Just Energy Transition Partnerships (JETPs) are a form of international cooperation, in which a group of donors provides financial resources against an explicit target on a key indicator of the energy system by the recipient developing country. Four such deals have been signed since COP26 (South Africa, Indonesia, Vietnam and Senegal). This approach has come across as the most striking recent innovation in international discussions to support climate ambition and implementation. After two years and taking advantage of the variety of the four country contexts, lessons from these JETP experiences can help inform future deals. This diagnosis can also provide lessons for innovative approaches to international cooperation, which are critically needed as an outcome of the Global Stocktake under discussion at COP28. Consistently with results from the Deep Decarbonization Pathways initiative and regional perspectives in Latin American and the Caribbean and in Africa, we notably find that international cooperation works better if it adopts a needs-based, sector-driven, solutions-oriented and forward-looking approach.