What is kWh worth at your plant?

A trivial question, which does not have a simple answer without the context. Consider a plant that in the last month used 1,000,000 kWh to produce 10,000 units and paid $15,000 for electricity. Does kWh cost $0.15? Is energy cost per unit $1.5? Yes, No and Maybe. Cost or value of a kWh depends on [...]