In 2010, NERC required that all transmission owners and generator owners of bulk electric system facilities review their facility ratings to determine if their methodology produces appropriate ratings when considering actual field conditions. Although the final deadline for reporting the results of this assessment to NERC was in 2013, remediation to mitigate deviations in ratings due to changes in field conditions is still underway.
Sargent & Lundy has assisted numerous clients with line rating assessments and remediation programs. Using Lidar survey data, we have modeled existing transmission lines and identified clearance infractions. In collaboration with the transmission owners, we have developed plans to mitigate the issues and bring the facilities into compliance with the stated capacity ratings.