This paper examines the governance of climate change in Thailand through a critical lens. Governance in Thailand tends to oscillate between direct military rule and more competitive elected governments. A coup in May 2014 resulted in the current military regime, which appears unlikely to surrender power to democratic forces anytime soon. Climate policy, and associated energy policy, has remained largely impervious to changes in government over the last two decades despite very different regimes. Since 2014, however, the military government has focused more attention on fossil fuel development while much of the earlier developments in renewable energy markets has unraveled. This is occurring just at the time when renewable energy technologies are maturing globally and as Thailand demonstrates its susceptibility to flooding and droughts as a result of climate change. Thai environmental activists have often been at the forefront in the region when it comes to climate and energy activism but since the coup a range of factors has resulted in the dissipation of this activity. Adopting a political ecology approach, this paper analyses the role of environmental activists in the governance of climate change and energy in Thailand and assesses the risks and likely outcomes of developments in the future.