[en] The report is the culmination of a study performed to develop designs and associated capital cost estimates for multi-unit nuclear and coal commercial electric power stations, and to determine the distribution of these costs among the individual units. This report addresses six different types of 2400 MWe (nominal) multi-unit stations as follows: -Two Unit PWR Station - 1139 MWe Each; -Two Unit BWR Station - 1190 MWe Each; -Two Unit High Sulfur Coal-Fired Station - 1232 MWe Each; -Two Unit Low Sulfur Coal-Fired Station - 1243 MWe Each; -Three Unit High Sulfur Coal-Fired Station - 794 MWe Each; -Three Unit Low Sulfur Coal-Fired Station - 801 MWe Each. Recent capital cost studies performed for ERDA/NRC of single unit nuclear and coal stations are used as the basis for developing the designs and costs of the multi-unit stations. These single unit capital cost studies are identified in the Foreward of this report. This report includes, the Major Study Groundrules, a Summary of Single and Multi-Unit Stations Total Base Cost Estimates, Details of Cost Estimates at the three digit account level and Plot Plan Drawings for each multi-unit station identified above