Sustainable Investment

Bioenergy

Bioenergy is an umbrella term given to technologies that derive renewable energy from recently living organic materials known as biomass, which can be used to produce transportation fuels, heat, electricity, and products.

Anaerobic Digestion

 

Anaerobic digestion (“AD”) is the process by which biodegradable wastes (organic materials such as food, agricultural wastes and crops) are broken down by naturally occurring micro-organisms in the absence of oxygen to produce a methane rich biogas. This biogas can either be used in a CHP engine to produce heat and electricity or upgraded to methane and injected into the gas grid. The AD process also produces a nutrient rich substrate which can be used as a substitute to chemical fertilisers.

A summary of the AD process is shown below.

Anaerobic Digestion

Biomass Combined Heat & Power (CHP)​

Biomass power technologies convert renewable biomass fuels into heat and electricity using processes similar to those employed with fossil fuels. At present, the primary approach for generating electricity from biomass is combustion direct-firing. The wood that is provided for the combustion direct-firing process is sourced responsibly in order to offset the CO2 which is produced from the burning.

Combustion systems for electricity and heat production are similar to most fossil-fuel fired-power plants. The biomass fuels burned in a boiler to produce high-pressure steam. This steam is introduced into a steam turbine, where it flows over a series of turbine blades, causing the turbine to rotate. The turbine is, in turn, connected to an electric generator. The steam flows over and turns the turbine. The electric generator rotates, producing electricity. This is a widely available, commercial technology.

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