Study-Based Rating Methodology update

ATC’s list of transmission facilities with the implementation of Study-Based Ratings Methodology (SBRM) & transitional ratings starting June 1, 2013:

Table1 includes the list of transmission facilities within ATC footprint that will have transitional ratings starting June 1, 2013.  Additionally, the list includes the mitigation projects that when completed will initiate the change to study based ratings for the transmission facility listed.  Note that the list of transitional ratings and mitigation projects is subjected to change based on further analysis.

Table2 includes the list of transmission facilities within the ATC footprint that are planned to be transitioned to the Study-Based Ratings Methodology starting June 1, 2013.

Table3 includes the list of non-bulk electric system facilities (<100kV) that will continue to operate at the pre Study-Based Ratings Methodology (SBRM) ratings until they are reviewed and the study based ratings methodology is applied.  This transition will occur approximately over the next 5 years.

All expected future ATC Study-Based Ratings and transitional ratings have been submitted to MISO’s Model on Demand (MOD) process.  Also, the mitigation projects to end the transitional ratings pertaining to the identified transmission facilities that were impacted as a result of the Study Based Ratings methodology have been submitted to MISO’s Model on Demand (MOD) and MISO’s Transmission Expansion Planning process (MTEP). 

For additional information or questions on this topic, please contact Jeff Schraufnagel, Manager of Interconnection Services, at jschraufnagel@atcllc.com or at (262) 506-6782.