This chapter describes some of the recent research into the capacity value of wind power. It builds on previous reviews from IEEE and International Energy Agency (IEA) Wind Task 25, and examines recent work that evaluates the impact of multiple-year data sets and the impact of interconnected systems on resource adequacy. The chapter provides examples that explore the use of alternative reliability metrics for wind capacity value calculations. It shows how multiple-year data sets significantly increase the robustness of results compared to single-year assessments. The preferred method for assessing the capacity value of wind and solar generation is a probabilistic approach grounded in the well-known loss of load probability (LOLP) and related reliability metrics. While reliability-based methods are widely accepted and provide accurate measures of wind and solar capacity values, they require detailed system data and can be computationally expensive to evaluate.