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

13  LSI  CYD_ROX2.1  BrLimit  80.000  230.17  


15  LSI  CYD_ROX2.1  BrLimit  80.000  376.56  


16  LSI  CYD_ROX2.1  BrLimit  80.000  292.32  


31  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  178.590  65.43  


45  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  178.470  94.01  


46  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  178.550  70.43  


47  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  177.680  56.50  


48  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  178.220  102.20  

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

18/05/2021 06:00:00  13  LSI  CYD_ROX2.1  BrLimit  1.00000  CYD_ROX2.1  80.00000  80.0000000000  230.1700000000 
18/05/2021 07:00:00  15  LSI  CYD_ROX2.1  BrLimit  1.00000  CYD_ROX2.1  80.00000  80.0000000000  376.5600000000 
18/05/2021 07:30:00  16  LSI  CYD_ROX2.1  BrLimit  1.00000  CYD_ROX2.1  80.00000  80.0000000000  292.3200000000 
18/05/2021 15:00:00  31  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  1.13600  HWA_SFD1.1  94.04700  178.5900000000  65.4319000000 
18/05/2021 15:00:00  31  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  0.94900  WGN_WVY1.1  75.60900  178.5900000000  65.4319000000 
18/05/2021 22:00:00  45  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  1.11600  HWA_SFD1.1  85.41000  178.4700000000  94.0121000000 
18/05/2021 22:00:00  45  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  0.95300  WGN_WVY1.1  87.25400  178.4700000000  94.0121000000 
18/05/2021 22:30:00  46  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  1.11600  HWA_SFD1.1  83.68200  178.5500000000  70.4298000000 
18/05/2021 22:30:00  46  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  0.95300  WGN_WVY1.1  89.36000  178.5500000000  70.4298000000 
18/05/2021 23:00:00  47  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  1.11800  HWA_SFD1.1  83.29200  177.6800000000  56.4995000000 
18/05/2021 23:00:00  47  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  0.95100  WGN_WVY1.1  88.91600  177.6800000000  56.4995000000 
18/05/2021 23:30:00  48  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  1.12100  HWA_SFD1.1  83.55200  178.2200000000  102.2030000000 
18/05/2021 23:30:00  48  LNI  HWA_SFD1.1__WGN_WVY1.1__WGN_WVY1__SFD__LN  BrCnst  0.95100  WGN_WVY1.1  88.91600  178.2200000000  102.2030000000 
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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).
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