When top management takes a proactive stance towards environmental initiatives, it not only promotes competencies such as green product design and green manufacturing, but also leads to performance benefits. However, while researchers argue that information systems (IS) can play an important role toward sustainability, what effect, if any, does Green IS have on the relationships between top management commitment, green competencies, and performance is an understudied topic. Accordingly, using the competency-based model of competitive advantage, we propose that Green IS can play a key supporting role in enhancing performance by strengthening the influence of top management commitment (managerial competency) on green product design and green manufacturing (transformation- based competencies). We test a mediated-moderation model using data from 256 Chinese organizations. Implications for practice are also discussed.