Trading period  Zone  Constraint name  Type  Limit (MW)  Shadow price ($/MWh)  

27  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  329.000  64.11  


28  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  329.000  68.97  


30  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  329.000  63.41  


31  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  329.000  73.07  


43  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  335.000  175.37  

Trading period start  Trading period  Zone  Constraint name  Type  Factor  Component  MW  Limit (MW)  Shadow price ($/MWh) 

07/03/2021 13:00:00  27  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  1.00000  HLY2201 HLY5 [ENOF]  329.00000  329.0000000000  64.1143000000 
07/03/2021 13:30:00  28  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  1.00000  HLY2201 HLY5 [ENOF]  329.00000  329.0000000000  68.9700000000 
07/03/2021 14:30:00  30  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  1.00000  HLY2201 HLY5 [ENOF]  329.00000  329.0000000000  63.4051000000 
07/03/2021 15:00:00  31  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  1.00000  HLY2201 HLY5 [ENOF]  329.00000  329.0000000000  73.0717000000 
07/03/2021 21:00:00  43  CNI  FK_HLY2201 HLY5_CTRLMAX  MnCnst  1.00000  HLY2201 HLY5 [ENOF]  335.00000  335.0000000000  175.3671000000 
Link to this view:
Link to this view:
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:
Only the instances of the above constraints that are binding in the SPD solution for final pricing are presented in this report. A constraint is determined to be binding if its associated shadow price is positive. On any given day, there may well be no binding constraints of any or all of the three constraint types. Binding branch limits are quite rare.
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 righthand 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 lefthand side) can be viewed by clicking on the plus sign at the left to expand the row:
The sum (over all components) of the factor multiplied by the MW for each component will equal the limit or righthand side parameter for a constraint that is binding.
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).
Visit the glossary for a list of defined terms used on the website.
Visit the forum to see if the information you are looking for is already available or ask a question to see if some of our informed users or staff can help?
Clicking the blue discussion tags below the notes will take you directly to discussions on that topic.