Coal power supplies most of the electricity that we use here in America. It’s been that way for a long time. Because of coal’s popularity as a source of power, mines, both active and abandoned, lay scattered across the nation. And now, with coal’s popularity waning, the number of abandoned mines could increase. Since 2001 alone, 100 coal-fired plants have taken their turn in front of the firing squad.

And it doesn’t seem as though it’s over. If the trend of extinguishing coal-fired plants continues, more and more mines will be shut down, not to mention mines that simply up and quit. But what is to be done with the abandoned mines? It isn’t as though we can just dispose of them at some hi-tech facility. These mines will become useless scars.

Two engineers from the University of Oviedo have an idea, though. In their research, which is being published in the journal Renewable Energy, Rafael Rodríguez and his colleague María Belarmina Díaz claim that mine shafts on the point of being closed down could be used to provide geothermal energy to local towns.

Read more of this story »

There is enough energy stored beneath the earth’s surface to power all of our energy demands thousands of times over. The problem is, it’s thousands of feet beneath us. Out of sight. Out of mind. But what if we could get to it? What if we could harvest that power?

That’s the task at hand for Jared Potter. Jared Potter, CEO of Potter Drilling, is developing technology that his father, Robert Potter, initiated over 30 years ago while working at the Los Alamos National Laboratory. Robert Potter worked on developing Hot Dry Rock (HDR) heat mining, which, simply put, is a method of harvesting geothermal energy by pumping water into hot, crystalline rock via an injection well. The water is superheated as it flows through open joints in the hot rock reservoir, and is returned through production wells. At the surface, the useful heat is extracted by conventional processes, and the same water is recirculated to mine more heat.

Read more of this story »

In the heart of Tuscany the city of Grosseto has recently presented an important eco-building project, the first in Italy that will allow residents to forget completely house bills.

Read more of this story »

Pullen’s church expansion had to uphold the church’s tradition of cherishing the earth, so what better way to do so than by incorporating a green design? The desire to be “as green as can be” and still be affordable, is always a challenge faced by any homeowner or organization wanting to make ‘green’ renovations to their home. Pullen chose green design elements that allowed it to meet its goals within a healthy and comfortable structure that offers reduced maintenance and operation costs.

Read more of this story »

Harnessing the Earth’s Heat for Food and Power

As the rumbling temblors beneath Yellowstone National Park continue (over 900 hundred such weak quakes in 2008), media attention shifts to two topics: the possibility of a super-volcanic eruption (not likely, according to most geologists), and secondly, the harnessing of geothermal energy.

This latter consideration is all the more fashionable these days as America struggles to embrace an alternative and sustainable energy future.

Geothermal energy offers the promise of a virtually unlimited source of power. Although less energetic in terms  of total constant power output compared to the sun, harnessing the geothermal venting from a single, sufficiently high-grade, hot-spring could conceivably provide power for a population of tens of thousands, and it’s not weather dependent.  But there are also plenty of “lower grade” springs that can be put to other uses, such as growing hothouse produce (and the spring water is also used for watering the plants) and  naturally warming water for fish farming (the Talipia species, a popular dinner fish, is one species farmed this way). Not all animals that are farmed this way are used for food, some, like the farmed alligators in Mosca, CO (see photo), are raised for their skins primarily (though some do eat the meat).

Read more of this story »

Few decades ago the share of renewable energy in Nicaragua’s power generation was 70 percent but with growing ties with Venezuela and availability of cheap oil that number declined and now the country gets just 34 percent of its energy from renewable sources. But with the rising oil prices and increasing blackouts the government now seems to be falling back on the locally available and reliable renewable energy sources.

Having close diplomatic relations with Venezuela assured Nicaragua of sufficient oil supply for years but with oil peaking to $147 it became more and more difficult to shoulder the burden of rising energy costs. Although oil-based energy was cheaper than the energy produced from non-conventional sources, the fluctuation in oil prices started hurting the economy of the nation. The government of Nicaragua soon realised that oil-based energy sector is not sustainable in the given circumstances.

Nicaragua, one of the poorest countries in the western hemisphere, is blessed with a wide variety of renewable energy sources - wind, geothermal and hydel energy. The government is now looking to attarct foreign investors to help it develop projects which could eventually reduce the country’s dependence on oil for power generation to a mere 3 percent.

