Carbon capture and storage (CCS) is a technology that can capture carbon dioxide CO2 emissions produced from fossil fuels in electricity, industrial processes which prevents CO2 from entering the atmosphere. Carbon capture and storage is also used to sequester CO2 filtered out of natural gas from certain natural gas fields. While typically the CO2 has no value after being stored, Enhanced Oil Recovery uses CO2 to increase yield from declining oil fields.
There are no currently-operating large-scale CCS projects in Australia, although the Gorgon gas project will qualify when it is fully operational. Despite multiple CCS demonstration projects at Australian coal-fired power stations, none of Australia's coal plants are currently capturing CO2 or have a time frame for doing so. Australian Treasury modelling finds that CCS is not expected to be commercially viable until the 2030s. [1] The Intergovernmental Panel on Climate Change (IPCC) estimates that the economic potential of CCS could be between 10% and 55% of the total carbon mitigation effort until 2100. [2]
In the 2017 budget, the Turnbull government announced the cessation of the Low Emissions Technology Demonstration Fund in the 2017 financial year and the cessation of business case funding for the Carbon Capture and Storage Flagships program in financial year 2019. [3] This is on top of the 2015 budget, where the Abbott government cut $460m from CCS research projects leaving $191.7m to continue existing projects for the next seven years. The program had already been cut by the previous Labor government and much of the funding remained unallocated. [4]
In Australia, the major emissions sites are in the Latrobe and Hunter valleys. The Latrobe Valley has considerable potential storage within a few hundred kilometres in Bass Strait which the CarbonNet Project was investigating (see below). There are no particularly promising large storage prospects near the Hunter Valley. Geologically prospective areas include the North West Shelf (see the Gorgon gas project below) and Bass Strait. Australia has very extensive basins with deep saline formations, both onshore and particularly offshore, in which large quantities of carbon dioxide can dissolve. In such formations Australia has a potential carbon dioxide storage resource equivalent to many hundreds of years of emissions at the current rate. Work is now underway to fully assess storage potential. [7]
In November 2008, the Australian Commonwealth Government passed the Offshore Petroleum Amendment (Greenhouse Gas Storage) Act 2008, which provides a regulatory framework for carbon dioxide storage in federal offshore waters.
The Victorian Greenhouse Gas Geological Sequestration Act 2008 (No. 61 of 2008) received Royal Assent on 5 November 2008. It provides a dedicated legal framework enabling the onshore injection and permanent storage of greenhouse gas substances. The state government has also developed a regulatory framework for offshore storage sites (i.e. those sites falling within the 3 nautical mile extent of state jurisdiction; the Offshore Petroleum and Greenhouse Gas Storage Act 2010. [8]
Both Australia's state and federal governments have been major contributors to CCS research and development. Federal government CCS initiatives include the CO2CRC (founded 2003), the Low Emission Technology Demonstration Fund (2004-2017), funding for the Asia-Pacific Partnership on Clean Development and Climate (2006-2011, renewables, CCS and other), National Low Emissions Coal Initiative (founded 2008), Global CCS Institute (founded 2009), Carbon Capture and Storage Flagships (2009-2019), the Carbon Capture and Storage Research Development and Demonstration Fund (2015-2016) and the National CO2 Infrastructure Plan operated by Geoscience Australia (2012-2016). [9]
Federal funding commitments to these initiatives total $3.5-3.6 billion, of which $1.3-$1.6 billion has been committed or is expected to be committed. [9]
In February 2017, Prime Minister Malcolm Turnbull said: [10]
We've invested $590 million since 2009 in clean coal technology research and demonstration and yet we do not have one modern high-efficiency low-emissions coal-fired power station, let alone one with carbon capture and storage.
