The LDES Council estimates that as much as 8 terawatts of long-duration vitality storage capability might be wanted globally by 2040, doubtlessly unlocking $540 billion in annual grid financial savings. In opposition to that projection, the expertise pool able to delivering economically viable storage past 4 hours stays slender and largely unproven at business scale. The announcement by Victoria’s State Electrical energy Fee that it’ll deploy a 20 MW, 200 MWh compressed CO2 battery on the web site of the decommissioned Hazelwood energy station within the Latrobe Valley is subsequently greater than a single infrastructure dedication. It’s the first business deployment of this expertise in Australia and solely the second 20 MW-scale set up of Power Dome’s CO2 Battery anyplace on the planet, following the Sardinia unit that got here into full operation in July 2025.
The challenge specs, ten hours of steady discharge length, place it nicely above the two-to-four hour vary that characterises nearly all the battery storage deployed in Australia up to now. The SEC’s framing of the challenge is specific on this level: the state has constructed substantial shorter-duration battery capability however lacks any facility able to bridging multi-hour or multi-day renewable technology gaps. With Victoria’s coal and fuel fleet being progressively retired and its 2030 clear vitality goal requiring an more and more wind- and solar-dominated technology combine, the absence of agency long-duration storage is a structural vulnerability fairly than a planning hole.
How the CO2 Battery Works and What Distinguishes It
Power Dome’s system shops vitality thermodynamically fairly than electrochemically. Throughout charging, grid electrical energy compresses CO2 fuel into liquid kind and shops it in customary stress vessels at ambient temperature, a attribute that differentiates the expertise from typical compressed air vitality storage, which requires both underground caverns or cryogenic temperatures. The compression course of generates warmth that’s captured and saved individually. Throughout discharge, the liquid CO2 is re-expanded by a turbine, with the saved warmth used to enhance enlargement effectivity, producing electrical energy that’s returned to the grid. The CO2 itself will not be consumed however circulates in a closed loop, with a single 200 MWh unit requiring roughly 2,000 tonnes of the fuel.
The corporate claims a round-trip effectivity above 75% with no degradation over a 30-year-plus lifetime, a distinction with lithium-ion methods, which generally degrade measurably over a cycle lifetime of 10 to 12 years. The 75% round-trip effectivity determine was achieved on the Sardinia demonstration plant and has been independently cited in regulatory submissions to the UK Parliament. Alliant Power, which is deploying a 20 MW, 200 MWh CO2 Battery on the Columbia Power Centre in Wisconsin with a groundbreaking goal of 2026 and completion in late 2027, estimated the entire challenge price at between $60 million and $90 million, reflecting a capital price vary of $300 to $450 per kWh at this scale. Power Dome claims its capital expenditure is 1.7 instances cheaper than lithium-ion at comparable durations, a declare that’s broadly in line with the associated fee dynamics of longer-duration storage comparisons however requires qualification by discharge length: at 4 hours or much less, lithium-ion stays cost-competitive; the CO2 battery’s financial case strengthens as length extends past that threshold.
The Crucial Minerals Argument and Its Limits
Power Dome markets its expertise’s independence from lithium, cobalt, nickel, and different important minerals as a central differentiation. The CO2 battery makes use of metal, water, and CO2, all of which can be found from a number of international suppliers with no materials provide chain focus threat. For a jurisdiction like Victoria that’s concurrently scaling renewable technology and competing for battery provide chains which can be closely concentrated in China, the availability chain argument has real coverage resonance. The Hazelwood announcement notes explicitly that the expertise avoids important mineral provide chain publicity, language that displays each the SEC’s consciousness of lithium provide chain threat and the broader Australian authorities curiosity in lowering dependence on Chinese language-controlled battery provide chains.
The counterargument is that CO2 itself should be sourced, transported, and maintained throughout the system. A 200 MWh unit incorporates 2,000 tonnes of CO2, and the danger of a serious launch, whereas not a security hazard at poisonous concentrations, does create a localised displacement threat. Within the occasion of a dome puncture, the two,000 tonnes would enter the environment and require a 70-metre exclusion zone till the air cleared. Power Dome’s CEO, Claudio Spadacini, has characterised this as a negligible atmospheric affect, equal to roughly 15 transatlantic return flights on a big plane, and the comparability holds in purely volumetric phrases. The operational and allowing implications for urban-adjacent websites are a extra advanced query that the Hazelwood location partially addresses by offering a big, already-industrial web site with a longtime infrastructure footprint.
The Hazelwood Web site as an Enabling Issue
The selection of the previous Hazelwood energy station web site is operationally and symbolically vital. Hazelwood operated one of the vital carbon-intensive coal vegetation within the developed world earlier than closing in 2017, and the location has been present process a managed rehabilitation course of since. The SEC’s 143-hectare vitality innovation precinct adjoining to the plant supplies flat terrain, present grid connection infrastructure, and a medium-voltage connection functionality that Power Dome’s customary 200 MWh unit requires. The land footprint of roughly 5 hectares per customary unit suits comfortably throughout the precinct boundary.
The grid connection level at a former massive coal plant is especially invaluable for long-duration storage deployment. Transmission infrastructure constructed to hold lots of of megawatts of coal technology can accommodate storage belongings and new renewable connections with out requiring the expensive upgrades that greenfield grid connection initiatives in regional areas steadily encounter. The SEC’s indication that further initiatives are deliberate for the SEC Power Works precinct suggests it views the location as a platform for progressive LDES and new vitality expertise deployment fairly than a single demonstration dedication.
The place CO2 Battery Know-how Sits within the Business Panorama
Power Dome’s international pipeline exceeds 30 GWh throughout initiatives in Italy, the US, Eire, India, and now Australia. Google has partnered with the corporate on a multi-continent storage buildout, with the primary bilateral challenge underway in Eire. The LDES Council’s abatement price evaluation for comparable long-duration storage choices estimated a median abatement price in 2023 of roughly £106.83 per tonne of CO2, 83% decrease than battery-based alternate options for a similar long-duration position, declining to £97.13 per tonne in 2030 as batteries achieve extra operational alternatives in cleaner methods. That hole narrows however doesn’t shut, which supplies a foundation for continued funding in non-lithium long-duration applied sciences fairly than assuming price and efficiency convergence.
The Sardinia 20 MW plant’s July 2025 commissioning supplies the primary operational knowledge at business scale from which the Victoria challenge’s efficiency projections will be derived. One full 12 months of operation in a Mediterranean local weather with variable renewable technology supplies significant however not totally consultant knowledge for an Australian software, and the Latrobe Valley’s climate and grid circumstances will produce a unique operational profile. The SEC’s description of the challenge as a part of an innovation precinct fairly than a dedicated grid infrastructure programme implies that real-world efficiency knowledge from the Hazelwood set up will inform subsequent deployment selections, which is the suitable framing for expertise at this stage of its business trajectory.
