Systems (30), program product (51), and methods to optimize energy management for a site including a combined steam heat and electrical power system, is provided. A system (30), for example, can include a computer (31) including memory (35), and energy utility modeling program product (51) stored in the memory (35). The system (30) can rigorously target, without manual iteration, for multiple utility commodity targets to include their global minimum and maximum requirements or capabilities, individually, or subject to other to target objectives, due to varying process conditions. The system (30) can also obtain the supply and demand best and worst case scenarios due to varying process conditions for a given process or cluster of processes. The system (30) can also provide such data subject to other supply and demand objectives, and can further provide a range of commodity requirements or capabilities subject to user selected values for other commodity requirements or capabilities.