|
| This is an informative document and does not replace the regulation issued by the CREG. |
|
|
| Firm Energy for the Reliability Charge
Hydraulic Plants |
 |
The ENFICC of hydraulic plants is calculated using a computational model (available in the Web Page of the CREG), which maximizes the minimum energy that a hydraulic generation plant can produce monthly during dry periods. This model incorporates the following technical parameters:
 |
Historical statistics of average monthly water inflows; |
|
Interaction of the generation plant with the water sources, discharges and restrictions in the water conduction systems; |
|
Characteristics of the generation plants: average efficiency of the plants, minimum and maximum generation; |
|
Water reservoir: i) minimum technical water level, ii) maximum technical water level and iii) other uses of water like aqueduct or irrigation and environmental restrictions; |
|
Index of Historical Unavailability due to Forced Outages of the Plants (Índice de indisponibilidad histórica por salidas forzadas de la planta or IHF, its acronym in spanish); |
|
Flow constraints. |
The minimum ENFICC that a generator or investor can declare is denominated as ENFICC Base and corresponds to the minimum energy obtained from the maximization model. The maximum ENFICC that can be declared to participate in the auction corresponds to the ENFICC with 95% PSS15, which means, it is the level of energy that the hydraulic generation plants can produce with a 95% level of confidence. If the generator or investor chooses to declare an ENFICC higher than the ENFICC Base to participate in the auction, without exceeding the ENFICC with 95% PSS, the generator should back this difference with a guarantee.
Index of Historical Unavailability due to Forced Outages – IHF
To integrate in the calculation of the ENFICC the availability of generation plants and units both from thermal and hydraulic resources, the CREG defined the IHF, which considers the observed unavailability of each generation asset without including those events that are not under the control of the generator, such as:
|
Failures in the National Transmission System or in the Regional Transmission System; |
|
Rationing of Natural Gas declared by the Ministry of Mines and Energy. |
If the generator is interested in increasing its ENFICC through the improvement of this index, the generator can inform the CREG within the timetable specified by the CREG. The generator should submit the project schedule that supports the announced improvement and a guarantee that backs-up the energy difference due to the change in the index.
In the case of new plants, which do not have yet enough historical information for the calculation of this index, the CREG has established certain values applicable to the first two years of plant operation.
|
|
|
