|Trading period||Zone||Constraint name||Type||Limit (MW)||Shadow price ($/MWh)|
|Trading period start||Trading period||Zone||Constraint name||Type||Factor||Component||MW||Limit (MW)||Shadow price ($/MWh)|
Binding transmission and market node constraints in the SPD solution for final pricing are described in this report. The technical parameters for each constraint are presented.
Constraints in the SPD model fall into one of three categories:
Limit (MW) denotes the megawatt value of the transfer capacity parameter for branch constraints and branch limits, and the generating machine limit net of the frequency keeping requirement in the case of market node constraints (i.e. the right-hand side of the constraint).
Shadow price ($/MWh) is a measure of the cost to the system of a binding constraint. Conversely, a constraint that is not binding will have a zero shadow price and imposes no cost on the system. More technically, the shadow price represents the decrease (increase) in the SPD objective function value that would be associated with a 1 MW increase (decrease) in the limit of the constraint. Shading is set between zero (white), $100 (yellow), and $200 (red) on the shadow price as a visual cue indicating the severity of boundedness. Historically, approximately 80% of all binding constraints have a shadow price of less than $200/MWh.
The components that the constraint is composed of (i.e. the left-hand side) can be viewed by clicking on the plus sign at the left to expand the row:
If a branch or branch limit constraint spans two zones, the constraint will appear in the report twice; once for each zone.
Downloading the report as a CSV or PDF does not capture the components of the constraints. To obtain all details of binding constraints, including its components, and to select binding constraints for more than a single day, please use the underlying data report (icon at upper right of screen).
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