The Residential Demand Price Plan offers price breaks for customers who can be conscious of when they use energy and how much energy they're using at one time. Current trends show that demand is high in Phoenix despite rising home prices.Shift the Demand or Supply curve based on the scenario. In this study we estimate a residential water demand function for the City of Phoenix between 2000 and 2008. Your energy rate is based on the time of day; use less energy and manage energy demand during on-peak hours, between 4pm-7pm weekdays, to save. I just can't figure out exactly what a demand charge is. The Phoenix Water Services Dept. Is proposing a rate increase to keep up with rising water and wastewater services costs. The Phoenix rental market is experiencing price increases that are growing faster than almost any other large metro. Though demand overall was negative in the past year, some submarkets logged strong absorption.