Apply Security Deposits to Utility Expense

What is the easiest way to apply security deposit (asset account) to my utility expenses? as you know, some utility company's require security deposits upon set up, after a year in good standing they start to refund your security deposit. I'm at that point where some utility companies are starting to apply our security deposits to the monthly statements. What is the easiest way I can start applying my deposit on file to the month expenses, etc. Help!