A CEM campaign was launched at CEM15 on October 1 in Brazil to initiate a series of dialogues with energy regulators and policymakers aimed at exploring effective regulations and regulatory processes. This campaign is supported by partners including the ‘Regulatory Energy Transition Accelerator (RETA)’, ‘Regulatory Assistance Project (RAP)‘, ‘International Energy Agency (IEA)‘, ‘21st Century Power Partnership (21CPP)’ and the ‘Clean Energy Solutions Centre (CESC)‘. Throughout the campaign, multilateral technical workshops, regional virtual webinars, and bilateral consultations were conducted. After the event, guiding documents were provided to governments and regulators to assist in their work. We hope this campaign serves as a cornerstone for bringing experts together and accelerating decarbonization with a regulatory focus.