English Glossary

Since 02.06.2017

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debt to equity ratio

A ratio of a company’s debt to its total capitalization. The higher the D:E Ratio the greater the financial leverage of the company.


dedicated energy crops


The decibel (dB) is a logarithmic unit used to express the ratio between two values of a physical quantity, often power or intensity. A decibel scaleis used to express sound power and pressure level. When measuring environmental noise, a weighting network is used which filters the frequency of sound, and is expressed as dB(A).

dedicated energy crops

Crops grown specifically for their fuel value. These include food crops such as corn and sugarcane, and non-food crops such as poplar trees and switchgrass. Can be distinguished into short-rotation woody crops harvested in 5 to 8 years, and herbaceous energy crops harvested annually.


"An amount the insurer will deduct from the loss before paying up to its policy limits. Most property insurance policies contain a per-occurrence deductible provision that stipulates that the deductible amount specified in the policy declarations will be subtracted from each covered loss in determining the amount of the insured's loss recovery. Usually, the amount of the deductible is not subtracted from policy limits.


When a covenant has been broken or an adverse event has occurred. A monetary default occurs when a repayment is not made on time. A technical default occurs when a project parameter is outside defined or agreed-upon limits, or a legal matter is not yet resolved.

delivered energy

Energy that is actually received and paid for by a customer. Or energy that is actually delivered to a load (appliance) as opposed to energy generated by a process or technology.

demand side energy efficiency

Energy efficiency measure that reduces the consumption of final energy by a more efficient use while the same level of useful energy is delivered.

demand side management

The practice of reducing electrical energy consumption and/or costs by changing usage patterns via incentives (e.g. time-of-day rates), negotiating more favorable energy supply agreements, etc. Also known as 'energy demand management'.


The percentage of ‘emptiness’ of a battery or bank of batteries. DoD is the opposite of state-of-charge (DoD = 1 – SoC).

dew point

The temperature at which water vapor condenses and becomes a liquid (dew). The exact temperature at which this occurs will depend on air pressure and air humidity.


Doubly-Fed Induction Generator


domestic hot water

differential temperature controller

A device that switches an output according to the temperature difference between two input temperatures

diffuse irradiation

Radiation received from the sun after reflection and scattering by the atmosphere and ground.


The treated/ digested effluent from the anaerobic digestion process. (Syn. Anaerobic digestion residues, digested biomass digested slurry)


Electronic component that allows current flow in one direction only. See 'blocking diode' and 'bypass diode'.

direct costs

"Costs that can be completely attributed to the production of specific goods or services. Direct costs refer to materials, labor and expenses related to the production of a product.

direct current

Electric current flowing in only one direction.

direct normal irradiation

Beam irradiation perpendicular to a surface. Measured in W/m2.

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