This book contributes to the scholarly and policy debate about China's ongoing and increasingly ambitious strategies and actions in its pursuit of the green energy transition. Transitioning to a greener and more sustainable economy has become a shared policy priority worldwide in response to existential challenges posed by climate change and environmental degradation. After decades of unprecedented industrialization and economic growth at the expense of the environment, this green energy transition now tops China's development agenda. Indeed, China already has years of experience advancing climate policies and institutional and regulatory mechanisms at home and is already a major player in advocating cooperation on climate actions internationally. At the same time, the development of new electrical power systems and the energy internet in China has been shaped not only by China's overarching economic development goals and plans but also by its international engagements and commitments, with the involvement of a diverse range of stakeholders and driving forces. This book focuses on exploring the Legal challenges encountered in the development of China's new power system and energy internet, and takes the power grid enterprises that are at the core of the energy Internet value chain as the hub to deeply explore the role of key players in China's green energy transformation in the evolution of China's climate policies and actions.