Arizona Clean Energy Guide

Arizona's exceptional solar resources and growing energy demand have made it a major hub for utility-scale solar and battery storage development. This guide covers the state's clean energy landscape, utility programs, and the forces shaping Arizona's energy future.

Solar Resource Excellence

Arizona receives some of the best solar irradiance in the United States, with parts of the state averaging over 6.5 kWh/m²/day—among the highest globally. Combined with over 300 days of sunshine annually, vast available desert land, and proximity to California's energy markets, Arizona has become a premier destination for utility-scale solar development.

The state ranks among the top five nationally for solar capacity, with particular concentration in the central and southern regions. Solar projects in Arizona achieve capacity factors well above the national average, making them economically attractive for developers and utilities alike.

Major Utilities and Clean Energy Commitments

Arizona Public Service (APS)

APS, the state's largest utility serving about 1.3 million customers, has committed to achieving carbon neutrality by 2050, after dropping its earlier 100% clean energy by 2050 pledge and 65% by 2030 interim target in August 2025. The utility is pursuing this through:

• Solar Procurement: Large-scale competitive solicitations for utility-owned and PPA solar projects
• Battery Storage: Pairing storage with solar to shift generation to evening peak hours
• Coal Transition: Retired the Cholla plant in March 2025, though Four Corners is now slated to operate as late as 2038
• Palo Verde Nuclear: Operating the nation's largest three-unit nuclear plant, providing substantial carbon-free baseload

Salt River Project (SRP)

Salt River Project, a public power utility serving the Phoenix metropolitan area, has set a target of reducing its carbon emissions intensity 82% by 2035 (from 2005 levels) and reaching net-zero carbon by 2050. SRP's service territory includes major data center developments and industrial load growth, driving significant clean energy procurement.

SRP has been active in solar and storage development, with multiple projects across its service territory. The utility's rate structures have evolved to better accommodate solar customers while ensuring grid cost recovery.

Tucson Electric Power (TEP)

Tucson Electric Power serves southern Arizona and has committed to providing customers with 70% renewable energy by 2035, targeting net-zero carbon by 2050. TEP has retired coal generation ahead of schedule and is procuring substantial solar and storage capacity.

Battery Storage Market

Arizona has emerged as a major battery storage market, driven by the need to shift abundant daytime solar generation to evening peak demand hours. Storage also provides grid reliability services increasingly important in a system with high renewable penetration.

Major storage deployments include projects co-located with solar farms and standalone installations. The 2019 McMicken battery fire led to enhanced safety protocols across the industry, and Arizona utilities have continued expanding storage with improved safety standards.

Data Center Demand

Arizona, particularly the Phoenix metropolitan area, has attracted major data center investments from Microsoft, Google, Meta, Amazon, and others. These facilities require substantial electricity and increasingly demand renewable energy to meet corporate sustainability goals.

Data center demand is driving both utility clean energy procurement and direct corporate power purchase agreements. The intersection of tech industry growth and clean energy development creates a positive feedback loop, with utilities building renewable capacity to serve customers who require it.

Policy Environment

Renewable Energy Standard

Arizona's Renewable Energy Standard required regulated utilities to derive 15% of electricity from renewable sources by 2025, with 30% of that from distributed generation. In March 2026, the Arizona Corporation Commission voted unanimously to repeal the standard, leaving Arizona without a renewable portfolio standard; clean energy development is now driven by utility procurement rather than state mandates.

Net Metering and Rooftop Solar

Arizona has been a battleground for net metering policy. After a period of robust rooftop solar growth, utilities successfully advocated for reduced net metering compensation and demand charges for solar customers. These changes slowed the residential solar market, though the utility-scale sector continues to thrive.

Key Developers Active in Arizona

• NextEra Energy Resources: Major solar developer with extensive Arizona portfolio
• AES Corporation: Solar and storage development
• Invenergy: Utility-scale solar projects
• Canadian Solar: Large-scale solar development
• EDF Renewables: Solar and storage projects
• Longroad Energy: Utility-scale solar developer

Challenges & Outlook

Arizona faces challenges common to high-growth renewable markets. Transmission constraints limit the ability to deliver power from remote solar-rich areas to load centers. Water scarcity, while not directly affecting solar operations, is a broader concern for the state's growth and economic development.

The state's political environment has been mixed on clean energy mandates, though utility voluntary commitments continue to drive development regardless of policy changes. Grid reliability during extreme summer heat—when air conditioning load peaks—remains a priority for system planners.

Looking ahead, Arizona is well-positioned for continued clean energy growth. Excellent solar resources, growing demand, available land, and utility procurement plans all support ongoing development. Battery storage will play an increasingly important role in managing the gap between solar generation and evening peak demand.

Frequently Asked Questions