The present invention provides methods and systems for determining anticipated profit from facilities such as electrical power generation facilities, for determining values for assets based on profitability of facilities, and for determining optimal operational scheduling options for facilities. Methods and systems are provided which utilize a dynamic programming algorithm and a decision tree based model in which one or more operating constraints are implicitly modeled, facilitating computational tractability. Additionally, methods and systems are provided that utilize a dynamic programming algorithm and a decision tree based model that accounts for a combined effect of price paths with specified uncertainty as well as operational constraints. Furthermore, methods and systems are provided that address profitability, valuation, and scheduling in relation to a group, or portfolio, of facilities, accounting for liquidity factors as well as group, or global, constraints.