Interruptable power will get you a much better rate. How fast can an ammonia plant electrical load be ramped up or down? If load can be dropped off or picked up quickly enough the utility might give a much better rate for power. Going from 100% load to 20% load in under a minute would be very valuble. The lower cost of the electricity might make the plant competitive. A large industrial load that can be picked up or dropped off quickly is as good as a gas turbine for load leveling. Bonneville Power has a program to pay industries to reduce load in critical periods, which is cheaper than buying peaking power in certain areas (especially the Olympic peninsula in Washington).