The reliability performance of systems containing a significant amount of hydro generation is quite different from that of systems including less or no hydro generation. This would bring unique challenges in modeling such systems for reliability studies. Conventional probabilistic resource adequacy analysis does not sufficiently quantify some of the important limitations such as energy limitations associated with hydro generation. In this paper, the results obtained from different evaluation approaches were compared and assessed using a small but representative reliability test system. The paper will further explore a method that includes modeling multiple weather years to capture the variability in rainfall for systems with significant amount of hydro generation as well as capturing the correlation of hydro performance and load. This paper will also discuss solutions to modeling a hydro fleet that contains resources with a range of flexibility from run of river to significant energy storage. The paper concludes by providing a solution to quantifying the reliability and economic impact of all of these uncertainties and ways to improve upon conventional techniques.
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