New Tectonic Source of Geothermal Energy?

Let our journalists help you make sense of the noise: Subscribe to the Mother Jones Daily newsletter and get a recap of news that matters.


volcan42.jpg Geochemists from the Lawrence Berkeley National Laboratory and Arizona State University have discovered a new tool for identifying potential geothermal energy resources. The discovery came from comparing helium isotopes in samples gathered from wells, springs, and vents across the northern Basin and Range of western North America. High helium ratios are common in volcanic regions. When the investigators found high ratios in places far from volcanism, they knew that hot fluids must be permeating Earth’s inner layers by other means. The samples collected on the surface gave the researchers a window into the structure of the rocks far below, with no need to drill.

“A good geothermal energy source has three basic requirements: a high thermal gradient—which means accessible hot rock—plus a rechargeable reservoir fluid, usually water, and finally, deep permeable pathways for the fluid to circulate through the hot rock,” says Mack Kennedy. “We believe we have found a way to map and quantify zones of permeability deep in the lower crust that result not from volcanic activity but from tectonic activity, the movement of pieces of the Earth’s crust.”

Geothermal is considered by many to be the best renewable energy source besides solar. Accessible geothermal energy in the United States, excluding Alaska and Hawaii, is estimated at 90 quadrillion kilowatt-hours, 3,000 times more than the country’s total annual energy consumption. Determining helium ratios from surface measurements is a practical way to locate promising sources.

Julia Whitty is Mother Jones’ environmental correspondent. You can read from her new book, The Fragile Edge, and other writings, here.

THIS IS BIG FOR US.

And we won't beat around the bush: Our fundraising drive to finish our current budget on June 30 and start our new fiscal year on July 1 is lagging behind where we need it to be.

If you value the reporting you get from Mother Jones and you can right now, please consider joining your fellow readers with a donation to help make it all possible. Whether you can pitch in $5 or $500, it all matters.

If you're new to Mother Jones or aren't yet sold on supporting our nonprofit reporting, please take a moment to read Monika Bauerlein's post about our priorities after these chaotic several years, and why this relatively quiet moment is also an urgent one for our democracy and Mother Jones’ bottom line—and if you find it compelling, please join us.

payment methods

THIS IS BIG FOR US.

And we won't beat around the bush: Our fundraising drive to finish our current budget on June 30 and start our new fiscal year on July 1 is lagging behind where we need it to be.

If you value the reporting you get from Mother Jones and you can right now, please consider joining your fellow readers with a donation to help make it all possible. Whether you can pitch in $5 or $500, it all matters.

If you're new to Mother Jones or aren't yet sold on supporting our nonprofit reporting, please take a moment to read Monika Bauerlein's post about our priorities after these chaotic several years, and why this relatively quiet moment is also an urgent one for our democracy and Mother Jones’ bottom line—and if you find it compelling, please join us.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate