A synthesis gas (H2+CO) that comes from a gasifier is supposed to be used in more efficient and optimal manner, particularly for generating electricity, whereby then, CO2 that occurs at the same time is supposed to be passed to storage. This is achieved in that—the synthesis gas (H2+CO) and oxygen (O2) from an air separation system are combusted in a burner, and relaxed by way of a gas turbine (driving a generator), —CO2 is separated in the waste gas stream and passed to a compressor driven by the gas turbine, and—passed to CO2 storage as compressed CO2.