10.5 Summary 153 The study showed incremental capacity value falling (approaching zero) as the amount of wind generation on the system increased. Capacity values were calculated based on power system peak demand of 5000 and 6500 MW. At 500 MW of wind capacity, the 5000-MW system resulted in a wind capacity value of 34% of installed capacity. With 1500 MW of wind, capacity value decreased to 23% of installed capacity. For the 6500-MW system wind capacity values were found to be 22%. Adding 3500 MW to the 6500-MW system resulted in a capacity value of 14% installed wind nameplate capacity. Both the Minnesota and New York studies cited above developed incremental ELCC values specific to historical wind conditions. For planners seeking to include some specific capacity value in their studies this may not be satisfactory. Just as conventional resources are not evaluated based on performance in specific historical years, associating capacity value of wind projects with specific historical years provides little insight. Equation (10.1) suggests that year-to-year variability is a contributor to overall capacity value and should be included. Practical diffi- culties with sampling more than a few historical years has probably led to focusing on year-specific ELCC values. Improvements in analytical techniques may improve