In April 2018, a parliamentary inquiry heard from energy researchers that carbon capture and storage requires a price on carbon to be viable. [11]
There are no large-scale commercial CCS projects within Australia. The Global CCS Institute defines "large-scale" as 400,000 tonnes of CO2 per annum, or 800,000 tonnes per annum for a coal plant. [12] It previously used a one million tonnes per annum threshold. [13]
Demonstration and proposed projects and projects under construction are listed below with brief descriptions.
The CO2CRC Otway Project in Western Victoria is a demonstration project which has injected and stored over 65,000 tonnes of carbon dioxide in a depleted natural gas reservoir 2 km below the Earth's surface. The project was first proposed to the Board of the then Australian Petroleum Cooperative Research Centre (APCRC) in March 1998. [14] There has been no sign of leakage according to a comprehensive monitoring and verification program. A mixture of Carbon dioxide and methane gas is extracted from a well in the Bathurst field, then compressed and transported via dedicated pipeline to the Naylor field two kilometres away. The gases are then injected into the depleted gas reservoir through a dedicated injection well. A nearby well (previously used to produce natural gas) is used to monitor the injected carbon dioxide. A second stage of the project, involving evaluation of carbon dioxide storage in deep saline formations, has been highly successful and provided data on estimating CO2 storage capacity using an innovative single well test. The project is Australia's first demonstration of geosequestration and one of the world's largest geosequestration research projects. [15] This area has active exploration for geothermal and petroleum resources and has been supported by geotechnical work completed by the public sector and the private sector.
The Latrobe Valley Post Combustion Capture Project was a joint collaboration between Loy Yang Power, International Power Hazelwood, government and researchers from CSIRO's Energy Transformed Flagship and CO2CRC (including Monash and Melbourne Universities), involving research at both Loy Yang and Hazelwood power stations. The 10.5-metre-high pilot plant at Loy Yang was designed to capture up to 1,000 tonnes of CO2 per annum from the power station's exhaust-gas flues. Future trials were expected to involve the use of a range of different CO2-capture liquids. On 9 July 2008, CSIRO Energy Technology Chief Dr David Brockway announced that carbon dioxide (CO2) had been captured from power station flue gases in a post-combustion-capture (PCC) pilot plant at Loy Yang Power Station in Victoria's Latrobe Valley. The purpose of the pilot plant is to conduct research, not to capture all the emissions from the power station. [16]
Further government projects in this area led to many geo-technical studies that review gas and liquid migration, trapping and leakage. While the Gippsland area has been described as a basin margin, this is somewhat vague. The area defines a major fold belt onshore and offshore. The key risk to injection of CO2 in the area is the ability to keep gas in the ground. Multiple regional and local studies over the area have been completed by government and private companies. [17]
In 2016, the PICA Post-Combustion Project was announced. This is a joint collaboration between CSIRO, IHI Corporation (Japanese technology provider) and AGL. It will use a pilot plant to test CO2-capture liquids over a two-year period. [18]
CO2CRC commissioned three carbon dioxide capture research rigs at HRL's gasifier research facility at Mulgrave in Melbourne, Victoria. The CO2CRC rigs captured carbon dioxide from syngas, the product of the brown coal gasifier, using solvent, membrane and adsorbent technologies. The capture technologies are equally applicable to syngas from brown and black coal, gas or biomass fuels. During the project, researchers evaluated each technology for efficiency and cost-effectiveness. Advanced gasifier technologies are highly suitable for carbon dioxide capture for CCS as they produce a concentrated stream of carbon dioxide. [19]
The CO2 to liquid fuel project proposes a game changing technology for conversion of solar energy to liquid fuels. Both solar heat and solar PV electricity will be used to drive a solid oxide electrolyser device for a production of hydrogen and syngas which then can be converted onsite into transportable liquid fuels enabling large-scale energy export and storage. [20] [21]
This project led by Chevron will be designed to capture 3.5 Mt of carbon dioxide per annum from Greater Gorgon gas fields and store it in the Dupuy formation beneath the Barrow Island. The project will be the largest carbon dioxide sequestration operation in the world. [22] Chevron is liable for leaks and other damage during the project's lifetime and for 15 years afterwards, [22] but in 2009 the state and federal governments agreed to indemnify Chevron against liability for the project after that time, [23] with the Commonwealth in 2015 confirming it would adopt 80% of the liability and WA the remaining 20%. [24]
