Optimization of energy storage and system flexibility in the context of the energy transition: Germany’s power grid as a case study

Table 3 Variables (endogenous) calculated by the model

Variables (endog.)	Description	Units
storageCurrent_t,s	Total stored electricity	GWh
storageCapacity_s	Installed storage capacity	GWh
storeIn_t,s	Flow of electricity from the grid into storage units	GW
storeOut_t,s	Flow of electricity out of storage units to the grid	GW
pumpedHydro_t	Hourly dispatch of pumped hydro generation	GW
gas_t	Hourly dispatch of electricity from natural gas	GW
importElec_t	Hourly imported electricity	GW
exportElec_t	Hourly exported electricity	GW

ISSN: 2524-4469