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Hydro in Europe: Powering Renewables - Full Report - Eurelectric

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Hz (hertz) Unit of frequency <strong>in</strong> cycles per second<br />

kW (kilowatt) Unit of power equal to 1,000 watts<br />

kWh (kilowatt hour) Unit of energy equal to the use of 1,000 watts for one hour<br />

Load The amount of electric power delivered or required at any specific<br />

po<strong>in</strong>t or po<strong>in</strong>ts <strong>in</strong> the electricity system<br />

Load factor Measure of output of a power plant compared to the maximum<br />

output it could produce<br />

Load levell<strong>in</strong>g A method for reduc<strong>in</strong>g the large fluctuations that occur <strong>in</strong> electricity<br />

demand, for example by stor<strong>in</strong>g excess electricity dur<strong>in</strong>g periods of<br />

low demand for use dur<strong>in</strong>g periods of high demand<br />

MW (megawatt) Unit of power equal to one million of watts<br />

MWh<br />

hour)<br />

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

N1 criterion A rule applied to evaluate security of energy supply. It requires that <strong>in</strong><br />

case of tripp<strong>in</strong>g of a generation unit, a transmission l<strong>in</strong>e or a<br />

transformer, the security of energy supply should not be jeopardised<br />

NORDEL The Nordic Power System among Norway, Sweden, F<strong>in</strong>land and<br />

Denmark<br />

NREAP National Renewable Energy Action Plan<br />

Peak load The maximum electrical demand <strong>in</strong> a stated period of time.<br />

Primary control Automatically activated function of the turb<strong>in</strong>e governor to adjust the<br />

generator output of a unit as a consequence of a frequency deviation<br />

PSPP Pumped Storage Power Plant<br />

RBMP River Bas<strong>in</strong> Management Plan<br />

RES Renewable Energy Sources<br />

Secondary control The second frequency control level after primary control. Automatic,<br />

with purpose to restore frequency<br />

Sp<strong>in</strong>n<strong>in</strong>g reserves The plant capacity, <strong>in</strong> excess of actual load, which can be called on to<br />

produce electricity at very short notice<br />

TSO Transmission System Operators<br />

TW (terawatt) Unit of power equal to one trillion watts<br />

TWh (terawatt hour) Unit of energy equal to the use of one trillion watts for one hour<br />

UCTE Union for the Coord<strong>in</strong>ation of the Transmission of Electricity<br />

v RES Variable renewable energy sources (w<strong>in</strong>d and solar)<br />

w (watt) Unit of power<br />

WFD Water Framework Directive<br />

WWF World Wildlife Fund<br />

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