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903 -- Electricity generation capacities in peak load period

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Description kuvaus
Consepts and definitions
Hydro power: On a dry water year and without the capacity reserved for frequency control and instantaneous disturbances.
Condensing power, Gas turbines and engines:Statistical method was changed at beginning of 1988.
Gas turbines and engines: Until the end of 1998, including system gas turbines. Local disturbance and backup systems are not included in the figures.
Combined Heat and Power: Includes CHP gas turbines in use.
Power system reserves: Gas turbines reserved for maintaining the operation reliability of the electricity system and 90 per cent of the frequency control and instantaneous disturbance reserves reserved from hydro power capacity.
Since year 2010: Electricity generation capacities in peak load period at beginning of year.
The electricity capacity available in peak load period refers to the average net capacity that can be produced nation-wide in extreme cold and bad water situations during one hour.
The calculation method was changed and compilation of statistics was specified in 2003, when the system reserve capacities connected to the maintenance of the electricity
system were deducted from the available capacities and are now presented in a separate column. In addition to the data collected for compilation of statistics,
the actual capacities measured by the operation control system are used in the calculation.
When defining the capacities it is assumed that the power plant, electricity network and heating network operate normally, the required fuels are available and the
preparation time needed for raising the capacity is sufficient. The external conditions are assumed to correspond to the situation of a cold winter day when the
temperature outside is around -25ºC. Net capacity is obtained by deducting from the gross capacity of the power plant the capacity of its internal consumption equipment
(in combined heat and power production at most 5 per cent).
Combined heat and power capacity of district heating refers to the electrical capacity available by normal district heating load without auxiliary condensation
and transfer of district heating load to heating boilers. Power and heating plants connected to the same district heating network are assumed to be used similarly
as with the normal production mode. During an extreme cold period electricity generation of district heating plants is lower than normal due to the high heating demand.
Combined heat and power production in industry refers to the electrical capacity derived by assuming that the thermal stress of the power plant corresponds to normal
circumstances. In combined processes the gas turbine capacity is divided into back-pressure power and condensing power in the same ratio as in the connected steam process.
With the gas turbine the bypass option of the heat recovery boiler is not taken into account.
Condensing power in separate electricity generation is defined in a situation where it is assumed that the cooling water of condensers corresponds to circumstances
during a cold winter season and that the possible auxiliary condenser is in use. In combined production plants, condensing power refers to the power derived without
the change in district heating or steam load with an auxiliary condenser or the like.
The nuclear power capacity refers to the maximum power attained in winter when the sea is covered with ice. Hydro power is the power the power plant can produce by
hourly control in a dry water year and without the capacity reserved for frequency control and instantaneous disturbances. Extreme cold conditions in turn reduce the flow
rate of water. Generation of wind power is not included in the calculation. Local disturbance and reserve systems are neither contained in the figures.
System reserves refer to the gas turbines reserved for maintaining the operation reliability of the electricity system and the frequency control and instantaneous.
disturbance reserves, of which 90 per cent are reserved from hydro power capacity.