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This article explores the challenges posed by the doctrine of legitimate expectations under international investment law in the context of the renewable energy transition in Asia. As regulatory frameworks evolve from incentivising to normalising renewable energy, the likelihood of investment disputes becomes increasingly acute. Drawing lessons from the “Spanish renewables saga”, the present contribution reveals the particular contours of legitimate expectations through the many and varied renewable energy cases in which this doctrine has arisen. While the case law in this area is often inconsistent,