it will then be included in the decremental part of the database with a decremental bid equal to its incremental price bid.  In the event that the ISO subsequently needs to decrement output, it will initially decrement the Generating Units, Loads, System Units or System Resources incremented previously, and then continue down the merit order of the decremental bids.
2.5.22.7	  Inter-Zonal Congestion.  In the event of Inter-Zonal Congestion in real time, the ISO shall procure Imbalance Energy separately for each Zone, as described in Section 2.5.22.6.
2.5.22.8	  Intra-Zonal Congestion.  Except as provided in Section 5.2, in the event of Intra-Zonal Congestion in real time, the ISO shall adjust resources in accordance with Section 7.2.6.2.
2.5.22.9	  Replacement of Operating Reserve.  If pre-arranged Operating Reserve is used to meet Imbalance Energy requirements, such Operating Reserve may be replaced by the ISO’s dispatch of additional Imbalance Energy through available Supplemental Energy Bids.
Any additional Operating Reserve needs may also be met in the same way.  Where the ISO elects to rely upon Supplemental Energy Bids, the ISO shall select the resources with the lowest incremental Energy price bids.  Operating Reserve procured from Replacement Reserve shall not require replacement of utilized Replacement Reserve.