​According to the American Society of Civil Engineers, more than 640,000 circuit miles of transmission line in the U.S. are operating at or above their rated capacities. The consequences of this congestion can include involuntary delays in routine maintenance, reliability challenges, and higher electric costs due to out-of-merit dispatch. This advisory explains how dynamic line ratings (DLRs) can offer a relatively affordable way to upgrade the capacity of existing transmission lines.

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