Ruqayyah Snyder
Biomass is an organic matter that can be used to produce energy. It is considered a renewable energy source because it comes from living or recently living organisms that can be replenished over time. Biomass is made from biological materials such as plants, wood, agricultural waste, and other organic materials. In Australia, biomass is primarily used to produce biofuels such as biodiesel and bioethanol, which are used as replacements for diesel and petrol, respectively. There are also a number of businesses producing bioenergy in Western Australia, such as Richgro garden products in Jandakot, which uses anaerobic digestion to convert food waste into biogas for energy production. Australia generates biomass-powered energy from 25 biomass power plants across the country, with a total capacity of 589.5 MW.
| Characteristics | Values |
|---|---|
| Definition of Biomass | Biological materials from trees, animals and food crop residues that are waste by-products of the main crop or livestock activity, including cereal straw, dairy effluent, offal, plantation residues, grape marc and tomato vines |
| Use of Biomass | Generating electricity and heat, producing liquid fuels for transport, heating, cooking, running turbines, powering cars and equipment with biofuels |
| Number of Biomass Power Plants in Australia | 25 |
| Total Capacity of Biomass Power Plants in Australia | 589.5 MW |
| Biofuel Production in Australia in 2018 | 290 million liters (250 ML of ethanol and 40 ML of biodiesel) |
| Biofuel Feedstocks Used in Australia | Tallow, used cooking oil and oilseeds |
| Australian States With Biofuel Mandates | Queensland and New South Wales |
| Australian Government's Stance on Native Forest Biomass | Excluded from eligibility as a renewable energy source under the national Renewable Energy Target |
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What You'll Learn
Biomass sources in Australia
Biomass refers to organic matter such as plants, wood, agricultural waste, and other organic materials that can be used to produce energy. Biomass is considered a renewable energy source because it comes from living or recently living organisms that can be replenished over time. It can be burned directly to produce heat or steam, which can then be used to generate electricity, or it can be converted into biogas or liquid biofuels through processes such as fermentation or gasification.
In Australia, biomass-powered energy is generated by 25 biomass power plants with a total capacity of 589.5 MW. Biomass sources in Australia include crop stubble, native grasses, pulpwood, and residues from plantations and native forests, bagasse, organic municipal solid waste, and new short-rotation tree crops. The largest contributor to biomass production is crop stubble, with an estimated annual potential availability of 27.7 Mt per year, followed by grasses at 19.7 Mt per year and forest plantations at 10.9 Mt per year.
Western Australian farmers produce over 10 million tonnes of waste biomass every year, which can be utilised to generate income by selling these by-products or producing biofuels for heat and energy generation. For example, Richgro garden products in Jandakot, south of Perth, uses anaerobic digestion to convert 100 tonnes of food waste per day into biogas for energy production and soil enrichment products.
Biomass energy has many uses, including heating, cooking, running turbines, and powering cars and equipment with biofuels. It offers the advantage of reducing greenhouse gas emissions by displacing fossil fuels and reducing waste by utilising organic materials that might otherwise be discarded. However, like all energy sources, biomass has its own environmental and social impacts, and its sustainability depends on factors such as the source, production methods, and overall energy system.
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Biomass use cases
Biomass refers to organic matter, such as plants, wood, agricultural waste, and other organic materials that can be used to produce energy. Biomass is considered a renewable energy source because it comes from living or recently living organisms that can be replenished over time.
Electricity Generation
Biomass can be used to generate electricity through direct combustion, gasification, or combined heat and power systems. Biomass power plants burn biomass directly to produce heat or steam, which is then used to generate electricity. In Australia, biomass currently accounts for 0.9% of electricity generation, but it is projected to provide between 19.8% and 30.7% of the country's electricity requirements by 2050.
Heat Generation
Biomass can be burned to produce heat directly. This is particularly useful for heating homes, businesses, and other buildings.
Liquid Biofuels
Biomass can be converted into liquid biofuels such as ethanol and biodiesel through processes like fermentation and gasification. These biofuels can be used as transportation fuels or blended with conventional fuels to reduce emissions. For example, ethanol can be created from corn, sugarcane, or potatoes, while biodiesel can be made from soybean oil or animal fats.
Bioenergy for Agriculture
Agricultural waste, such as crop residues and livestock waste, can be used as biomass to produce bioenergy. This provides an opportunity for farmers to generate income by selling these by-products or producing biofuels for heat and energy generation. Poultry farms, dairies, and piggeries, in particular, have the potential to significantly reduce costs and manage biomass waste on-site.
Aviation Fuel
In the Fitzroy Basin, Queensland, there has been an assessment of the potential for using biomass for aviation fuel production. This indicates the possibility of using biomass as a sustainable alternative to fossil fuels in the aviation industry.
