This white paper explores how Atlas Copco Gas and Process Companders drive efficiency in gas compression by integrating compressor and expander functions on one gearbox. This design reduces CAPEX and OPEX through compact footprints, faster installation, and direct energy recovery. With proven applications across LNG, petrochemical, and chemical plants, Companders improve performance, reliability, and sustainability. Case studies in nitrous oxide removal, phenol, and nitric acid processes demonstrate significant energy savings, supporting decarbonization and cleaner plant operations.