Comparing fuel costs to operate your facility is a great way to save money. As an example, consider the following options to generate steam with a boiler

Natural Gas is running in the $ 10.00 range per million BTUs.
Number 2 oil is $ 3.00 per gallon.
Electricity is $ .10 per KWH.
Propane is $ 1.50 per gallon.
The best way to deal with energy data is to compare costs per million BTUs (MBTU). All of the following are equal to 1 MBTU-
1 MCF of natural gas
1,000 cubic feet of natural gas
1 decatherm of natural gas
10 therms of natural gas
293.1 KW of electricity
7.29 gallons of # 2 oil
10.93 gallons of propane
1,000 lbs of steam
29.31 boiler horsepower
Cost of 1000 lbs. of steam would be as follows for a typical boiler:
Natural gas fired @ 80% efficient is $ 12.50
Oil Fired @ 80% efficient is $ 27.34
Propane Fired @ 80% efficient is $ 20.49
Electric fired @ 98% efficient is $ 29.91
Being able to generate steam using multiple fuels can save you significant operating costs.