Yes. The estimated bill is designed to keep payments on schedule to avoid a future larger bill that covers multiple months, which may be more difficult to pay and may lead to service interruption. If the estimated amount is higher than your actual usage, you will receive an adjustment on the amount overpaid as a credit, and it will go toward your next bill(s). If the amount estimated is lower than your usage, any additional amount owed will appear on your adjusted statement.
If you are unable to pay your estimated bill, you have options.
You can check and see if you are eligible for a payment arrangement or extension. This can be done online by signing into Your Account. If you don't have an online account, you can create one. You can also make a partial payment of the balance until you receive the adjusted bill.