Model formulation
+++++++++++++++++

See Chapter 2 of `Thesis <https://www.researchgate.net/profile/Gauthier-Limpens/publication/352877189_Generating_energy_transition_pathways_application_to_Belgium/links/60dd7713458515d6fbef9700/Generating-energy-transition-pathways-application-to-Belgium.pdf>`_ 


