  The energy transition has recently experienced a further acceleration. In
order to make the integration of renewable energies as cost-effective, secure
and sustainable as possible and to develop new paradigms for the energy system,
many energy system models have been developed in research in the past to
evaluate the solutions. While model identification and dissemination of results
are widely discussed in the literature, a detailed view of the methodology is
often missing. This paper addresses this topic and proposes a methodology to
build a comprehensive, publicly accessible database for modeling a multi-modal
integrated energy system. The focus hereby is dynamic modeling of low- and
medium-voltage grids consisting of prosumers, battery storages, heat pumps and
electric cars. In addition, a district heating network is parameterized to
match the electricity grid. Modelica and the TransiEnt-Library serves as the
modeling tool. The methodology for creating the grid models is available via
GitLab. A study case that uses the methodology to analyze the congestion
situation within a medium-voltage distribution grid is presented.
