Disclosed is a method of managing electricity providing in a computers cluster, including: a process of prediction of need of electricity provided by at least one renewable electricity source in the computers cluster, a process of prediction of availability of the electricity provided by the renewable electricity source, including: a step of managing failure risk of the renewable electricity source, by lowering the predicted availability, so as to: increase life expectancy of the renewable electricity source, and/or lower maintenance frequency of the renewable electricity source, a process of scheduling tasks in the computers cluster, based on both the prediction processes.