READING, Pa. -

UGI customers can soon expect an increase in their energy bills.

Starting in June, natural gas costs are expected to rise about four percent for the average customer, the utility announced Monday.

The Reading-based natural gas company said the increase is due in part to record-breaking temperatures and unprecedented demand this past winter.

If UGI's proposed rates are approved, the monthly bill for a typical residential heating customer who uses about 8,500 cubic feet (ccf) of natural gas per month will increase from $86.38 to $89.85.

So far, UGI said it doesn't see a reason for the rates to change again in December.

UGI serves 391,000 customers in 15 southeastern Pennsylvania counties.