What is Bioenergy?

As the world grapples with the dual challenges of climate change and the depletion of fossil fuels, the search for sustainable and renewable energy sources has never been more critical. Bioenergy, or energy generated from biomass, is a promising solution to achieve a more secure and sustainable future.  
 
But, what is biomass? Biomass is a renewable energy source that consists of organic matter from plants and animals. Biomass can be made from agricultural residues like crop stalks and husks, forestry by-products such as wood chips and sawdust, food waste and animal manure.  
 
Biomass can be burned to produce heat or converted into liquid and gaseous fuels through different processes to generate energy. For example, liquid fuel can be created using sugarcane crop residues, while gas used for heating and power can be generated from animal manure.  
 
Bioenergy is the primary source of renewable energy used worldwide for a number of reasons. Firstly, unlike fossil fuels, which are finite and depleted over time, biomass can be continually replenished through agricultural and forestry practices to ensure a stable and long-term energy supply. 

Another benefit is its impressive track record of cost-effectively reducing carbon emissions. When biomass is used for energy, the carbon dioxide released during combustion is offset by the carbon dioxide absorbed by plants as they grow, making it a carbon-neutral process. This helps mitigate climate change by lowering the overall carbon footprint. 

Bioenergy is also effective at promoting waste management and reducing landfill by using waste material that would otherwise be discarded.  

Finally, the production and processing of biomass can create jobs and generate income in rural areas, boosting local economies and providing economic stability for farmers and communities. 

Put simply, bioenergy is generated by converting biomass into energy. But how? There are a number of processes that are commonly used to turn biomass into energy. These include:  
 
Combustion 
Combustion involves burning of materials like wood, crop residues, and organic waste to produce heat. This heat can then be used to heat buildings or generate electricity in power plants.  
 
Anaerobic digestion 
Anaerobic digestion involves biomass being broken down by microorganisms in an oxygen-free environment to produce biogas (mainly methane and carbon dioxide). Biogas can be used for heating, electricity generation, or as a vehicle fuel. The remaining solid material, called digestate, can be used as a fertiliser.  
 
Gasification 
Gasification involves heating biomass in a low-oxygen environment to produce syngas (a mixture of carbon monoxide, hydrogen, and methane). Syngas can be used to generate electricity, produce heat, or serve as a feedstock for producing liquid fuels and chemicals. 
 
Pyrolysis 
Pyrolysis involves subjecting biomass to high temperatures without oxygen, resulting in the production of bio-oil, syngas, and charcoal (biochar). Bio-oil can be refined into various fuels and chemicals, while biochar can be used as a soil additive. 
 
Fermentation 
Sugars and starches from crops like corn and sugarcane can be fermented by microorganisms to produce ethanol, a type of biofuel. This process is widely used for producing fuel for transportation. 
 
Transesterification 
The process of transesterification involves oils and fats from plants or animals chemically reacting with alcohol (usually methanol) to produce biodiesel, a renewable alternative to conventional diesel fuel. 

1. Gaia EnviroTech 
Gaia EnviroTech, located in regional Victoria, specialises in bioenergy and waste management. The company addresses two key issues: the rising costs associated with managing large amounts of organic waste and the need for on-demand renewable energy solutions to power business operations and lower carbon footprints. 
Image: HIVO - Asset 
 
2. Lytegro Limited  
LyteGro transforms waste bananas into BacLyte, a water-based extract that improves microbial processes like fermentation and bioenergy production. Their products boost microbial growth, efficiency, and yield, while reducing feedstock, water, and energy usage, all while reducing food waste. 
 
3. Enerkem  
Enerkem, a Canadian clean technology company, transforms residual biomass and non-recyclable municipal waste into biofuels and renewable chemicals. Their patented technology converts waste into methanol and ethanol, promoting sustainability and offering an alternative to landfilling and incineration. 
 
4. LMS Energy  
LMS Energy is Australia's largest landfill biogas company, specialising in methane capture and destruction. They convert landfill biogas into renewable energy, reducing the climate impact of waste by converting it into clean energy and preventing methane emissions. 
 
5. Gevo 
Gevo produces renewable gasoline, jet fuel, and diesel with zero carbon emissions. Focused on sustainable aviation fuel (SAF), Gevo also explores renewable natural gas and plastics. They innovate with low-carbon resources and advanced technologies to create fuels and chemicals that outperform fossil-based alternatives to help reduce greenhouse gases.