leading energy

Profile: Former Shell VP helps create a new way of making clean electricity with Houston company

Cindy Taff of Sage Geosystems shares her vision for her company and for the future of energy. Photo courtesy of Sage

When Cindy Taff was a vice president at the giant oil and gas company Shell in Houston, her middle schooler Brianna would sometimes look over her shoulder as she worked from home.

“Why are you still working in oil and gas?” her daughter asked more than once. “Is there a future in it? Why aren’t you moving into something clean?”

The words weighed on Taff.

“As a parent you want to give direction, and was I giving her the right direction?” she recalled.

At Shell, Taff was in charge of drilling wells and bringing them into production. She worked on oil and natural gas that's called unconventional in the industry, because the oil or natural gas is difficult to get out of the ground — it doesn't naturally gush out like in movies. It's a term often used for oily shale rock. Taff was somewhat unconventional for the industry, too. Her coworkers used to tease her for driving an efficient hybrid.

“You’re not helping oil and gas prices by driving a Prius," they'd say.

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EDITOR’S NOTE: This is part of an occasional series of personal stories from the energy transition — the change away from a fossil-fuel based world that largely causes climate change.

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Taff wanted Shell to pursue the energy that comes from the Earth's natural heat — geothermal. Her team looked into it, but Shell never greenlit any of those projects, saying it would take too much time to recoup the investment.

When Brianna went to college, she was passionate about energy too, but she wanted to work on renewables. After her sophomore year, in the summer of 2020, she got an internship at a geothermal company — one that in fact had just been launched by Taff's former colleagues at Shell — Sage Geosystems in Houston.

Now it was Taff looking over her daughter's shoulder and asking question as she worked from home during the pandemic.

And Sage executives were talking to Brianna, too. “We could use your mom here," they said. "Can you get her to come work for us?” Brianna recalled recently.

That's how Cindy Taff left her 36-year career at Shell to become chief operating officer at Sage.

“I didn't understand why Shell wasn't pursuing it,” she said about applying the company's drilling expertise to heat energy. "Then I got this great opportunity to pivot from oil and gas and work with these guys that I have the utmost respect for. And also, I wanted to make my daughter proud, quite frankly.”

Brianna Byrd, now 24, is the operations engineer and spokesperson at the company. She's glad her mother, now CEO, left oil and gas.

“Of course I’m biased, she’s my mom, but I don’t think Sage would be where it is without her,” she said.

The United States is a world leader in electricity made from geothermal energy, but this kind of electricity still accounts for less than half a percent of the nation’s total large-scale generation, according to the U.S. Energy Information Administration. In 2023, most geothermal electricity came from California, Nevada, Utah, Hawaii, Oregon, Idaho and New Mexico, where there are reservoirs of steam, or very hot water, close to the surface.

The Energy Department estimates this next generation of geothermal projects, like what Sage is doing, could provide some 90 gigawatts by 2050 — enough to power 65 million homes or more. That hinges on private investment, and on companies like Sage introducing this form of energy to regions where, until now, it’s been thought to be impossible.

How it works

Sage has two main technologies: The first makes electricity out of heat. The company drills wells and fractures hot, dry rock. Then electric pumps push water into those fractures, heating it up, and the hot water gets jettisoned to the surface where it spins a turbine.

But a funny thing happened during testing in Starr County, Texas. In late 2021, the team realized much of their technology could also be used to store energy.

If that works, it could be a big deal. Currently, to store energy at large scale, the United States is adding batteries, mostly lithium-ion type, to solar and wind projects, so they can charge up and send electricity back to the electric grid when the sun is not shining or the wind is not blowing. These batteries typically supply four hours maximum power.

Sage envisions some of its technology placed at solar and wind farms, too. When electricity demand is low, they'll use extra energy from a solar or wind farm to run electric pumps, pumping water into the underground fractures, leaving it there until demand for electricity increases — storing the energy beneath the Earth's surface for hours, days or even weeks.

It's a novel way to use the technology, said Silviu Livescu, lead author on a report looking at the future of geothermal in Texas. Livescu knows Taff and has followed the company's progress.

“It’s the right moment for companies like Sage with a purpose, with a mission and with the technology to show that geothermal indeed is the energy source we need to address climate change,” said Livescu, who co-founded a different geothermal startup in Austin, Texas.

These days, Taff is often out in front, talking with politicians and policymakers about the potential of geothermal. She attended the United Nations COP28 climate talks last year to share her vision for this kind of energy.

Sage has raised $30 million so far and is growing.

It's building a small (3-megawatt), geothermal energy storage system at San Miguel Electric Cooperative, Inc., south of San Antonio this year. It's working with U.S. military facilities in Texas that see geothermal as a way to power their bases securely. Sage recently announced partnerships for heating communities in Bucharest, Romania; clean electricity from geothermal for Meta's data centers, and energy storage and geothermal projects in California.

The company is final-testing a proprietary turbine to more efficiently convert heat to electricity.

Because of her oil and gas background, Taff said she knows geothermal will only be adopted widely if the cost comes down. The mantra at Sage is: It's going to be clean and it's going to be cheap. She's excited to be working in a field she feels is on the cusp of playing a big role in cleaning and stabilizing the electrical grid.

“I’ve never looked back,” she said. “I love what I’m doing and I think it’s going to be transformative.”

Trending News

A View From HETI

Lilium aims for the first piloted flight of the Lilium Jet to occur early in 2025. Photo via lilium.com

An aircraft that's being touted as the first fully electric jet is taking off from Hobby Airport to serve the greater Houston area.

Lilium Jet, which takes off and lands vertically, is making its United States market debut at Houston-area facilities – Houston Hobby Airport, Conroe North Houston Regional Airport, and The Woodlands Heliport Lilium. Houston-based aircraft brokerage EMCJET will house the Lilium Jet at its Galaxy FBO Houston-area facilities at the airports.

“We are excited to transform Galaxy FBO into a cutting-edge hub for the eVTOL innovation,” Jeremy Gee, CEO of Galaxy FBO, says in a news release. "As the future of electric aviation takes flight, this marks a significant step in making Houston a leader in sustainable and efficient transportation solutions. Our team is proud to support Lilium's revolutionary mode of travel that will connect Greater Houston in ways never thought possible."

The Lilium Jet is capable of quickly connecting routes like Houston Hobby Airport to Galveston, Houston Spaceport to College Station, The Woodlands to Galveston, and others. The jet is designed for regional travel with its aerodynamic shape. The ducted electric fans prioritize efficiency and speed during forward flight. The jet’s anticipated initial operating range is roughly 110 miles. Lilium aims for the first piloted flight of the Lilium Jet to occur early in 2025.

“Lilium is serious about expanding in the U.S. and actively progressing towards FAA validation,” Lilium’s Vice President of Commercial Americas Matthew Broffman says in a news release.” As part of our commitment to working with communities across the U.S. and expanding our customer base, we’re excited to showcase our aircraft for the first time in Houston, a city with a proud legacy of aerospace innovation in America.”

The Greater Houston Partnership will also host a discussion with industry leaders on how electric aviation can “revolutionize regional travel” according to a news release.

“Houston is home to the world’s leading aerospace companies, and we’re thrilled to welcome Lilium and this next generation of aviation technology,” says Kevin Tipton, senior director for aerospace and aviation at GHP in a news release. “Together, we’re on the brink of something groundbreaking for our region.”

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