The **energyRt** model comprises around one hundred
predefined equations to describe an energy technologies, energy system
and its operation. Additional equations can be added using
*newConstraint* methods or added to the model code directly. The
model is formulated in four alternative math-programming languages: GAMS,
Python/Pyomo,
GLPK/Mathprog,
and Julia/JuMP.
Mathematical formulation of **energyRt** can be found here.