An intelligent electrical power distribution system for distributing power on a vehicle the electrical power distribution system comprising: a plurality of power sources including at least a first power source and a second power source for supplying electrical power; a plurality of power blocks including at least a first power block and a second power block, each connected to at least the first power source and the second power source, each power block comprising: at least one load classified as "noisy" or "clean" based at least in part on expected or monitored variance of energy consumption of the at least one load; and a power selector having a plurality of inputs including at least a first input for selectively receiving the electrical power from the first power source and a second input for selectively receiving the electrical power from the second power source, and at least one output for supplying the selectively received electrical power to the at least one load, wherein the power selector selects one of the plurality of power sources based on the classification of the at least one load, wherein the expected or monitored variance of energy consumption of the at least one load is determined based on variance of electromagnetic interference properties. a plurality of power sources including at least a first power source and a second power source for supplying electrical power; a plurality of power blocks including at least a first power block and a second power block, each connected to at least the first power source and the second power source, each power block comprising: at least one load classified as "noisy" or "clean" based at least in part on expected or monitored variance of energy consumption of the at least one load; and a power selector having a plurality of inputs including at least a first input for selectively receiving the electrical power from the first power source and a second input for selectively receiving the electrical power from the second power source, and at least one output for supplying the selectively received electrical power to the at least one load, wherein the power selector selects one of the plurality of power sources based on the classification of the at least one load, wherein the expected or monitored variance of energy consumption of the at least one load is determined based on variance of electromagnetic interference properties. at least one load classified as "noisy" or "clean" based at least in part on expected or monitored variance of energy consumption of the at least one load; and a power selector having a plurality of inputs including at least a first input for selectively receiving the electrical power from the first power source and a second input for selectively receiving the electrical power from the second power source, and at least one output for supplying the selectively received electrical power to the at least one load, wherein the power selector selects one of the plurality of power sources based on the classification of the at least one load, wherein the expected or monitored variance of energy consumption of the at least one load is determined based on variance of electromagnetic interference properties.