The CONCEPT-5 computer code, which is publicly available, produces conceptual capital cost estimates for light water reactor and coal-fired power plants in the United States at any point in time. The code, based on the premise that any central station power plant involves approximately the same major cost components regardless of location or date of initial operation, has detailed cost models for each plant type at a reference condition. Through the use of size, time, and location dependent cost adjustments, a reference cost model is modified to produce a specific capital cost estimate. The user has flexibility in selecting many variables, including plant type, schedule, size, number of units, location, interest and escalation rates. Discussed will be the methodology used in the code, the input and output options available to the user, as well as specific capital cost estimates for nuclear and coal-fired power plants.