ATC Methodology Transmission Services has developed methodologies for calculating its Available Transfer Capability (ATC) for both long-term and short-term transmission service. This methodology does not currently use Capacity Benefit Margins (CBM) in the calculation of ATC and ATC is not decremented by CBM for either normal or emergency conditions.

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ATC Methodology Documents ATC Methodology, V5 (57k PDF) 2/27/2009 ATC Methodology Margin (AMM)/De Minimis, V10 (40k PDF) 12/29/2009 Post-2011 Base Case Planning Study De Minimis Dead-Band Values (30k PDF) 9/25/2009 Flowgates, Version 2 (95k PDF) 4/13/2009 Contract Accounting Methodology, V5 (83k PDF) 2/27/2009 ATC Impacts of Long-Term Firm Requests, V7 (66k PDF) 5/26/2010 TTC for Network Flowgates, V4 (36k PDF) 2/27/2009 Power Flow Base Case, V5 (52k PDF) 2/27/2009 OASIS ATC Notes (33k PDF) 8/28/07 Short-Term Firm ATC Short-Term Firm ATC Methodology, V5 (214k PDF) 4/13/2009 ATC AMM Postings (157k PDF) 6/8/2007