In this latest article of our series on practical applications of Monte Carlo simulation we focus on the valuation issues associated with a physical asset, namely a merchant power plant. Typically these assets are valued on a simple net present value basis with respect to a static forward, or forecast, curve. The analysis that will be employed here takes into account both the stochastic nature of the fuel and output prices and also the physical constraints associated with operating the plant. This methodology is often termed “real options theory” and is an increasingly popular tool for valuing physical assets.