When construction on the project began in 2009, it was expected to be completed by 2014 [25] - including carbon capture and storage. [22] The project ultimately started extracting gas in February 2017 but carbon capture and storage was delayed multiple times. A delay until March 2019 [26] resulted in a further five million tonnes of CO2 to be released, because:
A Chevron report to the State Government released yesterday said start-up checks this year found leaking valves, valves that could corrode and excess water in the pipeline from the LNG plant to the injection wells that could cause the pipeline to corrode. [27]
In May 2018, the WA Environmental Protection Authority announced an investigation into whether Gorgon could meet its storage commitments given the delays. [28] In March 2019, Chevron announced that carbon capture and storage was delayed by another nine months, which would result in the release of a further 7.9 to 11.1 million tonnes of CO2. [29]
WWF claims that the Gorgon geosequestration project is potentially unsafe as the area has over 700 wells drilled in the area, 50 of which reach the area proposed for geosequestration of CO2. Fault lines compound the problems. Barrow Island is also an A class nature reserve of global importance. [30]
In April 2018, the federal and Victorian governments announced a brown coal-to-hydrogen project that would operate out of AGL Energy's Loy Yang A power station. Construction is expected to begin in 2019, and hydrogen production by 2020 or 2021. [31]
The pilot program will not include carbon capture and storage, [32] but it is expected if the project is expanded, with proponent Kawasaki Heavy Industries says that coal-to-hydrogen technology is not commercial without it. [33]
CarbonNet was established by the Victorian Government in 2009 to investigate the potential for establishing a world class, large-scale, multi-user carbon capture and storage network in Victoria. [34] In 2012 the Australian Government selected CarbonNet as one of only two CCS flagship projects under its Clean Energy Initiative and, with the State of Victoria, awarded the project a further $100 million in joint funding to undertake feasibility. The Global CCS Institute provided $2.3 million in support.
In 2016 it was reported that "When Australia repealed the carbon price the project did not advance", [35] but as of January 2018 the project was conducting a 17-day seismic survey of former oil wells in the Gippsland Basin. [36]
The Callide Oxyfuel Project was the largest oxyfuel demonstration in the world when it completed its demonstration phase in March 2015. It demonstrated carbon capture using oxyfuel combustion, but did not attempt carbon storage. Oxyfuel technology enables coal to burn efficiently in oxygen (rather than air as in a conventional power station), reducing emissions and producing carbon dioxide in a more concentrated form, allowing it to be stored and extracted. [37]
The Oxyfuel boiler operated for two years and nine months, beyond the project's expected duration, and achieved a capture of 75 tonnes of CO2 per day (27,300 tonnes per annum). The project team assessed eight potential carbon storage sites but these were unsuitable because of location, availability and geological profile. [38]
By capturing the CO2 produced from the combustion of the feed coal, which would otherwise be released to the atmosphere, the project demonstrated that using carbon capture technology, deep cuts could be made to power station emissions to help slow the process of climate change whilst maintaining the use of fossil fuels as major energy sources. [39]
The project was a joint venture partnership comprising CS Energy, ACA Low Emissions Technologies (ACALET) (now called COAL21), Glencore, Schlumberger Carbon Services, and Japanese participants J-Power, Mitsui & Co., Ltd [40] and IHI Corporation. The project was awarded $63 million from the Commonwealth Government under the Low Emissions Technology Demonstration Fund and received additional financial support from ACALET and the Japanese and Queensland governments, and technical support from JCOAL. Total investment in the project, covering capital works and operations and maintenance was $250 million. It was a project for the Asia-Pacific Partnership on Clean Development and Climate. [41]
The Callide Oxyfuel Project demonstrated the production of electricity from coal with almost no power station emissions to the atmosphere by capturing a major portion of the flue gas CO2 as liquefied gas, and other waste gases such as oxides of nitrogen (NOx), oxides of sulphur (SOx), and heavy metals in condensate form. The project involved the following key technologies and activities:
The project demonstrated more than 10,000 hours of oxy-combustion and more than 5,000 hours of carbon capture. [39] [42]
The Callide Oxyfuel Project demonstrated that new technology could be applied to an old power station to produce cleaner electricity. Built in the 1960s, the Callide A Power Station near Biloela in Central Queensland was chosen as the project’s demonstration site. Retrofitting the Callide A Power Station with oxyfuel technology represented a low-risk and cost- and time-effective way to demonstrate clean coal technology on an industrial scale, and represented a new stage in the station’s history.
