection point and scale quickly as operators expand compute capacity.

In Australia, new connections for large loads typically proceed through detailed technical studies and negotiated performance standards. The draft changes signal a shift towards rules that more directly address how these loads affect the system during abnormal conditions, not only their day-to-day consumption.

Alexander pointed to overseas experience as a warning for Australian system planning. "In the US, data centres have caused headaches for system operators. Advanced technology can reduce those impacts, and Australia's regulators continue to demonstrate leadership by getting ahead of the game."

US power markets have seen growing tension over where and how data centres connect, as utilities and grid operators weigh reliability, network congestion, and the cost of upgrades. The debate has included how quickly large new loads can be connected, how network investment is paid for, and what technical requirements should apply to improve performance during grid events.

Technology Options

Data centres often rely on uninterruptible power supplies and on-site backup generation, and many purchase renewable energy through power purchase agreements. A growing number are also assessing on-site options, including batteries and other distributed resources, alongside operational changes that can reduce exposure to network constraints or disturbances.

SMA describes inverter technology as a key component of large-scale renewable and storage plants. In these projects, inverters interface between generation or storage assets and the grid, while plant control systems co-ordinate how assets respond to grid conditions and dispatch requirements.

Grid support functions provided by inverters and control systems have become more prominent as synchronous generation retires and the generation mix changes. As the system relies more on power electronics and distributed resources, the behaviour of connected equipment during disturbances has come under increased scrutiny.

For data centres, the business requirement is consistent power quality and reliability. Operators also face rising energy costs and tighter expectations around emissions reporting and procurement. These drivers have pushed developers to explore configurations that combine on-site renewable generation with batteries, alongside power conversion equipment that can manage flows between assets and the grid.

The AEMC's focus on connection standards also reflects the changing profile of electricity demand. Historically, industrial loads such as mines, smelters, and manufacturing sites dominated large new connections. Data centres are now among the most visible sources of incremental demand in several states, clustering around available transmission capacity, fibre routes, and metropolitan demand centres.

Integration Focus

New connection rules can affect project timelines and costs, and influence design choices such as whether a developer invests in on-site storage, demand management, or control systems that improve a site's response to grid events.

SMA framed the draft rules as part of a broader push to keep the power system stable as both supply and demand change. "The recommendations published today are an important step toward ensuring that new forms of electricity demand integrate effectively into Australia's evolving energy system," Alexander said.

Regulators and market bodies have increased their focus on "large loads" as a category, covering data centres, electrified industrial projects, and some large commercial developments. The connection process for these loads intersects with broader policy aims on reliability, the transition to renewable energy, and efficient network investment.

Equipment suppliers and project developers are also watching the development of technical standards for inverters and control systems, particularly as grid operators introduce performance requirements for disturbance ride-through and reactive power response. These requirements have traditionally applied to generators, but demand-side connections have become part of the conversation as large loads proliferate and seek more flexible operating arrangements.

SMA positions itself as a supplier across solar, battery, and hybrid projects in Australia, noting that the same technology stack used in generation and storage projects can also be relevant for energy-intensive sites.

Stakeholders are expected to scrutinise the AEMC's draft rules as consultation progresses. Data centre developers, network businesses, equipment manufacturers, and consumer groups are likely to weigh how any final rules balance system security with timely connections for new investment.

"In the US, data centres have caused headaches for system operators. Advanced technology can reduce those impacts, and Australia's regulators continue to demonstrate leadership by getting ahead of the game," said Alexander.

Further discussion is expected between regulators, network operators, and large-load proponents on technical expectations for disturbance performance, and the role of on-site resources such as batteries and power conversion systems in managing system impacts.