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The levelized cost of electricity (LCOE) is a metric that attempts to compare the costs of different methods of electricity generation consistently. Though LCOE is often presented as the minimum constant price at which electricity must be sold to break even over the lifetime of the project, such a cost analysis requires assumptions about the value of various non-financial costs (environmental ...
The cost of a electricity production depends on costs during the expected lifetime of the generator and the amount of electricity the generator is expected to produce over its lifetime. The levelized cost of electricity (LCOE) is the average cost in currency per energy unit, for example, EUR per kilowatt-hour or AUD per megawatt-hour. [3]
Relatively efficient gas-fired power stations – such as those based on combined cycle gas turbines – emit about 450 grams (16 oz) of CO 2 per kilowatt-hour of electricity generated. [ 12 ] [ 13 ] This is about half that of coal-fired power stations but much more than nuclear power plants and renewable energy . [ 12 ]
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the gas turbine can start in 15-30 minutes; the steam turbine (ST) heating process takes from 1 hour (for hot startup) to 6 hours (for cold startup); ST load increase takes additional 20 minutes (if "hot") to 2 hours ("cold"). Nuclear power plants have the longest startup times of few days for the cold startup (less than a week).
A gas generator is a device for generating gas. A gas generator may create gas by a chemical reaction or from a solid or liquid source, when storing a pressurized gas is undesirable or impractical. The term often refers to a device that uses a rocket propellant to generate large quantities of gas. The gas is typically used to drive a turbine ...
To express the efficiency of a generator or power plant as a percentage, invert the value if dimensionless notation or same unit are used. For example: A heat rate value of 5 gives an efficiency factor of 20%. A heat rate value of 2 kWh/kWh gives an efficiency factor of 50%. A heat rate value of 4 MJ/MJ gives an efficiency factor of 25%.
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