The Salt Lake Tribune reports that low temperature geothermal power company Raser Technologies is branching out into a new market - electric vehicles - and making some ambitious claims about a 100 mpg vehicle available in 2011 - Utah company to unveil new electric-powered truck/SUV.

How does an auto innovator generate enthusiasm among environmentalists for a massive truck or SUV that drinks gasoline like a thirsty camel?

One way is to replace the eight-cylinder power plant with a powerful electric motor assisted by a fuel-sipping four-cylinder engine that makes electricity for the vehicle if its batteries run low.

Raser Technologies, the Provo-based geothermal power development company, will unveil such a vehicle at the Society of Automotive Engineers World Congress, which meets in Detroit later this month.

Raser won't say what the prototype vehicle is until the conference begins. The company's Web site shows it as a Hummer H3. But an artist's drawing suggests the vehicle may be a full-size pickup.

Whatever it is, Raser's claims for the vehicle are jaw-dropping. In its all-electric mode, the vehicle runs up to 40 miles before its three lithium-ion batteries must be recharged. If the truck or SUV goes farther than 40 miles, it makes its own electricity, allowing the vehicle to travel up to 400 miles. Top speed is 100 miles an hour.

A turbine powered by the four-cylinder engine makes the electricity to recharge the batteries while the vehicle is moving. With the engine operating, the vehicle is said to get more than 100 miles per gallon, while emitting few pollutants. To recharge the vehicle overnight, a power cord is simply plugged in.

"Our power train makes a pickup truck greener than a Prius," David West, vice president of marketing at Raser, said Thursday.

Raser isn't an obscure company with outsized ideas and few credentials. Last month, the company began transmitting electricity generated at its new geothermal plant in Millard County to the city of Anaheim in Southern California. It is also developing new geothermal projects in Nevada, New Mexico and Oregon.

It began developing hybrid electric vehicles in 2003, hoping the Army could be persuaded to install electric power trains in their Hummers. With the war in Iraq absorbing most of its budget, the Army lost interest, even though electric motors are more efficient than diesel or gasoline engines and can be as muscular.

Despite the setback, the experience wasn't a waste of time. West said Raser was able to advance its technology to a point that, two years later, the company formed a consortium of technology companies to develop hybrid electric vehicles further. Its partners included Pacific Gas and Electric Co., Southern California Edison and Austin Energy in Texas. They focused on big vehicles because American consumers prefer pickups and SUVs, West said.

Last year, Pacific Gas and Electric said it would buy two hybrid SUVs from Raser. PG&E thinks the vehicles may solve a problem bedeviling most electric utilities. The company envisions a time when thousands of hybrid vehicles are being recharged overnight, soaking up energy when power plants have plenty of capacity that isn't being used.

"Plug-in hybrid electric vehicles are a practical solution to meet the challenges associated with climate change by reducing fuel costs, greenhouse gas emissions and our dependency on petroleum-based fuels," Andrew Tang, senior director of smart energy at PG&E, said at the time.

West said the Raser vehicle will undergo a series of field tests after the conference. Vehicles could be available in showrooms by 2011, if the technology pans out.

The Seattle Times has a report on the rapid development of geothermal power (paticularly low temperature geothermal power) in the US - Utah startup hits geothermal jackpot.

Within six months of discovering a massive geothermal field, a small Utah company had erected and fired up a power plant - just one example of the speed with which companies are capitalizing on state mandates for alternative energy.

Anticipation of new energy policies has sparked a rush on land leases as companies like Raser Technologies Inc., based in Provo, lock up property that hold geothermal fields and potentially huge profits.

Raser's find, about 155 miles southwest of Provo, could eventually power 200,000 homes. The company said it will begin routing electricity to Anaheim, Calif. within weeks. Earlier this month, California adopted the nation's most sweeping plan to cut greenhouse gas emissions.

"We made a pleasant discovery, let's put it that way," said Brent M. Cook, the company's chief executive.

The number of government land leases and drilling permits have risen quickly, said Kermit Witherbee, who heads up the leasing program for the U.S. Bureau of Land Management, with more than two dozen companies now trying to make a score like Raser.

