This is a very common question, and understanding the distinction is crucial. The main differences are in their function, voltage levels, and scale:

• Function and Voltage: The transmission system is the "highway" of the power grid, moving huge amounts of power at very high voltages (over 69 kV) across vast distances. In contrast, the distribution system is the "local road network," carrying power at lower voltages (under 69 kV) from substations to individual consumers.

• Physical Infrastructure: transmission lines are typically supported by large, steel lattice towers or tubular poles. Distribution lines, which run through neighborhoods, are usually supported by smaller wooden poles.

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