Integrated Electric Propulsion (IEP)
A system which uses both diesel engines and gas turbines to generate electricity for electric motors, where there is no mechanical transmission from either to the propellers, is not classified as CODLAG, but as integrated electric propulsion (IEP) or integrated full electric propulsion (IFEP). Such an arrangement is in use on passenger ships like RMS Queen Mary 2, with a pool of diesel generators for the base load and turbo generators for peak power, and on warships such as the Royal Navy's Type 45 destroyer and the upcoming Zumwalt-class destroyer (DDG-1000/DD(X)).
Read more about this topic: Combined Diesel-electric And Gas
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