Abstract: Because most distributed photovoltaic generation systems are installed behind-the-meter (BTM) and only measure net load, power system operators cannot obtain photovoltaic generation and load information, resulting in difficulties in distribution system planning and scheduling. With the rapid increase of distributed photovoltaic generation systems, research on BTM photovoltaic generation identification methods is becoming increasingly crucial for power system planning and scheduling. This paper reviews the research results on BTM photovoltaic generation identification methods. Firstly, it introduces the research status of the three main directions of BTM photovoltaic generation identification methods: existence detection, capacity estimation, and output power identification of BTM photovoltaic generation systems. Then, it discusses applying BTM photovoltaic generation identification methods from four aspects: photovoltaic generation system output forecasting, netload forecasting, demand response baseline load estimation, and service restoration plan. Finally, the future development directions are discussed.