Ambient-Adjusted Ratings and Dynamic Line Ratings
This report compares Ambient Adjusted Ratings (AAR) with Dynamic Line Ratings (DLR) both from a regulatory and technical standpoint. AARs, now required under FERC Order 881 as a baseline operational practice, adjusts line ratings primarily for ambient temperature and can unlock meaningful capacity relative to static or seasonal ratings, often in the range of 5% to 15%. DLR can provide larger gains—often 10% to 40% or more—because it captures wind cooling and other localized conditions. In some cases, DLR can measure conductor temperature, sag, tension, or clearance. As a result, DLR provides a more accurate line rating together with better situational awareness. This report includes real-world examples demonstrating the differences between the technologies and how DLR can better reduce congestion, lower costs, and improve operational awareness by giving grid operators better visibility into system conditions.
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