Although more advanced power generation systems can offer higher efficiencies against simple cycle gas turbines, the severe area and weight restrictions on petroleum offshore platforms keep on impeding their widespread application in the offshore oil and gas industry. Thus, if those restrictions could be ingeniously resolved, the utilities supply performance on offshore platforms may be drastically enhanced in terms of fuel consumption cutdown and reduced environmental impact. In order to overcome these practical limitations, a power hub, installed on a decommissioned floating, producing, storage and offloading (FPSO) unit, is used to centralize the power supply required by four productive FPSOs. However, since the electricity demands may undergo sharp variations over time, the power hub will operate most of the productive life at offdesign conditions. This circumstance renders necessary to determine the optimal number, layout and operating load of the various parallel modular power units well ahead its detailed design, so that a trade-off between higher overall efficiency and low investment cost is achieved over the entire lifespan of the project. Since the complexity of the problem increases as more flexible, but also lighter and affordable power generations systems are required, a computational framework is developed to assist in the selection of the most suitable configurations for the power hub technologies. The integrated approach consists of a set of subroutines that evaluate, compares and ranks those energy technologies to come out with the best configuration, depending on the input profile of energy demand to the power hub and the deck weight budget and space availability. This framework could be also extended to include high voltage energy transmission and reliability analyses of complex cogeneration systems.