This paper presents a tool developed to support the design of solutions to the problem of reactive power in industrial installations.From power data taken from the electrical installation (Watts [W], Volt-Ampere [VA], Volt-Ampere reactive [VAr] and Power Factor [PF]), the tool draws and analyses the historical behaviour, and proposes a power factor correction solution.The tool also calculates the minimum, average and maximum reactive power required by the system.With this limit data the software analyses the power factor correction behaviour and specifies the reactive power for a 6step mixed compensation bank (power per step, including the fixed step).The performance of the tool is evaluated on a data set recorded with a power analyser in a real industrial plant.