8 Expanded All Generators residing NW1, NW2, SR5, SR2, Active North of Path 15 North of Path 15 SMUD, TID, Sutter 9 North of Path 26 All Generators residing None Active North of Path 26 10 Expanded All Generators residing NW1, NW2, SR5, SR2, Active North of Path 26 North of Path 26 SMUD, TID, Sutter All AS Regions shown in Exhibit 4-1 are However, this does not necessarily mean that “active”. a minimum (or maximum) procurement limit is enforced for each of these AS Sub-Regions for a given hour. The indicates that the AS Sub-Region is defined in the CAISO term “active” here Tariff, and is included in the daily determination of applicable Regional AS limits. However, an AS Sub-Region may be but also have a zero MW minimum procurement limit and a “active” 9,999 MW maximum procurement limit, which effectively renders the AS Sub-Region as unconstrained. AS requirements, procurement, and pricing are expressed by AS Region. The minimum and/or maximum procurement constraints are each determined individually and serve as separate constraints on the procurement of resources. A purchase of AS capacity in a specific Location on the grid may contribute to meet the requirements of several AS Regions simultaneously. As conditions evolve, the CAISO may need to establish additional AS Regions to manage AS procurement limits for sub-AS Regions. These conditions may include: A pocket of Generation or Load for which more localized limits are needed to ensure sufficient capacity procurement under certain system conditions A System Resource at a Scheduling Point from which CAISO foresees a need to limit the AS procurement, under certain system conditions CAISO follows the AS Region change process described in the next section, as power system conditions warrant.
8 Expanded North of Path 15 All Generators residing North of Path 15 NW1, NW2, SR5, SR2, SMUD, TID, Sutter Active 9 North of Path 26 All Generators residing North of Path 26 None Active 10 Expanded North of Path 26 All Generators residing North of Path 26 NW1, NW2, SR5, SR2, SMUD, TID, Sutter Active All AS Regions shown in Exhibit 4-1 are “active”. However, this does not necessarily mean that a minimum (or maximum) procurement limit is enforced for each of these AS Sub-Regions for a given hour. The term “active” here indicates that the AS Sub-Region is defined in the CAISO Tariff, and is included in the daily determination of applicable Regional AS limits. However, an AS Sub-Region may be “active” but also have a zero MW minimum procurement limit and a 9,999 MW maximum procurement limit, which effectively renders the AS Sub-Region as unconstrained. AS requirements, procurement, and pricing are expressed by AS Region. The minimum and/or maximum procurement constraints are each determined individually and serve as separate constraints on the procurement of resources. A purchase of AS capacity in a specific Location on the grid may contribute to meet the requirements of several AS Regions simultaneously. As conditions evolve, the CAISO may need to establish additional AS Regions to manage AS procurement limits for sub-AS Regions. These conditions may include: A pocket of Generation or Load for which more localized limits are needed to ensure sufficient capacity procurement under certain system conditions A System Resource at a Scheduling Point from which CAISO foresees a need to limit the AS procurement, under certain system conditions CAISO follows the AS Region change process described in the next section, as power system conditions warrant.