Two years ago, the U.S. Bureau of Land Management approved 18 geothermal drilling permits. That number more than doubled in 2007 and has nearly quadrupled this year. The government leased a staggering 244,000 acres for geothermal development in the past 18 months. Another 146,339 acres went up for bid Friday in Utah, Oregon and Idaho. All of it was claimed.

Raser's find "has the potential to become one of the more important geothermal energy developments of the last quarter century," said Greg Nash, a professor of geothermal exploration at the University of Utah.

The company quickly redrew its business plan, bumping up its planned development of 10 megawatts of power to 230 megawatts. That is in line with the field's power potential according to calculations by GeothermEX Inc., a consulting firm.

By comparison, the largest group of geothermal plants in the world are The Geysers, about 60 miles northeast of San Francisco. The Geysers geothermal basin produces about 900 megawatts of energy, enough to power the city, said Ann Robertson-Tait, a senior geologist and vice president of business development for GeothermEX. ...

Raser and its supplier, UTC Power, plan to build another seven geothermal energy plants across the western United States by the end of 2009 and 10 plants a year for the next decade.

The push for geothermal power has been accelerated by state mandates like those in California, which this month said utilities must obtain a third of their electricity from renewable sources by 2020.

Raser, which specializes in low-boil geothermal sites, started buying leases five years ago on hundreds of thousands of acres that had been passed over because of their lower heat potential.

New technology, however, has made low-boil water useable for geothermal power. Raser buys 250-kilowatt power units from UTC Power, a subsidiary of United Technologies Corp.

Geothermal is also being used on a smaller scale. "These things are slot machines. They make money," said Bernie Karl, owner of Chena Hot Springs Resort, off the grid 60 miles northeast of Fairbanks, Alaska. On geothermal energy from early UTC prototypes, Karl powers light bulbs, heats lodges and rooms for 210 guests, warms a greenhouse that grows food and spices, keeps an ice house frozen and makes hydrogen for resort vehicles.

Raser hit hot water at a few thousand feet below the surface circulating inside a zone of porous limestone a mile deep. The underground "lake" cycles hot water endlessly under the power of the Earth's internal heat like a steam engine, throwing up loops of hot water intersected by wells that return it to the system.

The company holds rights to 78 square miles of land in the area and believes it has barely tapped the full potential.

The ABC recently had a report on plans to power north-west Queensland with low temperature geothermal power using hot water from the Great Artesian Basin.

A Brisbane-based company says it could supply geothermal power to all of north-west Queensland. Clean Energy Australasia wants to build a $50 million geothermal power station near Longreach. But it has now also revealed plans to build a pilot geothermal project near BHP's Cannington mine at McKinlay, south of Cloncurry. The company's Joe Reichman says the Mount Isa region needs about 500 megawatts of power a year and geothermal resources could easily provide that. "It'll change the region into a powerhouse," he said. Mr Reichman says the company has applied for federal and state government grants and has support from the major mining companies in the region. If the projects proceed they would be the first geothermal power plants in Australia.

Low temperature geothermal power is a relatively new (and very low profile) form of extracting energy from geothermal sources that provides yet another option for meeting our energy needs cleanly and sustainably.

Low Temperature Geothermal Power

When geothermal power is mentioned, people usually think of traditional high temperature geothermal power stations using water from volcanic areas, such as those found in Iceland, New Zealand, the US and elsewhere around the ring of fire.

More recently, interest in enhanced / engineered geothermal systems (EGS) - also known as hot dry rock (HDR) or hot fractured rock (HFR) geothermal power - has been high, with a number of experimental projects underway in Australia and Europe.

Low temperature geothermal power is also starting to attract significant interest, as lower temperature water resources are common in many countries (for example, waste hot water produced by oil and gas wells - in Texas alone, more than 12 billon barrels are produced, with oil companies usually re-injecting the waste water into the earth) and new technologies are beginning to appear that allow these resources to be developed commercially.

UTC Power has developed a low-cost Rankine cycle system that can convert temperatures as low as 195 °F (91 °C) into electricity. The technology is similar to a steam engine, with steam or hot water vaporizes a hydrofluorocarbon refrigerant that drives the turbine (it has been compared to a "refrigerator compressor running backwards").

