The following different valorisation processes of banana peel waste (BPW) were evaluated: combustion, production of activated carbon/batteries, and biomethanisation. This study showed that the combustion of BPW is an interesting option with a zero-carbon cycle. A mass balance demonstrated a low concentration of sulphurous compounds in the flue gases (0.01%, in volume), but the content of structural nitrogen dioxide was remarkable (0.35%). Additionally, BPW should be pre-dried to increase its lower calorific value (LCV) upto 3000 kcal/kg. In contrast, the mesophilic biomethanisation of BPW led to the generation of renewable methane (182 LCH4/kg VS, volatile solids) and organic digestate, whereas its biodegradability was found to be 68% under the study conditions. The obtention of porous activated carbon was also demonstrated by employing a simple and low-cost method based on chemical activation/carbonisation of BPW with KOH porogen. The banana peel waste carbon (BPW–C) obtained showed low crystallinity, high purity, and Brunauer-Emmett-Teller surface area (SBET) of 264 m2/g. BPW-C was tested as an anode electrode in lithium-ion batteries (LIBs), and a remarkable reversible capacity of 225 mAh/g at 0.2 C after 200 cycles was observed. These results indicate the feasibility of the carbonisation method of BPW to produce a highly demanded product in the current society. Display omitted •Banana peel waste (BPW) was subjected to different valorisation processes.•Low concentration of thermal NOx is generated by burning BPW after drying.•Biomethanisation of BPW produced 182 mLSTPCH4/gVS and allowed removing 68% of waste.•A simple chemical activation and carbonisation process of BPW was demonstrated.•BPW showed good reversible capacity as anode for lithium-ion batteries (225 mAh/g).