  MTRESS is a tool that facilitates the creation of models of residential
energy supply systems by providing a template with meaningful presets. This
model can then be used to linearly optimise the operation of the energy system.
Version~3.0 enables multiple locations belonging to one energy system to be
defined. Furthermore, it adds hydrogen as an energy carrier with the
possibility to convert power to gas using electrolysis and to store gas at
different pressure levels. Additionally, we reworked the Python API, giving
more flexibility to the user.
