With centralized electrical generation, you get massive economies of scale. It would be very costly to duplicate generation when you can extend lines from a cu

With centralized electrical generation, you get massive economies of scale. It would be very costly to duplicate generation when you can extend lines from a current grid so cheaply. The efficiency of large power plants also results in a reduced carbon footprint. Duplication would be paying much more for a decentralized grids, while producing less electricity from inputs at higher cost.