Arizona Public Service Moves to Extend Four Corners to 2038
Arizona Public Service (APS) has signed a coal supply contract extension with Navajo Transitional Energy Co. (NTEC) that would extend operation of the utility's coal-fired Four Corners Power Plant past its previously announced 2031 closure date to 2038, according to information the utility shared at its Resource Planning Advisory Committee meeting on Wednesday. The move effectively reverses a retirement commitment APS had made for the plant.
The announcement, detailed in a Sierra Club analysis, carries implications that stretch well beyond a single power station. Four Corners is one of the largest coal plants in the Southwest and has long been a flashpoint in debates over Arizona's energy mix, tribal economic development, regional air quality, and water use. By extending its coal supply agreement rather than winding down operations, APS is signaling that a facility many observers expected to close within the decade will remain part of the region's generation fleet into the late 2030s.
What the Extension Means for Ratepayers
According to Sierra Club's assessment, continuing to operate Four Corners for another seven years means Arizonans will pay the price through higher utility bills — even though the utility could save its customers millions of dollars by retiring the plant on schedule. That argument sets up the central tension in APS's resource planning: whether extending the life of an aging coal asset protects reliability and affordability, or whether it locks customers into costs that cleaner alternatives would avoid.
The extension announcement followed publication of a Sierra Club report examining APS's continued reliance on fossil gas. That analysis contends the utility's gas-heavy strategy keeps Arizonans tied to a toxic and volatile set of fuel commitments at a time when APS could instead prioritize ratepayers by investing in clean, renewable resources. In the group's view, coal and gas extensions are two sides of the same planning decision.
Air, Water, and Health Impacts
The environmental and public health stakes are substantial. Independent studies cited in the analysis have determined that fossil-fuel pollution is linked to roughly 8 million deaths per year worldwide. For those living near the plant — in the New Mexico region where Four Corners is sited, and across the Navajo Nation, whose tribal members have lived with the facility's harmful impacts for decades — the consequences are local and cumulative rather than statistical.
Continuing to operate the plant also means continued water consumption. In an arid region where supplies are already under strain, every additional year of coal-fired generation represents water that is not available for other uses. Sierra Club also warns that the extension would worsen climate impacts and increase air pollution, compounding health harms for surrounding communities.
Community Pushback: 'Delusional'
Nicole Horseherder, director of the Navajo advocacy organization Tó Nizhóní Ání, condemned the plan in blunt terms, calling the effort to keep a 60-year-old coal plant open in order to prop up NTEC 'delusional.' She argued that NTEC executives live in a reality far removed from that of people on the Navajo Nation, and that despite having access to the best available technical expertise, the company is choosing to continue an industry that contributes directly to climate change, pollutes the air, and harms human health.
Horseherder also pointed to the region's recent weather extremes — a summer that produced record numbers of heat waves, followed by flooding in many areas — and questioned why company leadership cannot, or will not, connect those events to coal. In her view, the choice is not a matter of missing information but of priorities.
A Scorecard That Gives APS an F
The extension arrives as APS received an F in Sierra Club's latest Dirty Truth Report, which grades utilities on several fronts:
- How much coal a utility continues to use in its generation fleet;
- How much new gas capacity it plans to build; and
- How much renewable energy it is adding to its portfolio.
Under that framework, utilities earn credit for clean-energy additions and lose ground for prolonging coal and gas. APS's grade reflects the group's conclusion that the utility is leaning too heavily on fossil fuels relative to the pace of its clean-energy buildout.
What Happens Next
On October 14, APS will hold a public meeting on its 2026 Integrated Resource Plan, the document that forecasts how the utility intends to meet energy demand over the next 15 years. The IRP is the venue where the Four Corners extension, gas planning, and renewable procurement will ultimately be weighed together, and it is expected to draw considerable public interest from ratepayer advocates, tribal communities, and environmental organizations.
APS has framed its resource decisions around the need to ensure it can meet energy demand amid extreme weather events — a rationale that critics say ignores both the falling cost of clean alternatives and the health toll associated with continued coal combustion. Whether regulators and the public accept that framing could shape not only the fate of Four Corners but the broader direction of Arizona's grid for a generation.
Why the Decision Matters Beyond Arizona
Four Corners is a case study in a national pattern: utilities that pledged to retire coal plants by a certain date, then extend operations as the deadline approaches. Each extension carries consequences that accumulate — more years of emissions, more water consumed, more costs spread across ratepayers, and more uncertainty for communities that organized around a closing date. The shift from 2031 to 2038 is a seven-year change on paper, but for residents of the Four Corners region it represents another decade of exposure and another decade of waiting for a transition that has been promised repeatedly.
For APS customers, the October 14 meeting is the first structured opportunity to weigh in before the 2026 Integrated Resource Plan takes shape. What happens there will help determine whether the utility's retirement commitments hold, or whether Four Corners keeps burning coal well past the date Arizonans were told it would stop.
This article is based on reporting by CleanTechnica. Read the original article.
Originally published on cleantechnica.com
