AEMO Glossary C
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The primary constituent element of organic structures, especially fossil fuels. When burnt it produces carbon dioxide emissions, the principal greenhouse gas responsible for global warming.
carbon dioxide - co2
A gas that is emitted from the combustion of carbon based fuel, such as fossil fuels or wood. The most significant greenhouse gas. It is also found naturally in oil and gas reservoirs, and when released is described as a fugitive emission
Carbon dioxide equivalent - co2-e
Trace gases, such as Methane and Nitrous Oxides have a greater global warming effect, by weight, than Carbon Dioxide. The Carbon Dioxide Equivalent is the conversion of all greenhouse gases into an equivalent weight of Carbon Dioxide that would have the same warming impact
carbon dioxide equivalent intensity index
An index published by AEMO that is the average carbon intensity, in tonnes of carbon dioxide equivalent gas produced per Megawatt Hour of generation for generators in that region of the NEM
Carbon Pollution Reduction Scheme
A proposed emissions cap and trade scheme proposed by the Rudd government . Failed to gain senate passage in December 2009 and withdrawn in 2010. Was superceded by the Gillard government's "Clean Energy Futures Scheme" in 2011.
A process to dispatch scheduled generating units and scheduled loads in order to balance power system supply, and to maximise the value of spot market trading on the basis of dispatch offers and dispatch bids.
National Electricity Rules definition :
The process managed by AEMO for the dispatch of scheduled generating units, semi-scheduled generating units, scheduled loads, scheduled network services and market ancillary services in accordance with rule 3.8.
A distribution hub where gas is reduced in pressure before it enters the lower pressure, smaller diameter, distribution pipeline network. OR A connection point where gas is redued in pressure before it enters the lower pressure, smaller diameter, distribution pipeline network.
The production of two ro more forms of energy from one fuel source. In general, cogeneration plants produce steam and electricity from natural gas.
Combined cycle gas turbine (CCGT)
Combines cycle technology uses both gas and steam turbine cycles in a single plant to produce electricity with high conversion efficiencies and low emissions.
A limitation on the capability of a network, load, or a generating unit such that it is unacceptable to either transfer, consume or generate the level of electrical power that would occur if the limitation was removed.
An event affecting the power system that is likely to involve an electricity generating unit's or transmission element's failure or removal from service.
An event affecting the power system, such as the failure or unplanned removal from operational service of a generating unit or transmission network element.
Gas that is supplied under contingency gas arrangements, which may be called when normal market processes are not expected to keep pipeline pressures within their operating limits. National Gas Rules Definition :
The quantity, timing and location requirements, for increased or decreased flows of natural gas to or from a hub on the current or the next gas day to meet an operational requirement associated with actual or forecase adverse operating conditions at a hub, where that operational requirement is unlikely to be met through the normal operation of the STTM.
Services provided by registered participants that enable the maintenance or restoration of power system security, or both. This includes, for example, actual active and reactive power capacities, which can be made available and used when a contingency event occurs.
cumulative price threshold
A price limit that, if exceeded by a basket of prices over a specified number of days, will trigger an administered price cap state.
National Electricity Rules Definition :
The threshold for imposition of an administered price cap as defined in clause 3.14.1.
National Gas Rules Definition :
Means 110% of the Market Price Cap (MPC), being the thrshold for imposition of an administered price cap.