This paper introduces a Structured Transition Model: a lifecycle-oriented approach to data center power that delivers reliable capacity today while preserving the flexibility to hybridize, decarbonize, and integrate with future grid conditions. Importantly, the Structured Transition Model treats speed to power as a sustainability enabler. It allows efficient compute capacity to come online immediately using proven, fuel‑flexible platforms that meet today’s emissions requirements while remaining fully compatible with future decarbonization pathways. Rather than optimizing for a single end state, the model defines key performance characteristics: modularity, fuel flexibility, part-load efficiency, and system interoperability, that enable infrastructure to evolve over time.