I think it means on average they can transmit 30% more current since they know the temperature of the lines for a given load, ambient temp, and air speed. It d

I think it means on average they can transmit 30% more current since they know the temperature of the lines for a given load, ambient temp, and air speed. It doesn’t help on a hot day with no wind. The transmission systems I have seen mimic geography - mostly transmitting power from generators to loads such as big cities. It is more of a radial or hub and spoke architecture than a matrix or grid.