In 2017, Martin Moore, chief executive officer of project proponent CS Energy said of the Callide project: [43]
We proved that technologically it’s possible to retrofit [CCS] to existing coal-fired plants, but commercially, the numbers don’t stack up … It’s unlikely there will be [a commercial operation for CCS in Australia], I think that technology may well be bypassed … simply because of the economics. … If you could decarbonise coal by capturing and sequestering the emissions, then you’d have clean coal. It sounds easy if you say it fast enough, but it’s not that simple.
A post-combustion capture plant operated at the International Power GDF Suez Hazelwood Power Station.
When announced in 2007, the project was originally planned as a retro-fit of one of Hazelwood's eight generating units, which would have reduced its emissions intensity by 20% (500,000 tonnes per annum). It was offered a $50 million federal government grant from the Low Emissions Technology Development Fund and a $30 million Victorian government grant from the Energy Technology Innovation Strategy. [44]
A pilot program with a more modest capture objective was completed. The solvent capture plant cost $10 million (including grants from state and federal governments) and began operation in 2009, capturing and chemically sequestered CO2 at a nominal rate of 10,000 tonnes per annum. [45]
Hazelwood Power Station closed in March 2017.
On 2 December 2008 Shell and Anglo American announced that this possible brown coal project in the Latrobe Valley will not proceed at present. They have described it as a "long term" opportunity. [46]
The planned project was planned to have some CCS, storing the gas captured in depleted off-shore oil fields in the Gippsland Basin in east Bass Strait. [47]
A proposed $2 billion "hydrogen energy" coal-to-gas plant will not proceed because the geological formations off Perth, which were intended to sequester the CO2, contain gas "chimneys" that "mean it is next to impossible to establish a seal in the strata that could contain the CO2". [48]
The Zerogen powerstation project near Stanwell power station in Queensland is proposed to be a 100 MW "Integrated Gasification Combined Cycle" power station with CCS. [49] In late 2010, the Government of Queensland announced it would not fund the Zerogen project because it was not economically viable and that it would be sold off. [50]
The Fairview Project, near Roma in South West Queensland, was intended to capture 1/3 of the CO2 emissions from a 100 MW coal seam methane gas-fired power station. In 2006 it was selected to receive federal government funding, [51] but as of September 2017 it does not appear on the Global CCS Institute's list of projects. [52]
Drax power station is a large biomass power station in Drax, North Yorkshire, England, capable of co-firing petroleum coke. It has a 2.6 GW capacity for biomass and 1.29 GW capacity for coal. Its name comes from the nearby village of Drax. It is situated on the River Ouse between Selby and Goole. Its generating capacity of 3,906 megawatts (MW) is the highest of any power station in the United Kingdom, providing about 6% of the United Kingdom's electricity supply.
A fossil fuel power station is a thermal power station which burns a fossil fuel, such as coal or natural gas, to produce electricity. Fossil fuel power stations have machinery to convert the heat energy of combustion into mechanical energy, which then operates an electrical generator. The prime mover may be a steam turbine, a gas turbine or, in small plants, a reciprocating gas engine. All plants use the energy extracted from the expansion of a hot gas, either steam or combustion gases. Although different energy conversion methods exist, all thermal power station conversion methods have their efficiency limited by the Carnot efficiency and therefore produce waste heat.
