Because of the inherent randomness and variability of renewable energy

their capacity cannot be treated equally to conventional power generation units in power system planning. Experts and scholars in the power industry have proposed the concept of credible capacity for renewable energy. System-friendly renewable energy power stations adopting the ‘renewable energy + energy storage + smart regulation’ mode can enhance their credible capacity. This study proposes a practical method for calculating the credible capacity of system-friendly renewable energy power stations. Firstly

based on manual standards and practical planning

the definition of credible capacity is established. Secondly

by analysing renewable energy characteristics (credible capacity

daily guaranteed electricity) and energy storage characteristics (output characteristics

stored electricity characteristics)

calculation methods and formulas for determining the credible capacity of system-friendly renewable energy power stations are developed. Finally

practical case studies reveal that: energy storage capacity constitutes a limiting factor for improving the credible capacity of system-friendly renewable energy stations. When sufficient energy storage capacity is available

the daily electricity generation from renewable energy sources becomes the determining factor for system-friendly renewable energy stations reaching their credible capacity saturation point.