[Figure2] (IMAGE) National Research Council of Science & Technology Caption The negative polarity (-) lightning strikes the conventional air-termination (lightning rod), but the positive polarity (+) lightning, which occurs more frequently in winter, avoids it and strikes the relatively negatively charged side of the wind turbine blade. Credit Korea Electrotechnology Research Institute(KERI) Usage Restrictions The sources of photos and research results from KERI must be specified. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.