This research focuses on the analysis, measurement, and evaluation on power quality of power stations in the Provincial Electricity Authority area, Northeast (Region 2), all 10 stations with high breaker performance statistics. The objective is to analyze the power quality of power stations by measuring data from power stations to analyze and assess problems that occur according to EN50160 standard from March 16 to October 28, 2020. The measurement is divided into 2 parts: 1. Analysis from continuous power quality assessment (Trending ), which concluded that there is voltage exceeded the standard in 5 stations and the analysis found that they caused by small number of the overall amount of electricity consumption in the circuit or the power station. Also, there are many capacitors installed in the circuits of power stations. Furthermore, the power station has increased the voltage at the source more for longer distance distribution. 2. Analysis from event power quality assessment of power station which has Vsag/Vswell events most from 10 stations. At Kantharalak power station, there are 274 events, compared to the standard measurement of PQ SEMI -F47 Vsag (voltage drop) of 55 events and ITIC Vsag (voltage drop) of 71 events. From analysis, momentary power outages are caused by malfunctions in the electrical system and these can occur from many factors such as trees problem, natural disasters, etc.