In recent years there has been a major change in the Brazilian electrical matrix, as can be seen when evaluating the last Energy Expansion Plan (PDE 2002) prepared by EPE. There was a large investment in wind and photovoltaic plants, and a reduction in construction and even in the planning of new hydroelectric plants. Associated with this change, it is important to highlight the observation of climate change effects in its hydrographic basins in the last ten years. A long period of drought was noticed, which started in 2012 and lasted until 2019, being an even more serious event than the worst drought ever recorded in Brazilian basins. This fact resulted in the hiring of emergency thermal plants to meet demand in 2022. This hydrological crisis is already a sign that climate change, associated with the intensification of natural cycles of atmospheric blockages (ENSO), can reduce hydraulic generation. And with greater investments in large-scale in the wind and solar plants, it will be necessary to have more thermoelectric generation using fossil fuel to support the intermittence of these renewables, an operation that can be reduced with the implementation of Energy Storage Systems (ESSs). Resources with operational flexibility that can mitigate the increasing variability of the production of renewable sources in electrical matrices will contribute to balancing the load and regulating the frequency. Thus, ESS can reduce the effects of the irregularity of renewable production and help transmission networks to meet demand at peak consumption hours (EPE, 2018), maintain electrical system frequency stability, and optimize the economic performance of generation systems, avoiding activation of less competitive resources such as fossil fuel thermoelectric plants (EPE, 2018). Several countries have already started to invest in pumped storage hydropower (PSH) to enable the intermittent renewable generation and reduce emissions (China and Europe, IDB, 2021).