​​​​​Small- and medium-size wind turbines generally have a higher levelized cost of energy compared to large-scale turbines. The U.S. Department of Energy's Competitiveness Improvement Project (CIP) aims to increase the cost-competitiveness of these turbines by optimizing their design and performance. This advisory reviews this topic and how the CIP has resulted in improvements in design, performance, and certification to increase energy production and cost reduction in some small size wind turbines.