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Renewable energy generated from materials derived from biological sources, e.g. wood, organic waste, energy crops, agricultural residues. (Syn. biomass energy)


Biofuels are fuels which are derived from plants/biomass. The term covers liquid fuels and upgraded biogas for transportation purposes. Public and scientific interest in biofuels focusses on bioethanol and biodiesel.


Biogas is a gas produced in a decomposition process of suitable biomass utilizing micro-organisms. It is a flammable gas, as its energy carrier is methane, which is also a component of natural gas.

biological oxygen demand

The amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. The term also refers to a chemical procedure for determining this amount.


Material orgánico de organismos vivientes, o recientemente vivos tales como la madera, desperdicio orgánico y residuos agrícolas. La biomasa puede convertirse en otras formas utilizables de energía tales como el gas metano o en combustibles de transporte como el bioetanol y el biodiésel.

biomasa a líquido

(BTL por sus siglas en ingles) proceso en el cual la biomasa se convierte en un biocombustible líquido usando tecnologías de gasificación y síntesis.

biomasa sólida

Material de origen biológico reciente. La biomasa sólida abarca madera, materia vegetal y otros desechos biodegradables. La biomasa solida más comunmente utilizada es la madera con un contenido energético de aproximadamente 10-20 MJ/kg., usado por ejemplo en generación eléctrica y de calor.


Organic material from living organisms such as wood, organic waste, and agricultural residuals. Biomass can be converted into other usable forms of energy such as methane or liquid fuels (bioethanol, biodiesel).

biomass feedstock

Organic matter available on a renewable basis. Biomass includes forest and mill residues, agricultural crops and wastes, wood and wood wastes, animal wastes, livestock operation residues, aquatic plants, fast-growing trees and plants, and municipal and industrial wastes.

biomass to liquid

A process where biomass is being converted into liquid biofuel by using gasification and synthesis technologies.


Device for optimizing the anaerobic digestion of biomass and/or animal manure, and possibly to recover biogas for energy production. (Syn. digester)

bioreactor (sinón. digestor)

Dispositivo para la optimización de la digestión anaeróbica de la biomasa y/o estiércol animal y posiblemente de recuperar biogás para producción energética.

black start

The procedure to recover from a total or partial shutdown of the transmission system. This entails isolated power stations being started individually and gradually being reconnected to each other.

black start capability

Ability of a power plant to help restart the grid after complete breakdown. These power plants receive their electrical supply from an auxiliary generating plant.

blade angle

See pitch angle definition




Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety of Germany


Material (p.ej. cable) envuelto o bobinado en torno a un objeto (p.ej. armadura); espira: una vuelta del material bobinado.


biological oxygen demand


barrel of oil equivalent

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