Glossary

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Availability
The total energy available to the system, allowing for planned and forced maintenance, as a percentage of total energy capacity

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Baseload power stations
Low cost power stations that operate with a high capacity factor in order to meet the majority of the electricity demand

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Capacity factor
The ratio of a plant's actual usage to its total capacity
Carbon intensity
The ratio of carbon emissions per megawatt hour of generation
Carbon intensity per MWh
Emissions of CO2 (kg), per megawatt hour sent out
CCGT
Combined cycle gas turbine
CO2
Carbon dioxide
Combined cycle generation
A combined cycle power plant is the most efficient way to generate electricity. The combined cycle unit reuses the waste heat in a heat recovery steam generator (see sequential combustion and heat recovery steam generator)

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Energy sent out
The amount of electricity sent to the grid after the energy used by the power station
Environmental incident classifications Level 1-3
An event, usually contained to the site, which has minimal environmental effects. This also includes non compliances with business systems
Environmental incident classifications Level 4-5
An event leading to material or serious environmental harm and may result in prosecution

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Forced outage rate
The proportion of a plant's capacity that is unavailable as a result of forced maintenance

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GHG
Greenhouse gases
GI
Greenhouse Intensity - emissions of greenhouse gases sent out per megawatt hour
GJ
Gigajoule
GWh
Gigawatt hour = 1 billion watt hours

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Hedge contract
A contract between two counterparties used to manage the exposure to the volatile electricity spot market

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ISO
International Standards Organisation (also known as the International Organisation for Standardisation)

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Joule
Joule (J) is a unit of energy - defined as the energy expended in one second by an electric current of one Amp flowing through a resistance of one Ohm

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kV
kiloVolt - one thousand volts
kW
kiloWatt (see watt)
kWh
kiloWatt hour = 1,000 watt hours

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Lost time injury (LTI)
A work related and/or workplace incident resulting in a fatality, permanent disability or time lost from work of one day/shift or more where the employer has direct control over preventing the occurrence

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MJ
Megajoule
MWh
megawatt hour = 1 million watt hours

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NEM
National Electricity Market
Notifiable incident
An incident resulting in a person suffering a work injury that is a serious bodily injury, including a fatality, a work caused illness or a dangerous event
NOx
Oxides of nitrogen

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Output
Dispatched generation

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PJ
PetaJoule = 1,000,000,000,000,000 (quadrillion) Joules
Planned outage factor
The proportion of a plant's capacity to achieve full load when plant is not undergoing a planned outage

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Reliability
A measure of a generator's capability to achieve full load if the plant is not on a planned outage (ie for scheduled maintenance)
Renewable Energy Certificates
A form of 'currency' created by the Renewable Energy (Electricity) Act 2000 and used to demonstrate compliance with the requirements of the Government's mandatory renewable energy target
Reportable environmental incidents
Refers to incidents that result in a release to the environment which are notified to the Environmental Protection Agency (EPA) as a condition of license
Resource Operations Plan
A plan used to implement a Water Resource Plan in specified areas to maintain a balance between the water requirements of different users, while preserving the environmental value of the river

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Sent out generation
The amount of power exported to the electricity grid after the energy used by the power station itself
Sequential combustion
Sequential combustion is based on the simple concept of reusing heat, where the exhaust gases from the first turbine feed the combustor of the second
SOx
Oxides of sulphur
Spot market
The physical market managed by NEMMCo for the dispatch of generating units and dispatchable loads
Spot price
The half-hour average of the five-minute dispatch prices set by marginal generator

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TJ
TeraJoule = 1,000,000,000,000 (trillion) Joules

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Watt
A watt (W) is a measure of electricity. 1 watt = 1 volt x 1 amp = 1 joule/second

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Zero harm
No medical treatment injuries