Geothermal Power In The Great Artesian Basin

The Great Artesian Basin provides the only reliable source of water through much of inland Australia. The basin is the largest and deepest artesian basin in the world, covering a total of 1,711,000 square km. It underlies 23% of the continent, including most of Queensland, the south-east corner of the Northern Territory, the north-east part of South Australia, and northern New South Wales. The basin is 3000 metres (10,000 ft) deep in places and is estimated to contain 64,900 cubic kilometres of groundwater.

Most recharge water enters the rock formations from relatively high ground near the eastern edge of the basin (in Queensland and New South Wales) and very gradually flows towards the south and west. Because the sandstones are permeable, water gradually makes its way through the pores between the sand grains, flowing at a rate of one to five metres per year. Discharge water eventually exits through a number of springs and seeps, mostly in the southern part of the basin. It takes up to two million years for water to travel to the springs in the Lake Eyre area.



Temperatures of the artesian groundwater (which is generally of a very good quality) range from 30o to 100o C at the well heads. As the groundwater is too hot for town water supply and for stock to drink, it needs to be cooled down before consumption. That is why cooling towers can be seen throughout the region.

The ABC report's claim that the Longreach plant would be Australia's first geothermal power plant is incorrect.

A small (120 kW) power station (pdf) has been in operation at Birdsville in western Queensland since the early 1990's - one of the few low-temperature geothermal power stations in the world. The plant derives its energy from the near-boiling (98 degrees C) water taken from the Great Artesian Basin (at a depth of 1230m) that provides a water supply for the town. Operation of this geothermal power station reduced the town's diesel consumption by about 160,000 litres per year.



The Victorian town of Portland (in the Otway Basin) also operated a district heating scheme using water from geothermal sources for about 20 years, though this did not generate power.

Geothermal Power In The United States

The UTC plant has been trialled at the Chena Hot Springs in Alaska, with the first plant going online in July 2006. A second unit began operating later that year. Together, the two power units are contributing to the resort owner's goal of making Chena the first totally renewably powered and fueled community in the United States. The Chena experience is motivating other cities in Alaska, including Anchorage to investigate setting up larger scale geothermal plants.

UTC installed more production systems at another location in New Mexico in August this year.

Utah company Raser Technologies is looking to build a range of geothermal power plants throughout the western United States using Rankine cycle systems, with their first plant going live in Utah earlier this month.

Some oil fields also produce hot water which can be used to drive Rankine cycle power plants, with trials being performed in Wyoming.

Geothermal Power In Germany

Germany is interested in deriving significant amounts of energy from both EGS / HFR and low temperature geothermal sources. There are already four small geothermal power plants successfully operating in Germany, albeit supplying only a tiny amount of electricity.

The first geothermal plant to start operating in Germany is situated in Neustadt-Glewe in the north-eastern part of the country. The 230-kW combined electricity and heat power plant started up in 2003 and extracts water with a temperature of 97 °C from a well 2250 meters under the ground. It supplies 1,300 households with heat and a further 500 households with electricity.

Other plants now operating are the 3.5-MW plant at Unterhaching close to Munich, in Bavaria which is the first geothermal plant in Germany to use Kalina cycle technology. At that plant water is extracted at a temperature of 122 °C from a well 3,500 meters deep. Another 2.5-MW plant in Landau taps water of 150°C that is located 3,000 meters beneath the ground. Another 550-kW plant is due to go into operation in Bruchsal shortly, extracting water at temperatures of 128°C from a well 2500 meters deep.

More plants (as big as 8-10 MW) are due to go into operation in 2009-2010 in Sauerlach, Dürrnhaar, Riedstadt, Speyer, Gross Schoenebeck and Mauerstetten. By 2015 there could be more than a hundred plants operating - around 150 geothermal power plant projects are in the pipeline according to the German government. One major constraint on expanding the program has been shortages of drilling equipment.

Geothermal Power In New Zealand

While New Zealand already generates a significant portion of its power using traditional geothermal sources, the country is also conducting a NZ$2.6 million research program into low temperature geothermal power.

Conclusion

Low temperature geothermal power has the advantage of being clean, continuously available energy that can be generated in a wide variety of locations.

Plants will likely to continue to be relatively small-scale, making it a classic distributed energy generation alternative (like biogas and solar PV), with growth probably remaining low profile for some time.

In the long run, I expect we'll see a useful and significant amount of our energy needs being produced using this technology.

Cross posted from Our Clean Energy Future.