When you buy a solar system, think of not only reducing your own electric bills, think of selling energy to tenants. Utility companies allow you to sell power to any contiguous landowner.
If you own your building and have tenant, CitiGreen offers a monitoring and billing system called CitiWatch that is revenue grade, includes billing software, and has everything you need to accomplish your goal.
If you own your building in an entity other than your business and presently pay yourself rent, or plan to in the future, you can do the same with electricity. Let your future income increase by billing for rent and electricity.
The time is now to Go Solar with CitiGreen.