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In the hours prior to the delivery, a system operator might need to deploy additional [[supplemental reserve]]s or even commit more generation units, primarily to ensure the reliability of the supply while still trying to minimize the costs. At the same time, operator must ensure that enough [[reactive power reserve]]s are available to prevent the [[voltage collapse]].{{sfn|Conejo|Baringo|2017|p=10}}
=== Dispatch curve ===
{{Graph:Lines
| table=System lambda curve 1.tab
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