After a ship is delivered from a shipyard to a customer, its operational use is not yet structurally compared to its expected use. This lack of structural comparison results in limited verification and self-evaluation of the design process. The objective of this research is therefore to develop a method to analyze operational data and apply this operational data analysis method to the Royal Netherlands Navy Holland class Oceangoing Patrol Vessels (OPVs). These vessels use Combined Diesel Electric or Diesel (CODELOD) propulsion. The data analysis focuses on the electrical energy distribution system, because this determines a large portion of the total fuel consumption of the ships. Operational data from these ships was collected from the Integrated Platform Management System, which is installed on the OPVs. By applying the operational data analysis on the Holland class OPVs, the generator plant setup is evaluated. Based on the results from this analysis, a father-son generator setup is proposed, consisting of two 835 ekW gensets and two 475 ekW gensets. This setup has better redundancy, less fuel consumption, and a lower total installed power, compared to the three currently installed 920 ekW generators. The proposed father-son altenative setup reduces the total installed electric power by 5.1%, and saves 0.4% to 2.4% fuel consumption for electricity generation. To obtain an accurate calculation of fuel consump tion for widely distributed power consumption profiles, a power consumption distribution must be used instead of an average value.