Binding and near-binding constraints are extracted from final pricing SPD case files and published here daily. The records with a non-zero shadow price, i.e. the column called MarginalDollarsPerMegawatt, are the binding constraints. Records with a zero shadow price are the near-binding constraints, specifically those constraints where the left-hand side evaluates to be within 5% or 5MW of the right-hand side.
The left-hand side of a constraint can be comprised of multiple components, each shown in a separate row of the file. Each component of a constraint is given a name - see the column called ComponentName - and the set of components belonging to a single constraint can be observed by identifying all rows with a unique ConstraintName-ConstraintType-TradingDate-TradingPeriod-ComponentType tuple. The left-hand side of a constraint can be evaluated by summing the product of ComponentCoefficient and ComponentMegawatts for each component and will yield the value given by LeftHandSideMegawatts.
The P, I, and F suffix in the file name denotes whether the SPD case file is associated with provisional, interim, or final prices, respectively. Once final prices are published and the F suffix is appended to the file name, all other constraint files for that day will be removed.
|Name||Date modified||File size|
|2021||27 Jul 2021|
|2009-2021||05 Apr 2021|
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