Why generation costs in IEEE-118 case and some other cases are linearized?

[type-null]

I'm confused which data to use for the IEEE-118 case data, MATPOWER or pglib. The former has quadratic costs while pglib seems have linearized them.

[ccoffrin]

I suppose it depends on what you would like to do. The pglib cases follows a variety of data cleaning and updating procedures, including updating generation cost functions. The motivations for these changes are discussed in PGLib report and the NESTA report. I suggest you have a look at those to better know which dataset you would prefer to use.

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