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Understanding Solar


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Does solar make sense for you?
If you're considering a solar system for your home, there are many factors that you should contemplate before making a final decision and signing a contract.

Things to know about rooftop solar

This guide will explain some of those factors and help you ask the right questions so you can make a well-informed decision.

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Connect your system safely to the APS grid
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Service plans for customers with solar

Once you decide to have solar installed, you'll want a service plan that helps you get the most out of your system. We offer a choice of residential plans that will help you save or earn credit on your monthly bill.

Paloma Solar Plant with a mountainscape and setting sun.

Your choice to choose green

For residents and businesses that want to make a commitment to cleaner energy, our Green Choice Program lets you select a percentage or set amount of energy you receive from renewable energy resources.

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Some things on your electric bill will stay the same, such as your monthly service charge and things like transmission and distribution charges to name a few.

Solar will only affect the kWh portion of your bill. Once your solar electric system is operational, you'll see kWh credits on your bill. Any excess kWhs will be applied to your bill based on your solar rate, either EPR-2 or Resource Comparison Proxy (RCP).

The kWh portion of your bill will be based on the readings from our bi-directional meter, also known as billable meter. The production meter (non-billable) installed on your home measures the overall generation of your solar electric system. The billable meter registers energy flowing from your solar electric system into your home and excess energy going to our grid. This is known as net billing.

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Budget Billing is a billing program that averages your energy use so you pay about the same each month. It is not compatible with the solar rate rider and net billing calculation.

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It depends on the solar rate you choose - RCP or EPR-2.

The RCP rate allows customers to receive a credit for excess energy sent to the grid. Any bill credit in excess of the customer's otherwise applicable monthly bill will be credited on the next monthly bill, or subsequent bills if necessary. After the customer's December bill, a customer may request a check for any outstanding credits from the prior year; however, if the outstanding credits exceed $25, we will automatically issue a check to the customer. Otherwise, the bill credits will carry forward to the following year.

And with the EPR-2 rate, known as net billing, you will receive a billing credit for excess kWh in the month the excess is generated. The credit will be deducted from your monthly bill.

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We encourage you to read our 8 Things to Know if You're Considering Rooftop Solar brochure. And remember to get quotes from three installers so you can compare.

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No, because we need 24-hour access to the new meter and utility disconnect. Production meters cannot be placed behind any type of gate or fence or be placed under a patio or any type of roof overhang or extension.

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On average, every 1,000 watts will produce 4 to 5 kWh, of electricity a day. If you have a 6 kW system, it would produce about 30 kWhs per day (6 kW x 5 kWh/day). In an average month, your system would generate approximately 900 kWhs (30 days x 30 kWhs/day). Your solar system's production information is available on aps.com. Go to "daily energy usage", "locate for service at" and change the drop-down to the address that has an asterisk. Then, you can download a spreadsheet for your records.

The amount of electricity your system produces is based on many factors. Some of these factors are: size of the system, orientation and tilt of the panels, and amount of sunlight hitting the panels. Some factors that limit the amount of sunlight reaching the panels are cloudy or overcast days, amount of dirt/dust on the panels, and shading from nearby trees, buildings, roof-mounted HVAC systems and chimneys.

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"Production" is the overall electricity generation of your solar system. "Credit" is the excess energy (kWh) produced by your solar system and sent to our grid. Any excess kWh is applied to your bill in the month generated.

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Yes, you will need to submit an application if you are changing the size of the inverter or adding an additional inverter.

For grandfathered systems, a customer may not increase the capacity of the grandfathered solar generation unit by more than a total of 10% or 1 kW, whichever is greater.

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Interconnection Documents and Requirements
APS provides support to customers installing equipment that connects with our grid, such as a solar system, a home battery or other type of generator. We want everything to go smoothly for you and your installer throughout the permitting and installation process. Please review our interconnection standards below — they protect your equipment and our electrical system, and keep everyone safe.

Assignment and Assumption of Contract

 

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Diagram Battery Only Checklist

 

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Diagram Checklist

 

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Disclaimer

 

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Document Guide

 

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Installer Checklist

 

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Interconnection Agreement

 

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Landlord/Tenant Rider Form

 

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Sample Executed Contract

 

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W-9 Form

 

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APS Electric Service Requirements Manual

 

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APS Interconnection Requirements

 

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Load Side Connection Requirements

 

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Supply Side Connection Requirements

 

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Commercial Interconnection Process Overview          (1 MWAC or more)

 

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Commercial Interconnection Process Overview (less than 1 MWAC)

 

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Assignment and Assumption of Contract Commercial

 

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Commercial Diagram Checklist

 

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Commercial Interconnection Agreement (Sample)

 

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Non-Incentive Commercial System Ownership Information Change Form

 

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Non-Residential ACH Form

 

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PBI Information Change Form

 

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Supplemental Dynamic Voltage VAR Response Testing Procedure Guidelines

 

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Commercial Diagram Requirements - Rotating Machinery

 

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Typical Commercial Diagram (Line Side)

 

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Typical Commercial Diagram (Load Side)

 

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Interconnection Agreement (Non-FERC sample)

 

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Interconnection Application (Study Agreement)

 

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Non-FERC Interconnection Process Overview

 

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Non-FERC Interconnection Queue Policy

 

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APS ESS Metering and Isolation Concept Drawings

 

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APS PV Solar Metering and Isolation Concept Drawings

 

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Consumer Acknowledgement

 

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Example Equipment Tags

 

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Interconnection Application

 

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Letter-in-Lieu of Electrical Clearance Form

 

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Single Phase 120-240V Fault Current AC Disco Guide

 

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Typical Wind Diagram

 

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Utility Disconnect Checklist

 

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Residential Renewable Energy Program Overview

 

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120V Battery System Diagram

 

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200A Typical Residential Diagram for Load Side Connection

 

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240V Battery System Diagram

 

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400A Typical Residential Diagram for Load Side Tap

 

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Typical Residential Diagram for Supply Side Tap

 

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If you have any questions, contact us at commercial-renewables@aps.com.
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