{"id":361,"date":"2020-11-18T14:08:00","date_gmt":"2020-11-18T12:08:00","guid":{"rendered":"https:\/\/www.eskom.co.za\/dataportal\/?page_id=361"},"modified":"2023-08-24T08:28:47","modified_gmt":"2023-08-24T06:28:47","slug":"glossary","status":"publish","type":"page","link":"https:\/\/www.eskom.co.za\/dataportal\/glossary\/","title":{"rendered":"Glossary"},"content":{"rendered":"\t\t
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Glossary of terms<\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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AEL<\/span><\/strong><\/span> <\/strong>\u2013 Atmospheric Emission License<\/span><\/span><\/div>\n

Available Dispatchable Capacity (Incl Non-Comm Units)<\/strong><\/span> \u2013 The capacity that is available from all dispatchable generation resources, and includes non-commercial generation, as it is dispatchable energy available to support the system.
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CO2<\/strong><\/span> <\/strong>\u2013 Carbon dioxide <\/span>
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CSP<\/strong><\/span> \u2013 Total contracted Concentrated Solar Power generation.<\/span><\/div>\n
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DEA<\/strong><\/span> \u2013 Department of Environmental Affairs<\/span><\/div>\n

DEFF<\/strong><\/span> \u2013 Department of Environment, Forestry and Fisheries (Ministry)
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Dispatchable IPP OCGT<\/strong><\/span> \u2013 OCGT plant that is owned by an IPP and is dispatched by Eskom National Control.
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EAF<\/strong><\/span> \u2013 Energy Availability Factor of Eskom plant. It is the difference between the maximum availability and all unavailabilities (PCLF, UCLF & OCLF) expressed as a percentage. This excludes renewables, IPPs and international imports.<\/span><\/span>
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ESP<\/strong><\/span> \u2013 Electrostatic Precipitator<\/span><\/span>
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FGD<\/strong><\/span> \u2013 Flue gas desulphurisation<\/span><\/span>
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Financial Year<\/strong><\/span> <\/strong>\u2013 This is Eskom\u2019s financial year, which starts from 01 April until 31 March of the following year. In some instances, data is shown for full weeks. In these cases, the period will start on the closest Monday to 01 Apr, and ends on the closest Sunday to 31 March. 
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Gen Unit Hours<\/strong><\/span> <\/strong>\u2013 The amount of hours that one unit at pump storage stations can generate based on the amount of water still available in the dams or the number of hours that one unit at an OCGT power station can generate based on the fuel available at that power station. 
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GT <\/strong><\/span>\u2013 Gas Turbine. Generation from small gas turbine power stations, and sent-out onto the Transmission network.
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GW<\/strong><\/span> \u2013 Gigawatt = 1 000 megawatts
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GWh<\/strong><\/span> \u2013 Gigawatt-hour = 1 000MWh
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Hydro Generation<\/strong><\/span> \u2013 Generation from large hydro power stations, and sent-out onto the Transmission network.
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ILS<\/strong><\/span> – Interruptible Load Shed. This is consumer load(s) that can be contractually interrupted without notice or reduced by remote control or on instruction from
Eskom National Control. Individual contracts place limitations on usage.
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International Exports<\/strong><\/span> \u2013 Energy that is exported from RSA to neighboring countries.
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International Imports<\/strong> <\/span>\u2013 Energy that is imported into RSA from neighboring countries.
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IOS<\/strong> <\/span>\u2013 Interruption of Supply. It is all contracted as well as mandatory demand reduction resources utilised by Eskom National Control. This includes interruption of supply due to Transmission network faults. 
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IPP<\/strong> <\/span>\u2013 Independent Power Producers that Eskom has contracts with.
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kt <\/strong><\/span>\u2013 Kiloton = 1 000 tons
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kV<\/strong><\/span> \u2013 Kilovolt
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kWh<\/strong><\/span> \u2013 Kilowatt-hour = 1 000 watt-hours
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kWhSO<\/strong><\/span> \u2013 Kilowatt-hour sent out
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LNB<\/strong><\/span> \u2013 Low NOX Burner 
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Load Factor <\/strong><\/span>– The ratio of the energy generated over a specific time versus the maximum generating capability over the same period.
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MES<\/strong><\/span> \u2013 Minimum Emission Standards (published under the National Environmental Management: Air Quality Act (NEM:AQA) (Act No 39 of 2004)
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MLR<\/strong><\/span> \u2013 Manual Load Reduction. It is an estimation of the demand that has been reduced due to load shedding and\/or curtailment.
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Mt<\/strong><\/span> \u2013 Million tons
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MW<\/strong><\/span> \u2013 Megawatt = 1 million watts
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MWh<\/strong><\/span> \u2013 Megawatt-hour = 1 000kWh
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MWhSO<\/strong><\/span> \u2013 Megawatt-hour sent out
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NAAQS<\/strong><\/span> <\/strong>\u2013 National Ambient Air Quality Standards
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NAQO<\/strong><\/span> \u2013 National Air Quality Officer<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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NEMA<\/strong><\/span> \u2013 National Environmental Management Act, 1998 (Act No. 107 of 1998) <\/span><\/span><\/span><\/div>

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NEMAQA<\/strong><\/span> \u2013 National Environment Management: Air Quality Act, 2004 (Act No. 39 of 2004)
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NO<\/strong><\/span> \u2013 Nitrogen oxide
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NO2<\/strong><\/span> \u2013 Nitrogen dioxide 
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Non-Dispatchable Conventional IPP <\/strong><\/span>\u2013 IPP that uses conventional fuel sources to generate energy. These IPPs are contracted with Eskom but not dispatched by Eskom National Control.
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NOX<\/strong><\/span> <\/strong>\u2013 Oxides of nitrogen (NOX = NO + NO2) 
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Nuclear Generation<\/strong><\/span> \u2013 Generation from nuclear power stations, and sent-out onto the Transmission network.<\/span><\/div>\n

