popular logistics

Dig 5 km, hit 200º C. Watch out for earthquakes! Actually, it’s a bit more complicated.  You dig two holes, each 5 km (3 miles) deep.  You lay a pipe in each hole, then pump water down into one hole, and up the other. The water heats up, and can turn a turbine. 

Geothermal for heat is old news. Teams at Virginia Tech and Johns Hopkins are studying at Deep Geothermal for space heating at Crisfield (click here) and at the Institute of Geophysics ETH, in Zurich, Switzerland (click here).

Deep Geothermal could, theoretically, use the earth’s heat to generate steam for industrial process power. But is this feasible? What is the temperature at the bottom of a coal mine or an empty oil well? How hot is it down there? With what efficiency, if any, can this differential be tapped to boil water to create steam to turn a turbine to generate power? How deep a hole do we need to drill? What are the potentially harmful side effects?

According to New Energy News, Article

Deep Geothermal is potentially the cheapest and most consistent, predictable form of renewable energy. The geothermal sources being probed are 400 degrees Fahrenheit and 3 miles into the earth’s crust (not the 1000 degree heat of the earth’s core). A scientist compared it to scratching the earth’s “shell.” Geodynamics Limited and Geothermal Basel (English) are racing to be the first to produce electricity in commercial quantities from the deep hot waters. When drilling reaches the deep enough, cold surface water will be pumped down to lift the hot water up where its steam will drive generators.

The Geopower Basel project is being drilled near Basel, Switzerland. Geodynamics Limited, Queensland-based, is drilling near the southern Australian town of Innamincka. Who will finish first?

Spencer Reiss, writing in Wired Magazine says “Nuclear Power is The Most Climate Friendly Insdustrial Scale Form of Energy“. Forgetting for a moment that nuclear power requires fuel, waste management, national security infrastructure, massive government subsidies, including artificial limits to liability, nuclear releases tremendous amounts of heat into the environment, and new nuclear are estimated to cost about 2 to 4 times the price of new wind facilities, without cost overruns (and cost overruns are a given with nuclear power plants) and take 10 to 12 years.

The climate friendly industrial scale forms of energy are Solar, Offshore Wind, large scale Marine Kinetic - tapping the Gulf Stream, Deep Geothermal, CoGen, and the NegaWatts available via conservation. Just as a screw can propel a ship thru the water, a screw anchored to the ocean floor will spin because of currents, and can power turbines. Marine Current Turbines, Ltd., based in Bristol, England has just completed the world’s first megawatt scale tidal/marine current driven power plant in the Strangford Narrows in Northern Ireland. If with wind, the sky’s literally the limit, with MCT the sea’s the limit. Geothermal exploits temperature differentials for heating and cooling. Deep Geothermal would use the earth’s heat in abandoned mines and wells to generate steam for industrial process power. Recycled Energy Development, RED, of Westmont, Il does CoGen. RED captures industrial waste energy to produce electricity and thermal power, often without burning any additional fuel or emitting any additional pollution. For industrial partners, RED reduces energy costs substantially, increases reliability, and offers the opportunity for emissions credits. Akeena, Evergreen Solar, First Solar, Sunpower, World Water and Solar, and Vestas Wind are old news. Ausra develops and deploys utility-scale solar thermal technologies to serve global electricity needs in a dependable, market competitive, environmentally responsible manner.

Wired Magazine also published a companion piece by Matt Power that says “Pound for pound, making a Prius contributes more carbon to the atmosphere than making a Hummer” (click here). The fallacy here is that they forget to mention that a Hummer weighs about three times more than a Prius, so to have an honest statistic you need to compare 3 pounds of Hummer to each pound of Prius. They do note that the operating efficiency of the Prius outweighs any manufacturing inefficiency. And they point out that it is better for the planet to buy a used car than a new car.