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This policy brief by Energy Innovation examines how the transition to clean energy challenges traditional 'resource adequacy' planning—the process of ensuring grid operators have sufficient resources to balance supply and demand. The author argues that historical planning paradigms, which rely on dispatchable fossil fuel plants and simple peak-demand metrics, are becoming inadequate as variable renewable energy (VRE) and distributed energy resources (DERs) increase. The document warns that fossil fuel incumbents are leveraging these reliability concerns to protect their market share and slow decarbonization, urging climate advocates to promote more granular, flexible, and holistic planning models.