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Arizona Public Service (APS) says it plans to keep the Four Corners Power Plant operating beyond its previously planned 2031 exit. The utility has not announced a new retirement date. It says the plant’s future duration will be determined through its integrated resource planning process, and that the Navajo Nation lease allows operation through 2038.
What changed in APS’s Four Corners coal plant plan?
APS’s 2023 Integrated Resource Plan described leaving Four Corners in 2031. In a statement published October 2, 2026, APS said it now plans to extend operations beyond that year. The change is a reversal of a planned future exit—not a restart of a plant that had already closed. APS has not specified how many years beyond 2031 it intends to operate. Its current explanation says the operating horizon will continue to be evaluated through its resource-planning process.
APS also says the Navajo Nation lease allows operation through 2038. That describes a lease horizon, not a commitment to run the plant until that year or an announced closure date.
Why does APS say it wants to extend operations?
APS cites Arizona’s rising electricity demand, reliability, affordability, and the value of keeping existing generation available. The utility says its planning indicates continued operation could reduce customer costs compared with a modeled 2031 retirement scenario. That is APS’s characterization of its analysis: the public statement gives neither the projected savings amount nor the model assumptions, sensitivity analysis, or full comparison with alternatives.
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APS’s October 2026 statement says operating beyond 2031 “could result in a meaningful reduction in costs to customers” compared with modeled retirement that year. It does not establish that bills will fall, or that extending the plant is less costly than every replacement option.
How much power does Four Corners provide?
APS reports that the plant’s two units provide approximately 1,540 megawatts (MW). APS owns 63%—about 970 MW—and says it employs about 250 people at the plant. These are figures reported by APS, not an independent assessment of output at any particular time.
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The Arizona Corporation Commission (ACC) separately estimated in 2024 that approximately 970 MW of dependable capacity was at stake in APS’s planned exit. Its estimate concerns dependable capacity, not a claim that the plant produces that amount continuously.
What has Arizona’s Corporation Commission required?
On October 9, 2024, the ACC adopted an integrated-resource-plan amendment by a 4–1 vote. The amendment requires APS to demonstrate adequate dependable and dispatchable resources before exiting Four Corners and to report progress annually. The ACC’s order framed the planned coal exit as a resource-adequacy question: replacement capacity must be dependable and available when needed.
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The available materials do not establish how APS’s 2026 plan changes its compliance filings or the commission’s subsequent oversight. The amendment is the regulatory context for the earlier planned exit, not proof of the current status of any later filing.
What does the extension mean for the Navajo Nation and nearby communities?
Navajo Transitional Energy Company (NTEC), which says its Navajo Mine supplies Four Corners, welcomed APS’s decision on October 1, 2026. NTEC emphasized employment and revenue for the Navajo Nation. Its press release reported more than $128 million in annual economic impact, more than 350 mine employees, approximately 35% of the Navajo Nation General Fund coming from taxes and royalties paid by the mine and plant, and more than $1.7 million in community contributions during 2025.
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Those are NTEC’s company-reported figures, not independent estimates of the extension’s effects. The release does not isolate what continuing Four Corners beyond 2031 would add. The available material also does not establish an official Navajo Nation government position on APS’s 2026 decision or provide an independent assessment of its incremental effects on jobs, public health, air quality, water, emissions, or reclamation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What would a fair comparison with retiring in 2031 need to show?
APS’s public explanation does not provide a complete side-by-side accounting. To assess whether continued operation is more reliable or affordable, a comparison would need consistent assumptions for both paths and would need to cover:
- Reliability: the plant’s dependable, dispatchable contribution during peak demand and the timing and capability of replacement resources.
- Customer costs: fuel, maintenance, environmental compliance, retirement costs, and the cost of replacement generation or other resources.
- Practical constraints: the plant lease, coal supply, co-owner arrangements, and any approvals or decisions needed to extend operations.
- Community and environmental effects: emissions, air quality, water, health, employment, tribal revenue, and transition support.
The public statements cited here do not resolve that full comparison. APS’s affordability claim and NTEC’s economic-impact figures address different questions and should not be treated as a single independent estimate of the costs and benefits of an extension.
How did the decision develop?
- 2023: APS’s Integrated Resource Plan described a 2031 exit from Four Corners.
- October 8–9, 2024: The ACC adopted its amendment requiring APS to demonstrate adequate dependable and dispatchable resources before exiting.
- October 1, 2026: NTEC welcomed APS’s plan to extend operations beyond 2031.
- October 2, 2026: APS publicly stated that it plans to operate beyond 2031, without naming a new retirement year.
APS had earlier announced a conditional proposal for seasonal operation beginning in fall 2023 while transitioning toward a 2031 coal exit. That historical proposal should not be taken as confirmation of the plant’s current operating schedule.
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