Method for storing excess energy

The subject matter of the invention is a method for utilization of gases containing CO and/or CO₂ comprising the process steps: A) Providing a gas stream of the gas containing CO and/or CO₂, B) Converting at least part of the gas stream into electrical energy, C) Converting at least part of the gas stream into at least one organic substance in a biotechnological, fermentative process and optionally D) Repeating the process steps B) and C).