The energy efficiency of conventional thermal electricity production (which includes both public plants and autoproducers) is defined as the ratio of transformation outputs from conventional thermal power stations (electricity and heat) to transformation inputs to conventional thermal power stations. It is expressed as a percentage. The output from conventional thermal power stations consists of gross electricity generation, as well as any heat sold to third parties (combined heat and power plants) by conventional thermal public power stations (public or main activity), district heating, and autoproducer thermal power stations.
Gross electricity generation is measured at the outlet of the main transformers, i.e. the consumption of electricity in the plant auxiliaries and in transformers is included. Public supply is defined as undertakings that generate electricity (and heat) for sale to third parties as their primary activity. They may be privately or publicly owned. Autoproducers are defined as undertakings that generate electricity, either wholly or partly for their own use, as an activity that supports their primary activity (e.g. industrial processes).
Fuel inputs include solid fuels (i.e. coal, lignite and equivalents), oil and other liquid hydrocarbons, gas, thermal renewables (industrial and municipal waste, wood waste, biogas and geothermal energy) and other non-renewable waste.
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