Jeffrey B. Guldner
Chairman, President & Chief Executive Officer at Pinnacle West Capital
Great. Thanks, Amanda, and thank you all for joining us today. 2023 has started off in line with the financial guidance that we provided on the fourth quarter call in February. And before Andrew discusses the details of our first quarter results, I'll provide a few updates on recent operational and regulatory developments. First off, as you know, safety is our number 1 priority, and I do want to take this opportunity to congratulate our employees for keeping safety in sharp focus in the first quarter, especially through an unseasonably long and challenging winter period.
We discussed summer preparedness quite extensively, and that is our longest and highest peak demand season in Arizona. But winter preparedness is also an important part of how we reliably serve our customers throughout the year. We have an extremely diverse and broad service territory, serving 11 out of 15 counties in Arizona. And so in addition to the desert regions that most people associate with the state, APS also serves communities at much higher altitudes. This year, northern Arizona saw one of the wettest winter seasons in recent history.
In fact, Flagstaff set a record for the second highest snowfall total through March one in over 100 years. Despite slippery roads, hazardous conditions and freezing temperatures, our crews were able to restore power safely and quickly to our customers when they needed it the most. With winter now officially behind us, we've quickly moved to preparing for the summer. While we always have had a robust summer preparedness program, resource adequacy continues to be extremely important as energy supplies in the southwest tighten.
To serve our customers with top-tier reliability each year, we perform preventative maintenance, emergency operations center drills, acquire critical spare equipment, conduct fire mitigation line controls and execute a comprehensive plan to support public safety and first responders. Also during the first quarter, our Palo Verde nuclear facility operated a 100% capacity factor. Unit two is currently in a planned refueling outage that began on April eight and is on schedule to return to service in early May.
Upon successful completion of the latest refueling outage, all three units are poised to provide around-the-clock clean energy to help meet the demands of the summer for the entire Desert Southwest. In addition, our resource planning process helps ensure long-term resource adequacy and progress towards our clean energy commitment. We do plan to file our 2023 integrated resource plan later this year. That will include a 15-year forecast of electricity demand and the resources needed to reliably serve our customers.
We're currently engaging with a wide variety of stakeholders to gather input and feedback as we prepare that plan. I'm also extremely pleased to announce the completion of 141 megawatts of APS-owned batteries at our Arizona sun sites with an additional 60 megawatts that we expect to be completed by midyear. We also expect our 150-megawatt Agave solar plant to be in service in the next few months. We look forward to having these critical resources serve customers during the peak summer season.
And we're also finalizing project selections from our 2022 all-source RFP, and we've recently signed four PPAs to be in service by 2024 and 2025. Finally, APS is actively working on another all-source RFP that's expected to be released midyear, and that will be for new resources to be in service by 2026 through 2028. Additionally, we reached an exciting milestone in our clean energy journey on March 26 when our highest hours served by clean percent metric peaked at 99%. And during that hour, we also reached 58% renewable energy.
Our participation in the energy imbalance market and our continued effort in exploring an expanded Western energy market will be critical to maintaining customer reliability and affordability into the future. We're also starting the year with solid J.D. Power Residential Customer Satisfaction Survey scores that firmly place APS within the second quartile for overall satisfaction when compared to its large investor-owned peers. We made gains in both power quality and reliability and corporate citizenship in the first quarter, and this was especially positive, given the challenging winter season that I spoke about earlier.
We look forward to continuing to make improvements for our customers and providing a more frictionless customer experience. And then turning to regulatory. We continue to work through the rate case process. Expect that staff and intervenor direct testimony will be filed right now scheduled for May 22 for revenue requirement and June five for rate design. In addition, in March, we received a favorable decision from the Arizona Court of Appeals on our appeal of the last rate case decision.
We are pleased that the Court of Appeals clarified the prudency standard that must be applied by the commission in their evaluation for recovery of investments that we make. The Four Corners Power Plant is a critically important reliability asset for the entire Southwest region, and the investment in SCRs was required to keep that plant running under federal law. Right now, parties have until May eight to file a petition for review to the Supreme Court. No one has filed that petition yet.
And we look forward to working with the commission and other parties to resolve this in a matter -- in the most efficient way that we can. So although 2023 is off to a solid start, we know we still have much work to do, and we look forward to continuing to execute on our priorities throughout the year. And with that, I'll turn the call over to Andrew. Andrew?