Is the electrical grid a centralized, decentralized, or distributed network?
Each dot represents a generating station, consumer, or relay of electricity:

Which type is the most efficient (has the least losses, electrical/heat dissipation)? System "losses are typically between 7% and 12% of the power delivered to consumers" (Casazza & Delea, Understanding Electric Power Systems p. 49). Couldn't it be more efficient than this?
Wouldn't it be more efficient for each consumer of electricity to have his own, smaller generator, rather than large centralized generators with more loss in transmission?