Australia's Largest Gas Plant: EnergyAustralia's Data Centre Bet

EnergyAustralia has unveiled ambitious plans to build the nation's largest gas-fired power plant, a move driven by a surge in electricity demand from data centres and the impending retirement of coal-fired stations. This project aims to bridge what the company calls a 'gap of gigawatts' in Australia's energy supply. Below, we address key questions about the proposal, its rationale, and its implications for the energy transition.

1. What exactly is EnergyAustralia planning to build?

EnergyAustralia intends to construct a new gas-fired power plant that would be the largest ever built in Australia. The facility is designed to provide a significant baseload power source to meet rising electricity demand, particularly from the booming data centre industry. The plant will be a major addition to the National Electricity Market, with capacity likely in the range of several hundred megawatts, though exact specifications are yet to be finalized. The company positions this as a critical bridge solution while renewable energy and storage technologies scale up. Unlike many smaller peaking gas plants, this one will run more continuously to supply the steady load required by data centres and to compensate for retiring coal units.

2. Why is EnergyAustralia building this plant now?

The timeline is driven by two converging factors: the accelerated closure of Australia's aging coal-fired power stations and the explosive growth in electricity consumption from data centres. As coal plants retire, they remove gigawatts of stable, dispatchable power from the grid. Meanwhile, data centre demand is projected to soar, driven by cloud computing, AI, and digital services. EnergyAustralia forecasts a supply 'gap of gigawatts' that must be filled quickly to avoid reliability issues. Gas-fired generation is seen as the fastest and most scalable near-term solution, as it can be deployed more rapidly than large-scale renewables with storage and provides firm, on-demand power. The company wants to lock in this capacity before market tightness worsens.

3. How will this gas plant support data centre demand?

Data centres require highly reliable, 24/7 electricity to power servers and cooling systems. A single large data centre can consume as much power as a small town, and new hyperscale facilities planned for Australia will add hundreds of megawatts of continuous load. Renewable energy alone, while growing, is intermittent and currently insufficient to guarantee such constant supply without massive storage. EnergyAustralia's gas plant will provide that firm, dispatchable power. It can ramp up quickly to meet peak loads and run steadily during periods when solar and wind output is low. The plant is expected to be co-located near major grid connections and data centre hubs, ensuring efficient delivery. This gas backup is similar to strategies used in other markets where data centre operators sign power purchase agreements for gas-fired generation to ensure uptime.

4. What is the 'gap of gigawatts' that EnergyAustralia refers to?

EnergyAustralia's 'gap of gigawatts' describes the shortfall between retiring coal-fired capacity and the new generation needed to replace it plus meet additional demand. Australia is closing several coal power plants over the next decade, removing thousands of megawatts of baseload power. Simultaneously, data centres alone are forecast to require an extra 3–5 GW by 2030. Without new firm capacity, the grid faces reliability risks, especially during peak periods and when renewables underperform. The gap is not just a short-term blip; it represents a structural deficit that will widen as more coal exits. Gas-fired plants like the one proposed are designed to fill that gap until sufficient renewable energy with storage (such as pumped hydro or battery farms) can be built to take over. The company argues that delaying such investment could lead to higher prices and blackouts.

5. How does this plant compare to existing gas plants in Australia?

If built, this would be the largest gas-fired power plant in Australia's history, surpassing the existing biggest plants such as those in Queensland and Victoria. Current large gas plants typically have capacities around 500–600 MW, but EnergyAustralia's proposal is expected to be significantly larger, possibly exceeding 800 MW or more. The plant will be designed for high-efficiency combined-cycle operation, meaning it captures waste heat to generate extra electricity, making it more fuel-efficient and lower-emission compared to older open-cycle gas turbines. It will also feature modern emissions control technology. In terms of output, it will be capable of supplying enough electricity for hundreds of thousands of homes, with a large portion dedicated to data centre loads. The scale underscores the magnitude of the demand forecast.

6. What are the environmental concerns surrounding this project?

Environmental groups have raised alarms about locking in new fossil fuel infrastructure at a time when Australia needs to cut emissions rapidly to meet climate targets. Burning natural gas releases greenhouse gases, including methane leaks from extraction and transport. Although gas emits roughly half the CO2 of coal per unit of electricity, it is still a significant contributor. Critics argue that investing in gas plants risks stranding assets as renewables and storage become cheaper and more reliable. There are also concerns about local air quality impacts from NOx and particulate emissions. EnergyAustralia counters that the plant will replace dirtier coal generation and support the grid while renewables expand, and that it can later be converted to run on green hydrogen or carbon capture. However, the timeline for such transitions remains uncertain, making the project controversial.

7. What is the expected timeline for this gas plant?

EnergyAustralia has announced the plan but has not published a detailed construction timeline. Typically, a project of this scale would require several years for planning approvals, environmental impact assessments, and engineering design. If fast-tracked, construction could begin in late 2025 with commercial operation by 2028–2030. The company will need to secure financing, grid connection agreements, and likely a long-term power purchase agreement with a major data centre operator or other large user. The timeline will also depend on regulatory approvals from state and federal governments. Given the urgency of the 'gap of gigawatts,' EnergyAustralia is likely pushing for an accelerated schedule, but community opposition and permitting hurdles could cause delays. Updates are expected as the project progresses through feasibility studies.

8. How does this fit into Australia's broader energy transition?

The gas plant is positioned as a transitional solution within Australia's shift from coal to renewables. Many energy experts see gas as a 'bridging fuel' – necessary to maintain grid stability while solar, wind, and batteries scale up. However, the International Energy Agency and other bodies argue that new gas fields and plants are incompatible with net-zero goals unless paired with rapid decarbonisation. The federal government has offered support for gas development as part of its 'gas-led recovery' plan, citing energy security. Yet, state governments have mixed policies; some are promoting renewable zones and bans on new gas connections. The success of this plant will depend on Australia's ability to simultaneously deploy massive amounts of renewable energy and storage. If those technologies advance faster than expected, the gas plant may operate less than planned. Conversely, if delays occur, it will become critical for reliability. The debate encapsulates the tension between immediate energy needs and long-term climate ambitions.