The propulsion system of the RN ships will have a gas turbine direct drive and four high speed diesel generators driving two electric motors in a combined diesel-electric or gas (CODLOG) configuration. In 2012 Rolls Royce repackaged the MT30 used in the s so that it would fit into smaller ships. The MT30 will be used in the Type 26. BAE Systems have suggested that some customers will install gas turbine engines and others will prefer to sacrifice 2–3 knots of speed by choosing cheaper diesel engines. The CODLOG configuration for propulsion is a simpler version of the Combined diesel-electric and gas (CODLAG) propulsion used on the Type 23 which this ship is to replace, and both of the Global Combat Ship's design contemporaries – the "Queen Elizabeth"-class aircraft carrier and the Type 45 destroyer – use integrated electric propulsion (IEP).