Use this Guam Power and Guam Waterworks Authority bill payment app as a helpful tool to aid in making bill payments. Now you can pay your bills in one place, on the go and in half the time. GPWA provides a simple and secure way to pay your power and water bills from anywhere, anytime. Never miss another payment with on-the-fly information about your account balance and due date. See for yourself how fast, simple and hassle-free paying your power and water bills can be with GPWA mobile app bill payment solution.