Which utility bill companies report to credit agencies?
Well who knows what any individual merchant may do, but generally speaking, it will be companies that you have "credit" (i.e. a loan) with that will report to credit agencies. There has been some effort to get certain other types of businesses to report, landlords, for example. But your cable company and others that you just pay a monthly bill to, as a rule, do not report satisfactory payments to the credit bureaus.