Texas Greenlights Coal Plant Retirement, 3.7 GW of Wind, Solar, and Storage to Replace It

In the Texas Panhandle, a coal plant that has been burning fuel and drinking groundwater since the early 1980s is finally on a set retirement clock. In early October 2026, the Texas Public Utility Commission approved a plan from Southwestern Public Service, the Xcel Energy subsidiary better known as SPS, to retire its coal-fired Tolk Station by early 2029 and replace it with roughly 3,700 megawatts of new generation. The replacement mix is the story: about 1,100 megawatts of wind, 189 megawatts of solar, and 322 megawatts of battery storage, enough, the company says, to power roughly 375,000 households across Texas and New Mexico.

What regulators actually approved

The order covers the Tolk Station near Muleshoe, west of Lubbock, a plant that dates to the early 1980s and has been one of the region's largest industrial water users for four decades. SPS asked Texas regulators for permission to close the plant and build a replacement portfolio, and New Mexico regulators signed off on the construction side as well, since SPS serves customers in both states through the Southwest Power Pool.

The approved replacement package, first reported by RTO Insider on October 5 and detailed in subsequent coverage, breaks down as follows. Wind gets the largest share at about 1,100 megawatts. Solar contributes 189 megawatts. Battery storage adds 322 megawatts of dispatchable capacity. And the plan includes two natural-gas peaker plants in Texas, approved under strict cost caps, which the commission insisted on to cover reliability during the transition.

The gas inclusion is worth pausing on. Regulators did not simply swap coal for renewables on faith. They allowed a limited amount of gas backup, with explicit cost restrictions recommended by the commission's chairman, so the utility cannot treat the peakers as a blank check. The result is a blended portfolio: mostly wind, solar, and storage, with a capped gas backstop rather than a like-for-like fossil replacement.

A water story as much as an energy story

The Sierra Club, which has worked on the Tolk plant for years, framed the ruling as a water victory as much as a climate one. Its analysis, cited in coverage of the decision, found that Tolk drew about 1.2 billion gallons of groundwater in 2024 from the Ogallala Aquifer, the slow-recharging aquifer that underlies the Texas High Plains. Water use has fallen from a peak of roughly 3.3 billion gallons annually in 2015, but the plant remains a heavy consumer in a drought-prone region where farmers and towns compete for the same shrinking supply.

Josh Smith, an attorney with the Sierra Club's Environmental Law Program who has worked on the Tolk plant for years, said the ruling shows "a common-sense path in Texas to transition away from expensive, dirty, thirsty coal," adding that "Texas doesn't need coal anymore, even as it prepares for increased demand." When Tolk closes, he said, it will "save abundant water in a drought-prone region, millions of ratepayer dollars, and eliminate millions of tons of harmful pollution every year, making rural West Texas a healthier place to live."

Texas doesn't need coal anymore, even as it prepares for increased demand. The ruling is a water victory as much as an energy one.

The emissions numbers help explain the urgency behind the advocacy. In 2025 alone, the plant released an estimated 3.2 million tons of carbon dioxide, 5.4 million pounds of nitrogen oxide, and 15.5 million pounds of sulfur dioxide. A health analysis attributed roughly 10 premature deaths per year to the plant's emissions, with the toll falling mainly on surrounding rural counties. Retiring the unit eliminates those emissions in a single decision rather than chipping at them across many smaller ones.

A retirement date six years in the making

Tolk's closure has been negotiated for years. Under a 2020 agreement with the Sierra Club, Xcel had already committed to retiring Tolk no later than 2032, and to study earlier retirement scenarios as the plant's economics deteriorated and Ogallala groundwater grew scarcer. SPS later proposed an even earlier shutdown in December 2028. The rulings from Texas and New Mexico regulators in early October 2026 settled the date at early 2029, landing between the original 2032 backstop and the utility's accelerated proposal.

That timeline matters for two reasons. First, it shows how coal economics keep pulling retirement dates forward rather than pushing them back: Tolk's earlier dates were driven by the plant's declining economics, not only by advocacy. Second, replacing a major baseload unit takes years of regulatory proceedings, transmission studies, and construction timelines, which is why the wind, solar, and storage projects now being built were initiated long before the final vote.

What it signals about Texas power

There is an easy misconception to clear up: this decision does not change the Texas grid most people know. Tolk sits in SPS territory, the regulated, vertically integrated corner of the Panhandle and South Plains, served through the Southwest Power Pool rather than the deregulated ERCOT market that covers Houston, Dallas, and most of the state. Customers there cannot shop for retail electricity plans, so the new generation will be recovered through regulated rate cases rather than through a competitive plan menu.

Still, the ruling is one more marker of a statewide shift. Across the ERCOT grid, cheap solar, wind, and fast-growing battery storage have been steadily displacing coal, with solar generation on track to exceed coal for the first time. The Tolk package follows the same logic in regulated territory: renewables and storage do the heavy lifting on energy, batteries and a capped amount of gas cover reliability, and an aging coal unit whose fuel and maintenance costs keep rising exits the system.

One detail in the approval deserves wider attention. The battery component, 322 megawatts, is not a token add-on. It is roughly the scale at which storage starts to matter for evening peaks and short-duration ramping, the services that coal units historically provided.

The bill question

For SPS customers in Lubbock, Amarillo, and the surrounding Panhandle, the practical question is the monthly bill. Wind, solar, and storage carry very low running costs because they burn no fuel, which can help contain fuel-cost swings over time. The trade-off is that the capital to build them is added to the utility's rate base and recovered through future rate cases. A Sierra Club attorney characterized the shift as saving "millions of ratepayer dollars," but regulators did not publish a specific per-customer figure with the approval, so any precise dollar claim should be treated with caution.

What is clear is the direction of travel. A plant that burned fuel and drank a billion gallons of groundwater a year is being replaced, megawatt for megawatt and then some, by generation that burns nothing and drinks almost nothing. In a state adding load from data centers, industry, and population growth, the bet from Texas regulators is that wind, solar, and storage are the cheapest reliable way to keep the lights on. The next test is whether the replacement portfolio is built on schedule, and whether 2029 holds.