The National Energy Technology Laboratory (NETL) is a U.S national laboratory under the Department of Energy Office of Fossil Energy. NETL focuses on applied research for the clean production and use of domestic energy resources. It performs research and development on the supply, efficiency, and environmental constraints of producing and using fossil energy resources while maintaining affordability.
Coal pollution mitigation, sometimes called clean coal, is a series of systems and technologies that seek to mitigate the health and environmental impact of coal; in particular air pollution from coal-fired power stations, and from coal burnt by heavy industry. Primary focus is on removing sulfur dioxide and nitrogen oxides, the most important gases which caused acid rain; and particulates which cause visible air pollution, illness, and premature deaths. Reducing fly ash reduces emissions of radioactive materials. Mercury emissions can be reduced up to 95%. Capturing carbon dioxide emissions from coal is also being pursued.
Carbon capture and storage (CCS) is a process in which a relatively pure stream of carbon dioxide (CO2) from industrial sources is separated, treated and transported to a long-term storage location. For example, the carbon dioxide stream that is to be captured can result from burning fossil fuels or biomass. Usually the CO2 is captured from large point sources, such as a chemical plant or biomass plant, and then stored in an underground geological formation. The aim is to reduce greenhouse gas emissions and thus mitigate climate change. The IPCC's most recent report on mitigating climate change describes CCS retrofits for existing power plants as one of the ways to limit emissions from the electricity sector and meet Paris Agreement goals.
Enhanced oil recovery, also called tertiary recovery, is the extraction of crude oil from an oil field that cannot be extracted otherwise. Although the primary and secondary recovery techniques rely on the pressure differential between the surface and the underground well, enhanced oil recovery functions by altering the chemical composition of the oil itself in order to make it easier to extract. EOR can extract 30% to 60% or more of a reservoir's oil, compared to 20% to 40% using primary and secondary recovery. According to the US Department of Energy, carbon dioxide and water are injected along with one of three EOR techniques: thermal injection, gas injection, and chemical injection. More advanced, speculative EOR techniques are sometimes called quaternary recovery.
An integrated gasification combined cycle (IGCC) is a technology using a high pressure gasifier to turn coal and other carbon based fuels into pressurized gas—synthesis gas (syngas). It can then remove impurities from the syngas prior to the electricity generation cycle. Some of these pollutants, such as sulfur, can be turned into re-usable byproducts through the Claus process. This results in lower emissions of sulfur dioxide, particulates, mercury, and in some cases carbon dioxide. With additional process equipment, a water-gas shift reaction can increase gasification efficiency and reduce carbon monoxide emissions by converting it to carbon dioxide. The resulting carbon dioxide from the shift reaction can be separated, compressed, and stored through sequestration. Excess heat from the primary combustion and syngas fired generation is then passed to a steam cycle, similar to a combined cycle gas turbine. This process results in improved thermodynamic efficiency, compared to conventional pulverized coal combustion.
Callide Power Station is an electricity generator at Mount Murchison, Shire of Banana, Queensland, Australia. It is coal powered with eight steam turbines with a combined generation capacity of 1,720 megawatts (MW) of electricity. Callide A was commissioned in 1965, refurbished in 1998 and decommissioned in 2015/16. As of 2018, generation capacity was 1510 MW.
Oxy-fuel combustion is the process of burning a fuel using pure oxygen, or a mixture of oxygen and recirculated flue gas, instead of air. Since the nitrogen component of air is not heated, fuel consumption is reduced, and higher flame temperatures are possible. Historically, the primary use of oxy-fuel combustion has been in welding and cutting of metals, especially steel, since oxy-fuel allows for higher flame temperatures than can be achieved with an air-fuel flame. It has also received a lot of attention in recent decades as a potential carbon capture and storage technology.
