There are some concerns that CCUS is ‘new’ and ‘unproven’. This is false. CCUS has been utilised for decades as demonstrated by Norway’s Sleipner project. CCUS makes use of commercially available proven technologies. There are 21 commercial scale CCUS projects globally and a healthy pipeline of projects under construction. Governments and industry could facilitate improved confidence through public messaging on the technology readiness of CCUS.
Domestic demonstration projects such as the CO2CRC’s Otway project and the Callide Oxyfuel Project are important but their successes have been largely undersold by governments and industry. Public messaging could be improved by focusing more on the outcome of emissions abatement and all approaches to achieve it and less on particular technologies that may assist.
Trust in governments and industry is an ongoing challenge in modern economies. Credible third-parties, particularly the scientific community can greatly assist the community acceptance of CCUS.
The University of Queensland and COAL21 show that factual information alleviates the concerns of most communities. Increased understanding of the technology and processes enables increased acceptance.10
More specifically, community concerns relate to the safe, permanent storage that does not impact water quality or other aspects of the environment.
Injection into deep underground geological structures currently offers the best prospects for CO2 storage given the quantities of gas involved. Various other options for CO2 storage including biological means are also being explored.
CO2 and numerous other gases/substances are managed on a regular basis as part of current petroleum and resource-extraction activities. Capture and transport of CO2 is also not a new technology or idea. Specifically:
• Large quantities of CO2 streams are safely transported by pipeline every day without any adverse consequences
• Immense quantities of extracted natural gas are stored in the subsurface in many parts of the world
• There are massive quantities of gas (including carbon dioxide) trapped naturally in the subsurface under parts of Australia which are not regarded as constituting a safety hazard to the general public
• Fluids are injected into the subsurface every day throughout the world. These projects have provided a knowledge base for the regulatory control of the injection of fluids into the subsurface.
While many of the pieces of a CCUS regulatory regime are already in place and longstanding within the Australian petroleum and minerals industry, the development of an Australian regulatory and approvals system for CCUS will be underpinned by key requirements. These are that the regulatory system should be:11
• Focussed on safeguarding public interest, particularly to minimise risks to health, safety, environment, economic consequences and government accountabilities
• Based on sound risk management principles, be science-based and rigorous yet practical in approach
• Clear and consistent in laying out rights and responsibilities of participants
• Efficient (cost-effective) from participant, government and community viewpoints
• Timely and comprehensive in considering planning and approval requests
• Adaptable and learning-oriented to leverage experience in future developments in technologies, markets and institutional arrangements
• Flexible to allow for future government decisions regarding possible greenhouse policy measures
• Consistent with obligations under international law.
Adherence to these key guidelines in the development of a regulatory and approvals framework for CCUS will help gain community confidence and also provide a sound basis for industry investment. Such a framework will need to take into account the entire life cycle of a CCUS project.
Some common questions regarding CCUS are:
Has successful storage been achieved and is it safe?
Yes, the Sleipner project is the best, long term example. It has been storing approximately 0.9 million tonnes of CO2 per year in a deep saline formation under the North Sea off the coast of Norway since 1996.
Importantly, CO2 is a stable substance and, provided the well-established industrial safety protocols are followed, the injection process can be conducted without any threats to the health and safety of workers or the public.
Who is involved in CCUS around the world and where are the projects taking place?
There are currently 21 large scale CCUS projects in operation or under construction around the world, with a combined capacity to capture around 40 million tonnes of CO2 per annum. Several other large scale projects are in various stages of planning.
The first commercial CCUS project in the power sector, SaskPower’s Boundary Dam project in Canada, began in late 2014. The second, Petra Nova’s coal-fired power plant located near Houston, Texas, began in 2017. These are of global significance as they show CCUS operating in the power sector.
In the Middle East, the Abu Dhabi Carbon Project is the first commercial CCUS project in the iron and steel sector.
Does carbon dioxide leak from its storage site?
No, CO2 will not leak from the storage site provided it is established and operated correctly.
There are examples in nature where large volumes of CO2 have been trapped in geological formations for millions of years without leakage. However, replicating this natural process is a relatively new practice and it is being developed with appropriate precautions.
Prior to injection commencing, the geological formation in which the CO2 is to be stored is exhaustively studied to ensure its suitability. This includes establishing the boundaries of the reservoir, which provide an effective seal to prevent leaking, either to the surface or to adjacent geological formations.
Throughout the period of injection, and for many years after injection ceases, the CO2 is carefully monitored to ensure any undesired events are detected early so that effective remedial action is promptly taken.
Please also refer to answers to Question 8.