The use of electricity with large capacity sometimes faces various kinds of problems. These problems include the presence of network losses and voltage drops that occur on the channel. Improvement of the electric power factor of PT. INDORAMA SYNTHETICS TBK Power House Spining 2 is expected to improve the quality of electric power. This improvement is also expected to be able to reduce the cost of electricity bills in PT. INDORAMA SYNTHETICS TBK. To be able to carry out the improvement of the quality of electric power, it is necessary to calculate the reactive power compensated in, this power factor to be achieved is 0.95. After carrying out these calculations, the value of the capacitor to be used is determined. By carrying out these stages, it is expected that the installation of bank capacitors can improve the quality of electric power.