Mongstad Power Station is a natural gas-fired combined power plant and heating plant located at the industrial site of Mongstad in Norway.
The milestones for carbon capture and storage show the lack of commercial scale development and implementation of CCS over the years since the first carbon tax was imposed.
Bioenergy with carbon capture and storage (BECCS) is the process of extracting bioenergy from biomass and capturing and storing the carbon, thereby removing it from the atmosphere. BECCS can be a "negative emissions technology" (NET). The carbon in the biomass comes from the greenhouse gas carbon dioxide (CO2) which is extracted from the atmosphere by the biomass when it grows. Energy ("bioenergy") is extracted in useful forms (electricity, heat, biofuels, etc.) as the biomass is utilized through combustion, fermentation, pyrolysis or other conversion methods.
The Kędzierzyn Zero-Emission Power and Chemical Complex was a proposed facility in Kędzierzyn-Koźle, Poland. It was planned to combine the functions of power and heat generation with chemical production and carbon capture and storage. The project was proposed by a consortium of chemicals producers, including Zakłady Azotowe Kędzierzyn and the electricity company Południowy Koncern Energetyczny. The facility would have produced synthesis gas by gasification of hard coal. Gas produced by the plant would have been used for power and heat generation, or for the production of other chemicals. The carbon dioxide (CO2) produced by this plant would have been stored in natural geological reservoirs, or used as a raw material for the production of synthesis fuels, fertilizers or plastics.
Boundary Dam Power Station is the largest coal fired station owned by SaskPower, located near Estevan, Saskatchewan, Canada.
Eston Grange Power Station was a proposed power station to be situated near to Eston in Redcar and Cleveland. If built, it would have been the UK's first pre-combustion carbon capture and storage (CCS) plant. The station could have generated up to 850 megawatts of electricity, enough to supply around a million people with electricity. The station would use standard oil refinery technology to turn gasified coal into hydrogen and carbon dioxide.
Calcium looping (CaL), or the regenerative calcium cycle (RCC), is a second-generation carbon capture technology. It is the most developed form of carbonate looping, where a metal (M) is reversibly reacted between its carbonate form (MCO3) and its oxide form (MO) to separate carbon dioxide from other gases coming from either power generation or an industrial plant. In the calcium looping process, the two species are calcium carbonate (CaCO3) and calcium oxide (CaO). The captured carbon dioxide can then be transported to a storage site, used in enhanced oil recovery or used as a chemical feedstock. Calcium oxide is often referred to as the sorbent.
Petra Nova is a carbon capture project designed to reduce carbon emissions from one of the boilers of a coal burning power plant in Thompsons, Texas. It is a multi-million dollar project taken up by NRG Energy and JX Nippon Oil to retrofit one of the boilers at their WA Parish Generating Station with a post-combustion carbon capture treatment system to treat a portion of the atmospheric exhaust emissions from the retrofitted boiler.
The Gorgon Carbon Dioxide Injection Project is part of the Gorgon Project, one of the world's largest natural gas projects. The Gorgon Project, located on Barrow Island in Western Australia, includes a liquefied natural gas (LNG) plant, a domestic gas plant, and a Carbon Dioxide Injection Project.
Direct air capture (DAC) is the use of chemical or physical processes to extract carbon dioxide directly from the ambient air. If the extracted CO2 is then sequestered in safe long-term storage, the overall process will achieve carbon dioxide removal and be a "negative emissions technology" (NET). As of 2023, DAC has yet to become profitable because the cost of using DAC to sequester carbon dioxide is several times the carbon price.
This reflects a number of terminating measures, including the cessation of the Low Emissions Technology Demonstration Fund and Coal Mining Abatement Technology Support Package in 2016-17, and the cessation of funding for the development of a detailed business case for the National Radioactive Waste Management Facility and Carbon Capture and Storage Flagships programs in 2018-19.