The paper focuses on the possibilities of generating electrical energy by means of on-grid PV solar systems of 1kW in the Republic of Srpska (Bosnia and Herzegovina). The paper proceeds to tackle with the legislative concerning renewable sources of energy and current state of the use of PV systems in the Republic of Srpska and Bosnia and Herzegovina, climate conditions and energy potential of the renewable sources in the Republic of Srpska. Based on PVGIS program, the results of calculation of the yearly average values of the optimal panel inclination, solar irradiation on the horizontal, vertical and optimally inclined plane, ratio of diffuse to global solar irradiation, linke turbidity, average daytime temperature and 24h average of temperature for 13 cities in the Republic of Srpska are given. Total for year sum of global irradiation per square meter received by the modules of the optimally inclined fixed PV solar plants of 1kW, optimally inclined one-axis and dual-axis tracking PV solar plants of 1kW, and total for year electricity production of different types of PV solar plant of 1kW for 13 cities in the Republic of Srpska, obtained by PVGIS are given. Comparison of the total for year electricity production of different types of PV solar plant of 1kW with monocrystaline silicon, CdTe and CIS solar modules, respective, to 13 cities in the Republic of Srpska are given. Calculations performed by PVGIS program have shown that irrespectable of the type of PV solar plants, most electrical energy in the Republic of Srpska can be generated by means of PV solar plants with CdTe solar cells. Some practical data and considerations given in this paper can be used by a customer or company keen to invest in the PV sector in the Republic of Srpska.