The global implementation of renewable energy technologies requires sustainable large-scale manufacturing by using locally available materials. The urgent need to achieve a climate-neutral society encouraged researchers to find sustainable and innovative ways to store electrical energy. Currently, Li-ion battery (LIB) technology is the largest implemented commercial level battery for energy systems. The LIBs' upstream supply chain comprises specific materials, including lithium, cobalt, iron, and phosphate. The latter poses a challenge as they are geographically limited to fewer countries. Therefore, as the LIB production growth rate increases rapidly, balancing the raw material supply and resource circulation is required.In contrast to the intercalation-based electrochemistry of the LIBs, the redox flow battery (RFB) store electrical energy in the form of chemical energy directly into the electrolyte. The amount of energy stored in the battery is proportional to the concentration of redox species or simply to the amount of the electrolyte used. The redox reactions happen at the electrode surface assembled inside the battery, and the electrolyte containing the active redox species flows across the electrodes from the adjacent reservoirs. Minimal single cell design variations are required to use different electrolyte chemistries, barring the widely and commonly used Vanadium redox ions. This flexibility enables adjusting the active redox species comprised on the electrolyte, with locally abundant transition metals. The redox potentials of the mentioned metallic compounds lie outside the electrochemical stability range of aqueous electrolytes. The research community addresses increment in electrochemical operation range by introducing the non-aqueous RFB (NAqRFB) technology.The latter allowed to explore more promising redox ions for NAqRFB. An ideal redox ion should i) have great abundancy; ii) be cheap, iii) provide fast multiple electron transfer per reacting molecule, and iv) possess reversible kinetics mechanisms, therefore not compromising the system's stability by generating irreversible side reactions. This thirst is quenched by Aluminum-ions (Al3+), which demonstrate the mentioned features besides having high energy density and high value of negative redox potential, i.e., -1.7 V vs. Ag/Ag+ allow higher cell potential. In this regard, an aluminum-ion-based non-aqueous redox flow battery was introduced in this study as a proof-of-concept. The aluminum redox ion is used as negolyte coupled with the posolyte based on the redox ions of metal acetylacetonates - M(acac) (where, M = Cr, Fe) - and Ferrocene (Fc). The insertion of the mentioned metals at the posolyte while keeping aluminum ion at the negolyte ensured the generation of novel chemistries for NAqRFBs, in detail Al||Cr, Al||Fc, and Al||Fe with cell potential differences of 3.2 V, 1.26 V, and 0.8 V, respectively.The reversibility of the redox ions in the electrolyte is compulsory and crucial for the operation of RFB. Cyclic voltammetry (CV) was performed for the non-aqueous electrolytes with acetonitrile as solvent and TEABF4 as supporting electrolyte. The redox ions of Al/Al3+, Cr4+/Cr5+, Fc/Fc+, and Fe3+/Fe4+ were used as active species and proved to be reversible on a glassy carbon working electrode (GCE); said attained redox couple potentials (vs. Ag/Ag+) were -1.7 V, 1.5 V, 0.1 V, and -0.9 V, respectively. Detailed electrochemical characterization was performed in a single NAqRFB, using polarization curve analysis, electrochemical impedance spectroscopy (EIS), and charge-discharge cycling (CDC) – Table 1. Post-mortem CVs of the electrolyte using GCE highlight the stability of the electrolyte after intensive CDC.The RFB assembled with Al||Cr offered the capacity and energy density performance. The CV results highlight that the redox reaction is quasi-reversible, affecting the battery performance and stability. The RFB composed of Al||Fc offers the highest capacity and energy density than others and is three times more than reported Al||Cr NAqRFB. The post-mortem analyses on the posolyte signify that there was crossover through the membrane, which ended up with a contaminated electrolyte (mixture with negolyte chemistry) that affected the extended capacity of the cell. Reinforced membranes permit to decrease the permeability of the membrane toward smaller ions of Al3+ as compared to Fc+. Further optimization of the membrane is required to improve the promising Al||Fe RFB, perhaps to reach the energy efficiency of 90%. Furthermore, the Al||Fe battery demonstrated a stable performance up to 50 cycles and the second-highest energy density ca. 25.9 mWh.g-1 compared to other versions of aluminum-ion-based non-aqueous redox flow batteries. This work is still in progress for in-depth study covering other aspects and ascertaining the feasibility of Al based RFB to be the new generation of NAqRFBs. Figure 1