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||01 Dec 2021|
|2019||08 Oct 2021|
|2009-2021||05 Apr 2021|
Datasets are collections of files that often contain large volumes of data and are available for immediate download. Dataset users are typically analysts familiar with the electricity industry and have a need to obtain a large set of data or specific data on a regular basis.
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?
Alternative methods are supported to connect to EMI datasets. These methods better facilitate downloading many files or automating regular downloads. See here for more information.