The
latest form of insanity
Are
Volcanos the New Source of Geothermal Energy?
Scientists
pursue volcanos for renewable energy, enormous potential for returns
7
August, 2012
Here's
a scary thought: scientists are testing the idea of pumping water
into the sides of a dormant volcano in Oregon at pressures great
enough to evoke small earthquakes. Why? Apparently, the boiling
bowels beneath our feet hold tremendous promise for geothermal
energy.
According
to a report MIT submitted to the Department of Energy, two percent of
the heat some six miles below the ground could provide 2,500 times as
much energy as the country currently uses. By employing a technique
called Enhanced Geothermal Systems (EGS), several million gallons of
water are blasted at high pressures through artificial wells over
10,000 feet deep. When the water reaches the hot rocks, it returns to
the surface through a second well as scalding hot water, where its
heat can then be harvested for power.
Backed
by the DOE, Google and others, AltaRock Energy and Davenport Newberry
Holdings have been exploring ways to tap geothermal energy from the
Pacific Northwest volcano, and will put their knowledge to the test
this summer at Oregon's Newberry Volcano.
"We
know the heat is there," Susan Petty, president of AltaRock,
told the Huffington Post. "The big issue is can we circulate
enough water through the system to make it economic."
Over
the last century, engineers have been tapping the heat in the earth's
crust for power by gathering hot water or steam bubbling near the
surface to spin turbines that create electricity. Places with hot
rocks lacking cracks or water to deliver the stream is the new
frontier. That's where EGS comes into play.
“Hydrofracking”
versus “Hydroshearing”
By
drilling deep into the rocks where water is then pumped in, steam can
be drawn out, a process known as hydroshearing. Though it sounds
similar to hydrofracking, scientists claim that the technique used in
this scenario is entirely different, which will not pollute
groundwater with toxic chemicals.
But
what about triggering earthquakes? The effects of pumping the water
deep into the ground will be measured using sensors that will provide
microseismicity data to scientists to ensure that the water is
getting the right exposure and not triggering seismic activity.
Fracking, on the hand, pumps wastewater deep underground, which has
likely led to recent earthquakes in Arkansas and Ohio.
The
team working on the project will be closely monitoring earthquake
activity around sites like Newberry. Furthermore, a new international
protocol came out earlier this year urging EGS developers to keep
projects out of urban areas, while being upfront with local residents
so they know what is going on.
The
prospect of a major quake at Newberry is very low, according to Ernie
Majer, a seismologist at the Lawrence Berkeley National Laboratory.
No significant faults exist in the area and it is far enough from
population centers to make damages highly unlikely. The layers of
volcanic ash built up over the millennia hinder any shaking.
"That's
the $64,000 question," Majer said to the Huffington Post.
"What's the biggest earthquake we can have from induced
seismicity that the public can worry about."
Still,
EGS is attractive, because unlike wind and solar, geothermal power is
not dependent on weather conditions and it could significantly expand
the potential of clean energy in the US. Although natural geothermal
resources only account for about 0.3 percent of total US electricity
production, MIT predicts that EGS could bump that number up to 10
percent within the next 50 years at prices competitive with
fossil-fuels.
From
there, the potential is even greater. Throughout the West, where hot
rocks are especially close to the surface, geothermal could provide
half the country's electricity, according to a 2008 USGS assessment.
"The
important question we need to answer now," said Colin Williams,
the USGS geophysicist who compiled the assessment, "is how
geothermal fits into the renewable energy picture, and how EGS fits.
How much it is going to cost, and how much is available."
desperation hand in hand with insanity?
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