Rental property ~ where to enter power reimbursement payments?

Hello,

 

I have two apartments and keep the power in my name so if I have a flaky renter and they don't pay the power bill the power won't be turned off and my pipes won't freeze.  Anyway, I bill the individual tenants their bill each month after I pay the full amount.  They reimburse me.  Do I include this in "rental payments" on the Schedule E worksheet?  Or somewhere else?  Thanks in advance for any assistance.