The use of biomass in Australia holds potential for reducing greenhouse gas emissions, managing waste, and contributing to a more sustainable energy future. However, it is important to consider the environmental and social impacts, as well as the reconciliation of biomass harvesting with environmental protection.
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Biomass conversion methods
Biomass is a renewable energy source that comes from living or recently living organisms, such as biological materials from trees, animals, and food crop residues. It can be used to generate electricity, heat, or fuel. Australia generates biomass-powered energy from 25 biomass power plants across the country, with a total capacity of 589.5 MW.
Biological conversion methods include fermentation to make ethanol and anaerobic digestion to produce biogas. Ethanol is a type of biofuel that can be used as a vehicle fuel, while biogas, also known as biomethane or renewable natural gas, can be used in the same way as fossil fuel natural gas. Advanced technologies can also extract biofuels from materials such as wood, crops, and waste materials.
The choice of conversion technology depends on various factors, including the characteristics of the biomass, the desired end product, and the overall energy system in which it is used.
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Biofuel production in Australia
In 2021, Australia produced 180 million litres of fuel ethanol and 18 million litres of biodiesel. The main feedstocks for ethanol production in Australia are wheat starch and molasses (from sugarcane), while the main biodiesel feedstocks are tallow, vegetable oil, and used cooking oil. Biodiesel is defined by the Australian government as "a diesel fuel obtained by esterification of oil derived from plants or animals".
There are three major fuel ethanol production facilities in Australia, with a total capacity of around 440 million litres per year. Approximately 68% of this production occurs in New South Wales, at a single production facility in Nowra. There are also three established biodiesel producers in New South Wales and Queensland, with a total capacity of 440 million litres per year.
There has been a significant push in research and development of first-generation and second-generation biofuels in Australia, with a number of new ethanol plants proposed for the near future. However, there has been a dramatic decline in biodiesel consumption in Australia since 2015 due to unfavourable conditions such as limited mandate support, low international oil prices, and high feedstock prices. This has resulted in the closure of the majority of biodiesel production facilities in the country.
In terms of biomass energy, Australia has 25 biomass power plants across the country, with a total capacity of 589.5 MW. Biomass refers to organic matter, such as plants, wood, agricultural waste, and other organic materials, that can be burned directly to produce heat or steam, or converted into biogas or liquid biofuels through processes such as fermentation or gasification. Biomass is considered a renewable energy source because it is derived from living or recently living organisms that can be replenished over time.
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Environmental impact of biomass
Biomass refers to organic matter such as plants, wood, agricultural waste, and other organic materials that can be used to produce energy. Biomass is considered a renewable energy source because it comes from living or recently living organisms that can be replenished over time. It can be used to generate electricity, produce heat and fuel, and power cars and equipment with biofuels.
While biomass is a renewable energy source, it still has environmental and social impacts. The sustainability of biomass production and use depends on factors such as the source of the biomass, the production methods used, and the overall energy system in which it is used.
In Australia, there are concerns about the negative environmental impacts of biomass, particularly regarding native forest logging. Australia has excluded native forest biomass from eligibility as a renewable energy source under the national Renewable Energy Target, recognizing community concern about the impacts on forest biodiversity and the immediate loss of large intact carbon stores. There is limited knowledge about the potential capacity of biomass from sustainably managed forests to contribute to the expansion of a biomass bioenergy industry, and concerns about how to reconcile biomass harvesting with environmental protection.
However, biomass can also have positive environmental impacts. It can help reduce greenhouse gas emissions by displacing fossil fuels, and it can reduce waste by using organic materials that might otherwise be discarded. Additionally, estimates suggest that approximately 36% of felled tree biomass retained on-site can enhance long-term soil productivity, water quality, and site-level biodiversity values.
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Frequently asked questions
Biomass refers to organic matter, such as plants, wood, agricultural waste, and other organic materials, that can be used to produce energy.
Biomass is used to generate electricity or produce heat and fuel. Australia generates biomass-powered energy from 25 biomass power plants across the country.
There are two main types of biomass: bioethanol and biodiesel. Bioethanol is a colourless alcohol made by the fermentation of biomass, using glucose derived from sugar sources like sugar cane, sugar beet, or molasses. Biodiesel is usually made from vegetable oil, animal fats (tallow), or used cooking oil.
Biomass is considered a renewable energy source because it comes from living or recently living organisms that can be replenished over time. It can also help reduce greenhouse gas emissions by displacing fossil fuels and reduce waste by using organic materials that might otherwise be discarded.
Yes, like all energy sources, biomass has potential environmental and social impacts. For example, crop-based biofuels can contribute to deforestation, and the production of biodiesel can increase acidification and eutrophication. There are also concerns about the impact of biomass on forest biodiversity, with Australia excluding native forest biomass from being considered a renewable energy source.
