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Hydro in Europe: Powering Renewables - Full Report - Eurelectric

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Glossary<br />

Ancillary services Services required by the transmission or distribution system<br />

operator to enable them to ma<strong>in</strong>ta<strong>in</strong> the <strong>in</strong>tegrity and stability of<br />

the transmission or distribution system as well as the power quality<br />

Base Load In a demand sense, the amount of power that varies only slightly over<br />

a time period. In a supply sense, a plant that operates at a constant<br />

level of generation<br />

Black start<br />

capability<br />

The capability of a generat<strong>in</strong>g unit to start up without an external<br />

power supply, called on as a means of restor<strong>in</strong>g supplies follow<strong>in</strong>g a<br />

major failure on all or part of the network. This service allows system<br />

operators to provide auxiliary power to more complex generation<br />

sources that could take hours or even days to restart.<br />

Black-out A short or long-term loss of electric power to an area<br />

Capacity factor Measure of productivity, the ratio of the actual output of a power<br />

plant over a period of time and its potential output if it had operated<br />

at full capacity the entire time<br />

CCGT Comb<strong>in</strong>ed cycle gas turb<strong>in</strong>e<br />

CO2<br />

Energy conversion<br />

rate<br />

Energy payback<br />

ratio<br />

Carbon dioxide, greenhouse gas, product of fossil fuel combustion<br />

Refers to the number of manipulations required until a primary<br />

natural resource, such as coal, is transformed <strong>in</strong>to electricity<br />

The energy produced dur<strong>in</strong>g the normal life span of a power plant<br />

divided by the energy required to build, ma<strong>in</strong>ta<strong>in</strong> and fuel the<br />

generat<strong>in</strong>g equipment<br />

ENTSO-E <strong>Europe</strong>an Network of Transmission System Operators for Electricity<br />

EU <strong>Europe</strong>an Union<br />

Frequency One of the key parameters for control of an electric transmission<br />

network; characterized by the balance between electricity generation<br />

and demand, on one hand, and by the control of the electricity<br />

network by appropriate technologies such as pumped storage<br />

hydropower plants, on the other<br />

FRMP Flood Risk Management Plan<br />

GHG Greenhouse gas<br />

Grid Network of transmission and distribution l<strong>in</strong>es carry<strong>in</strong>g electricity<br />

from sources of generation to consumers<br />

GW (gigawatt) Unit of power equal to one billion of watts<br />

GWh<br />

hour)<br />

(gigawatt Unit of energy equal to the use of one billion watts for one hour<br />

Head In a run-of-river hydropower plant the vertical height of water<br />

reservoir located above the turb<strong>in</strong>e<br />

HPP <strong>Hydro</strong>power plant<br />

HVDC high voltage direct current<br />

63

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