Arizona Public Service (APS)
APS offers a tool that provides a customized solar (+storage) estimate for your home to understand your savings potential installing a rooftop solar system. For more information click here.
In addition to APS SolarSmart APS offers the APS Solar Communities program which is a unique opportunity for limited-income and moderate-income residential customers, who may not have considered solar as an option, to help advance solar in Arizona. APS handles the installation and any maintenance, while you get the bill credit.
Salt River Project (SRP)

SRP provides information about going solar, including SRP's preferred installer, solar price plans, and more. More information here.
Department of Energy

The Department of Energy provides many resources to assist with better understanding the process of going solar. The following are some helpful resources:
Homeowner's Guide to Going Solar
Homeowner's Guide to the Federal Tax Credit for Solar Photovoltaics
Federal Solar Tax Credits for Businesses
National Renewable Energy Laboratory (NREL)

NREL focuses on creative answers to today's energy challenges. The following are some useful resources:
Homeowners Guide to Leasing a Solar Electric System
Solar Energy Basics
PVWatts Calculator
City of Phoenix SolarAPP

SolarAPP is a third-party software program that can be used to verify code compliance for residential photovoltaic (PV) projects. The City of Phoenix Planning & Development Department (PDD) will accept SolarAPP approved designs for application and permitting of residential photovoltaic projects, reducing permitting times.
The Phoenix Fire Department requires a separate permit for photovoltaic and battery energy storage systems.