Dams for water supply usually represent an untapped hydroelectric potential. It is a small energetic\npotential, in most situations, usually requiring a particular solution to be viable. The use of\npumps as power turbines often represents an alternative that enables the power generation in\nhydraulic structures already in operation, as is the case of dams in water supply systems. This potential\ncan be exploited in conjunction with the implementation of PV modules on the water surface,\ninstalled on floating structures, both operating in a hydro PV hybrid system. The floating\nstructure can also contribute to reducing the evaporation of water and providing a small increase\nin hydroelectric power available. This paper presents a pre-feasibility study for implementation of\na hydroelectric power plant and PV modules on floating structures in the reservoir formed by the\ndam of Val de Serra, in southern Brazil. The dam is operated to provide drinking water to about\n60% of the population of the city of Santa Maria, in the state of Rio Grande do Sul, in southern Brazil.\nThe pre-feasibility study conducted with Homer software, version Legacy, indicated that the\nhydroelectric plant with a capacity of 227 kW can operate together with 60 kW of PV modules. This\ncombination will result (in one of the configurations considered) in an initial cost of USD$ 1715.83\nper kW installed and a cost of energy of USD$ 0.059/kWh.
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