Oil vs. astronomy: Race to protect night sky in West Texas
West Texas is famed worldwide for its vast crude oil reserves. But for over 75 years, a small patch of the Permian Basin has also been valued for its pitch-black night sky.
Those two prized natural resources have clashed in recent years as oil drilling has brightened the sky near McDonald Observatory. A collaboration between the petroleum industry and the observatory – home of North America’s largest telescope – appears to have made progress in slowing the creeping light pollution.
But there are no guarantees about the night sky’s future as Permian Basin production hits record levels and drilling inches closer to one of the darkest spots on the continent.
“Fortunately, we’re far enough away – at least for now – from most of the oil and gas activity,” said Bill Wren, special assistant to the observatory’s superintendent. “And we’re surrounded by mountains, so we don’t actually see it line-of-sight. We just see a glow on the horizon. … The sky overhead is still incredibly dark.”
To understand what was happening to their night sky, staff at the University of Texas-owned observatory started measuring the amount of artificial light in August 2015. The sky then was 14 percent brighter on average than if the region had no artificial light. By November 2018, it was 43 percent brighter.
While the increase is worrisome, it’s not a disas- ter. Almost all of that light is low in the sky. “Astronomers typically are not aiming their big research telescopes down in the dirt to look at objects close to the horizon,” Wren said.
For now, there’s been no measurable increase in brightness in the night sky high overhead, he said. But the overall increase in light has changed the way the observatory operates from its perch above the West Texas plains.
“For most of the history of the observatory, the brightest thing in our sky – apart from the sun and the moon – was El Paso and Juarez,” Wren said, pointing out that those cities are 160 miles away. “Now you can see that El Paso is largely swamped by the sky glow coming from the Permian.”
‘GATES OF HEAVEN’
The observatory outside Fort Davis exists thanks to East Texas banker William Johnson McDonald. With no wife or children, he left his estate – worth nearly $1 million in 1926 – to the university. His demand was that UT create an astronomical observatory, one with a telescope large enough to peer into the “gates of Heaven.”
University officials found an ideal site in the Davis Mountains, thousands of feet above sparsely populated West Texas.
The telescope was the world’s second-largest when it was dedicated in 1939 and trailed only the Mount Wilson Observatory near Pasadena, Calif.
When McDonald Observatory was built, Wren said, light pollution from the booming Los Angeles area was already starting to affect Mount Wilson’s research.
LIGHTING THE WAY
Telescopes and oil drilling were never designed to coexist.
Signs on the final stretch of road leading to McDonald Observatory warn against the use of headlights. And when staff members wander about in the dark, they use small lights that provide just enough illumination to guide their paths.
A few dozen miles away, 24-hour drilling operations are underway with light towers, each powerful enough to illuminate a half-dozen or more acres.
While those two worlds are now in conflict, there isn’t a fight over who wins.
After reaching out to the industry several years ago, Wren said he’s received largely positive responses. Early offers of help came from Stacy Locke, president and CEO of San Antonio-based Pioneer Energy Services.
Working with Pioneer Energy Services and the Apache Corp., Wren has been able to assemble guidelines for lighting drilling rigs that are beneficial to both sides.
The overall ideas were simple. Shield the lights and point them downward to reduce glare. Also, switch from bluish “daylight” LED lights to softer yellow ones.
It took some technical know-how to implement those broad ideas. But the final results have been endorsed by the Permian Basin Petroleum Association, Texas Oil and Gas Association and the American Petroleum Institute. The Texas Railroad Commission, which regulates the industry, has previously sent dark-skies information to drillers near the observatory, and a spokeswoman said there are plans to do so again.
“Without mitigation, the gleam of light from oil and gas operations could compromise the research for which the McDonald Observatory is famous,” the railroad commission wrote in a 2016 letter to operators.
Apache Corp., a partner with McDonald Observatory in its Dark Skies Initiative, has implemented those best practices on all sites near the observatory. Buy-in from Apache was critical since its 350,000-plus-acre Alpine High discovery is the closest field to the observatory. In late December, Apache had seven active drilling rigs there.
Marcus Bruton, manager of health, safety and environment for Apache, said he was skeptical at first of this dark-skies effort. The conventional wisdom in the oil patch, he said, was that more light was better.
“I had to see it for myself,” Bruton said. “I had to see the light properly aimed and illuminating the location the way that they do before I really believed it.”
Now, Bruton said, he and the rest of the company are convinced. Darkskies lighting is now part of new employee and contractor orientations. The company’s in-house staff checks more than 1,000 lights a week to ensure that they’re compliant.
Bruton said that when 100 percent compliance was announced at a staff meeting for the first time, there was a round of applause.
“When you get ’em all, that’s when you know that it’s more than just an initiative, it’s more than just something we talk about,” he said. “It’s in your culture.”
The Milky Way streams across the sky above the McDonald Observatory, which is perched overlooking the West Texas plains. Astronomers there are working with oil drillers to preserve the region’s once-famous pitch-black night sky.