Evaluation of the capacity credit of RES: The Greek case

This paper addresses the evaluation of the capacity credit of RES plants in the Greek power system. Five different RES technologies are considered, namely wind, PV, small hydro, biomass, and cogeneration. The methodology adopted uses widely accepted power system reliability indices, such as the loss of load probability (LOLP) and the loss of load expectation (LOLE), computed using the capacity outage probability table (COPT). A three-step procedure for the calculation of the capacity credit for all RES technologies using the effective load carrying capability (ELCC) metric is implemented. Using real historic operational data of the Greek power system, the capacity credit of all RES technologies for the year 2011 are derived. Sensitivity results regarding the effect of the initial installed capacity and the new entrant capacity on the capacity credit are also presented.