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Centralised energy was built around a simple idea: produce power in large quantities, then move it to where it is needed. For a long time, that made sense. Large power stations created consistency. Transmission networks carried energy across distance. The system was designed to serve many different places from a smaller number of controlled sources. Its strength was scale. But scale also creates distance. The further energy moves from where it is produced to where it is used, the more the system has to manage in between. It has to forecast demand, absorb peaks, balance supply, build redundancy, and maintain enough capacity for moments that may only happen briefly. That is the trade-off of centralisation. It gives us reach, but it also forces the system to treat very different environments as part of the same broad demand problem. A station, an airport, a hospital, a school, a residential street, and a shopping district do not use energy in the same way. They have different peaks, different patterns, different pressures, and different margins for failure. But under a centralised model, much of that difference is flattened into averages, forecasts, and capacity planning. That is where decentralisation starts to matter. Not as a rejection of central energy systems, but as a way of bringing energy closer to the environments that use it.