System operators have less visibility of the real-time performance of DERs compared to conventional power generation resources and must plan their system with consideration of this uncertainty. Uncertainty considerations have always been a part of power systems because generating resources and transmission components can unexpectedly fail at any time and the system demand cannot be predicted with perfect accuracy. Currently, system operators perform a unit commitment, which determines the least-cost solution of what generators need to be online to meet the expected demand. This project will investigate different unit commitment formulations and DER aggregation methods to assess how software enhancements and participation rules can support DER integration.