The demand for drinking water of the city of Oviedo is satisfied in normal conditions with the contribution of the springs of the Aramo Mountains (Namurian limestones), whose surplus is regulated in the Los Alfilorios Reservoir, and water from the Asturian Consortium for water supply and sanitation (CADASA), coming from another council (Sobrescobio). In times of shortage (summer months) it is necessary to pump water from the Quaternary connected to the Nalón River (the main river in the region) between the reservoir and the city. The annual flow needed to supply Oviedo (220,000 inhabitants) distributes approximately in: 63% from the Aramo springs, 17% from the Alfilorios reservoir, 5% from the Nalón River and the rest is bought from CADASA. With the exception of the latter, the remaining waters are treated in the Cabornio Drinking Water Treatment Station (DWTS), located near the reservoir, before being supplied to Oviedo. This work presents the possibility of installing a multiple system of renewable hydroelectric use: i) between the Aramo springs and the Cabornio DWTS; ii) between this DWTS and the supply tanks of Oviedo, in both cases taking advantage of the difference in elevation, by means of turbogenerators; iii) between the Los Alfilorios reservoir and the Nalón River, by means of a pumped-storage hydroelectricity system which turbines during periods of high electrical demand (using turbogenerators) and pumps in off-peak hours. This design would allow to increase the flow extracted from the river when necessary, reducing dependence on external water. The proposed systems are economically viable and interesting from the financial point of view, obtaining positive values of VAN, IRR between 7 and 20% and amortization periods between 5 and 12 years. This resource could be used for sale or self-consumption, and its use should be enhanced, especially in an energy-dependent country. Additionally, the use of renewable energies has environmental advantages, such as saving CO2 emissions. These systems are framed within the concept of "sustainable city”, and can be extrapolated to the water supply hydraulic infrastructures operating in other cities.