"Although general elections in Myanmar (Burma) in November 2010 have transformed the political landscape, many of the characters remain the same. While there is evidence of incremental domestic political openings many of the political constraints that existed during military rule remain in force. As a consequence of decades of military authoritarian governance and civil conflict, it is Myanmar’s contested ethnic borderlands that have been the important locales for the development of environmental movements, despite increased recent domestic activity. This article analyses a case study of the largely cross-border campaign against hydropower dams on the Salween River in Myanmar and finds that through the suppression of opposition and dissent at home the regime has stimulated the creation of an ‘activist diaspora’, a dynamic transnational community of expatriates who engage in environmental activism beyond the reach of the regime. Due to their relative freedom on the border and in Thailand this community has developed expertise and international networks that have proved crucial in communicating the social and environmental impacts of hydropower development in Myanmar to the international community. Through increased cooperation with an expanding domestic civil society this established activist community is stimulating improved environmental governance of hydropower development and simultaneously assisting in the creation of a more open and democratic Myanmar..."