English Glossary

Since 02.06.2017

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automatic air vent

A device which releases air out of a system automatically but not fluid

auxiliary system

An additional heating device which will provide heat when the solar thermal system cannot (same as back-up system)

availability factor

The availability factor of a power plant is the amount of time that a power plant is able to produce electricity over a certain period, divided by the amount of the time in the period. Occasions where only partial capacity is available may or may not be deducted.

available cash flow

Total cash sources less total cash expenses before payment of debt service.

average debt service coverage ratio

The ratio between operating cash flow and debt service during any one-year period, used to determine a project’s debt capacity.

average energy demand

Average requirement for energy as an input to provide products and/or services.

average loan life

The average maturity for all repayments weighted by the principal outstanding.


average debt service coverage ratio


The entirety of all birds observable in a region.


Of or relating to birds of a particular region or period.

avoided costs

Estimated cost that electric utilities would have to pay either to generate power themselves, or to procure from another generator in the market. Commonly used as a benchmark in the industry to indicate the approximate value of new generation to utilities.

azimuth angle

The angle between true south and the point on the horizon directly below the sun.


back-up system

An additional heating device which will provide heat when the solar thermal system cannot (same as auxiliary system)

background noise level

Noise level already present in an environment, e.g. prior to the installation of a wind turbine.

Balance of System

All components of a PV system, excluding the PV modules. BoS includes components such as mounting structures, tracking systems, inverters and other electronics, transformers, cabling, connectors, switches, fuses, lightning and surge protection, and storage technologies in the case of off-grid systems. Sometimes even labor costs and land are considered to be a part of the BoS costs of a system.

balance sheet

The accounts which show assets, liabilities, net worth/shareholders’ equity.

balancing valve

A valve that controls fluid flow in a system (e.g. in parallel branches of a piping system)


The state or condition of being 'bankable'. A project is 'bankable' if it is considered capable of being financed (economically viable).


A project is 'bankable' if it is capable of being financed.


builders' all risk

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