OCGT<\/strong><\/span> \u2013 Open Cycle Gas Turbine. Generation from open cycle gas turbine power stations, and sent-out onto the Transmission network. These power stations use diesel as their primary resource.
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OCLF<\/strong><\/span> \u2013 Other Capability Loss Factor of Eskom plant. It is the ratio between the unavailable energy of the units that cannot be dispatched, due to constraints out of the power station management control, over a period compared to the total net installed capacity of all units over the same period.
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Other RE<\/strong><\/span> \u2013 Generation from other smaller contracted renewables (small hydro, biomass, landfill gas, etc.).
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PCLF<\/strong><\/span> \u2013 Planned Capability Loss Factor of Eskom plant. It is the ratio between the unavailable energy of the units that are out on planned maintenance over a period compared to the total net installed capacity of all units over the same period.
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PM<\/strong><\/span> <\/strong>\u2013 Particulate Matter
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PM10<\/strong><\/span> \u2013 Particulate Matter with a diameter of less than 10\u03bc<\/span>m 
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PM2.5<\/strong><\/span> \u2013 Particulate Matter with a diameter of less than 2.5\u03bc<\/span>m 
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Pumped Water Generation<\/strong><\/span> \u2013 Generation from pumped storage power stations, and sent-out onto the Transmission network.
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Pumping<\/strong><\/span> <\/strong>\u2013 During off-peak periods and when the system allows, water is pumped from the bottom dams at pumped storage stations to the top dams so that this water is available to generate with again. During this process, energy is used from the Transmission network.
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PV<\/strong><\/span> \u2013 Total contracted Photovoltaic generation.
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REIPP<\/strong><\/span> – Renewable Energy (RE) Independent Power Producer.
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Residual Demand<\/strong><\/span> <\/strong>\u2013 The hourly average demand that needs to be supplied by all resources that can be dispatched by Eskom National Control. It includes Eskom generation, international imports, dispatchable IPPs and IOS. Normally expressed in MW.
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Residual Energy<\/strong><\/span> \u2013 The total residual demand that is summated over a period of time. Normally expressed in MWh or GWh.
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Residual Forecast<\/strong><\/span> \u2013 The forecast of what the expected residual demand will be in the future.
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RSA Contracted Demand<\/strong><\/span> \u2013 The hourly average demand that needs to be supplied by all resources that Eskom has contracts with. It is the residual demand including demand supplied by self-dispatched generation (such as the renewables).
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RSA Contracted Energy<\/strong><\/span> \u2013 The total RSA contracted demand that is summated over a period of time. Normally expressed in MWh or GWh.
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RSA Contracted Forecast<\/strong><\/span> <\/strong>– The forecast of what the expected RSA contracted demand will be in the future. 
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SCO<\/strong><\/span> \u2013 Synchronous Condenser Operation. The energy used (MW per hour) to overcome the frictional losses when plant is used to assist in stabilizing the network by supplying or absorbing reactive power.
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SO2<\/strong><\/span> <\/strong>\u2013 Sulphur dioxide 
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Thermal Generation<\/strong><\/span> \u2013 Generation from coal fired power stations, and sent-out onto the Transmission network.
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Total Available Capacity (Incl Non-Comm Units and Renewables)<\/strong><\/span> \u2013 The capacity that is available from all generation resources that Eskom has contracts with, and includes non-commercial generation, as it is energy available to support the system.
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UCLF<\/strong><\/span> \u2013 Unplanned Capability Loss Factor of Eskom plant. It is the ratio between the unavailable energy of the units that are out on unplanned outages over a period compared to the total net installed capacity of all units over the same period.
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Wind <\/strong><\/span>\u2013 Total contracted Wind generation.<\/span><\/div>\n

\u03bc<\/strong><\/span>m<\/strong> <\/span>\u2013 1 \u03bc<\/span>m = 10-6 m<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Glossary of terms AEL \u2013 Atmospheric Emission License Available Dispatchable Capacity (Incl Non-Comm Units) \u2013 The capacity that is available from all dispatchable generation resources, and includes non-commercial generation, as it is dispatchable energy available to support the system. CO2 \u2013 Carbon dioxide  CSP \u2013 Total contracted Concentrated Solar Power generation. DEA \u2013 Department of Environmental Affairs DEFF \u2013 Department of…<\/p>\n","protected":false},"author":9,"featured_media":0,"parent":0,"menu_order":10,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"fullwidth","_kad_post_sidebar_id":"","_kad_post_content_style":"unboxed","_kad_post_vertical_padding":"hide","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-361","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.eskom.co.za\/dataportal\/wp-json\/wp\/v2\/pages\/361","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.eskom.co.za\/dataportal\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.eskom.co.za\/dataportal\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.eskom.co.za\/dataportal\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eskom.co.za\/dataportal\/wp-json\/wp\/v2\/comments?post=361"}],"version-history":[{"count":29,"href":"https:\/\/www.eskom.co.za\/dataportal\/wp-json\/wp\/v2\/pages\/361\/revisions"}],"predecessor-version":[{"id":282214,"href":"https:\/\/www.eskom.co.za\/dataportal\/wp-json\/wp\/v2\/pages\/361\/revisions\/282214"}],"wp:attachment":[{"href":"https:\/\/www.eskom.co.za\/dataportal\/wp-json\/wp\/v2\/media?parent=361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}