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The introduction of distributed renewable power units (RPU) changes the operation of electrical power systems. RPU take over tasks of conventional power plants such as energy supply and the provision of ancillary services. The ancillary service provision must be reliable in order to guarantee secure system operations. In this thesis, the RelACs-method is introduced to assess coalitions, i.e. aggregations of RPU, with respect of how reliably they are able to provide ancillary services, particularly for the use case of providing primary control reserves. The RelACs-method incorporates uncertainties induced by unit failures and forecast errors as well as dependencies between units. The RelACs-method can be used to guarantee that a coalition is able to fulfil specific reliability requirements. Furthermore, the RelACs-method is used to derive recommendations for the choice of inputs to coalition forming given different conditions.