A computer program product is provided for power delivery analysis and design for a hierarchical system. The product includes a storage medium, readable by a processing circuit, for storing instructions for execution by the processing circuit for facilitating a method. The method includes building a model corresponding to each element of the hierarchical system, and compiling a repository that contains models corresponding to each element, where the repository includes a net list, a domain list, a component list, a pin list, and a layer list. The method also includes performing optimized gridding for each element, the net list, the domain list, the component list, the pin list, and the layer list; assembling a system model from the models contained in the repository; flattening the system model by converting the system model to a flattened system model that consists entirely of resistors; and running a simulation on the flattened system model.