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Francato A.L.,University of Campinas | Barbosa P.S.F.,University of Campinas | Lopes J.E.G.,University of Campinas | Zambon R.C.,University of Sao Paulo | And 2 more authors.
World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress | Year: 2011

Given the importance of controlling floods in valleys and their impacts on the operation planning of hydropower plants, this research work aims at developing a contribution for finding a systematic metrics and risk criteria acceptance. It is assumed that each hydropower plant has a maximum flow constraint at downstream valley, thus requiring protection through operational procedures of the spillway and turbines. The decision about which risk level is acceptable for protection against flooding in the corresponding valleys should consider the nature, the complexity for control and the magnitude of the consequences of flooding. In general terms, high impacts will require low acceptable risk levels and, high complexity for flood control operation will require low acceptable risk levels. In order to describe the magnitude of consequences under flooding beyond the threshold level (maximum flow constraint), six severity descriptors were defined based on social impacts, possible fatalities, economic damages, operational damages, environmental damages and reputation losses to the image of the generation company. The severity descriptors are measured by using qualitative scales (low, moderate, high, catastrophic) with detailed instructions about the situations that leads to each position in the several scale levels. Similarly, five complexity operational flood control descriptors are also defined, with the corresponding qualitative scales. The proposed methodology is applied on a system of hydropower plants of the power generation company Companhia Energetica de Sao Paulo (CESP). This case study was developed with the collaboration of the technical staff of CESP, including professionals of different branches of the company. The results exhibits consistency, thus revealing the proposed methodology as an useful tool for supporting decision about risk criteria acceptance. © 2011 ASCE.

Mustafa A.L.,CESP Companhia Energetica de Sao Paulo | Nuti M.R.,CESP Companhia Energetica de Sao Paulo
43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010 | Year: 2010

This paper presents some questions related to the consideration of environmental costs at the operation phase of hydropower plants. An exercise was done based on the expenses of CESP - Companhia Energética de São Paulo in 5 hydropower plants during 2008 showing the portion that can be appropriated as investments and what must be included in the company budget, according to the actual Brazilian electrical sector regulation. The authors suggest some points to be developed in future researches on this subject and with external costs. Also, emphasizes the necessity of detailed items of environmental costs being considered in the official manual of National Agency for Electric Energy.

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