There is also a parallel technology that does a better job of understanding line conditions with regards to heat, humidity, etc. and enables higher utilization as well (versus having to rate the lines to the worst 20 year scenario).
Among risks that are managed is ground faults caused by sage (as the line heats, it expands, getting closer to the ground), or 2) annealing which is a permanent expansion of the conductor due to operating too hot for too long. The advanced conductors use composite cores allowing the conductor to carry more current at a higher temperature with reduced risk for annealing.