Russia, Iran and Brazil have come forward to invest in renewable energy projects in Nicaragua. A private capital firm, Arctas Capital Group, has invested in a $90 million wind energy project which will start generating 40 megawatts of energy from January. Nicaragua has six active volcanoes and therefore also experiences substantial amount of geothermal activity which it plans to tap through a 250 megawatt project to be build with the help of Russia.

For years the governments of Nicaragua ignored the vast reserves of renewable sources present in their country and increased their dependence on foreign oil as oil-based power plants were cheaper and easy to build but as the oil prices rose to unprecedented levels the already battered economy of Nicaragua seemed to give way. Now the government has set an ambitious but achievable goal of getting rid of costly foreign oil and building a predominantly renewable energy based economy. Other nations need to take the cue and look to utilize the locally available renewable energy sources as it would not only help build a cleaner environment but also build a stronger economy.

Image source: Conor Dupre-Neary at Flickr under Creative Commons License.

At a time when major U.S. companies are announcing job layoffs almost daily, the renewable energy industry is hiring new workers every day to build wind farms, install rooftop solar arrays, and build solar thermal and geothermal power plants. The output of industrial firms that manufacture the equipment for these energy facilities is expanding by well over 30 percent a year. These investments both create jobs and help prevent climate change from spiraling out of control.

Among the several sources of renewable energy, wind looms large. The United States has 24,000 megawatts of wind generating capacity already online (think 24 coal-fired power plants), and 83 wind farms with some 8,000 megawatts of capacity are under construction. Beyond this, a staggering 225,000 megawatts of planned wind farms are waiting for access to transmission lines.

Currently, the United States has 40 plants manufacturing wind power components. Eight of these plants are assembling wind turbines, 20 are fabricating wind towers, and 12 are making blades. In addition, many more manufacturing facilities are under construction, recently announced, and in planning. Every billion dollars invested in wind farms creates some 3,350 jobs—nearly four times the 870 jobs created with a similar investment in coal-fired power plants. (See data.)

Read more of this story »

In her home country, Iceland, thermal energy from the volcanic system that makes Iceland one of the youngest countries in the world has also created a thriving industry in aluminium smelting. The three largest smelters in Europe are sited there, and Alcoa and Rio Tinto both have substantial investments in the Icelandic economy.

Read more of this story »

Raser Technologies announced this week that it has completed construction of a plant on top of one of the United States’ largest geothermal hotbeds to be discovered in over 25 years—so large that Raser believes it could power one third of all homes in Utah.

Read more of this story »

The lands that will be opened are in Alaska and 11 western states. It is believed that the geothermal energy in time could provide electricity to 5.5 million homes.

Read more of this story »

Despite its recent foray into sustainable practices, the United States Army isn’t known as an environmental leader. Now the Army is trying to prove its greenness with the world’s strongest solar array. Yesterday, the Army announced that it plans to construct a 500 MW solar thermal plant in the Mojave Desert at Fort Irwin. Currently, the United States’ largest solar array is a 15 MW plant at Nellis Air Force Base outside Las Vegas.

Read more of this story »

Last week, the Dutch city of Heerlen opened the world’s first geothermal power station that uses water heated in old coalmine shafts. The power station works by pumping water up from 800 meters deep in the mines. At that depth, the water reaches a temperature of 35 C (95 F). It heats 350 homes and is pumped back into the mines after use, where it recirculates two to three times a year.

Read more of this story »

And it looks like Google made a wise investment choice. According to an MIT report on EGS, only 2% of the heat beneath the continental US between 3 and 10 kilometers (depths we can reach with current technology) is more than 2,500 the annual energy use of the United States.

While traditional geothermal energy relies on finding natural pockets of hot water and steam, EGS fractures the hot rock, circulates water in its system, and uses the steam created from the process to create electricity in a turbine.

Read more of this story »

Since Klamath Falls, the home of Oregon Tech, sits near a fault line, heat and energy can be easily taken out of the earth.

And Oregon Tech isn’t the only institution to take advantage of the abundant geothermal energy in the area.

Read more of this story »

After six years of research, Raser Technologies will deliver geothermal energy to the city of Anaheim, California. The geothermal generator, which is located in Beaver County, Utah, will produce 10 megawatts of energy, or enough to power 9,000 homes. It should be completed by October. Anaheim’s new energy source will put it on the fast track to reaching 20 percent of its total energy needs through renewable energy by 2012.

The Raser geothermal model is much more consumer-friendly than previous models, as it operates at the relatively low temperature of 165 F. And a lot is riding on its success. According to Merrill Lynch’s managing director of corporate finance Roy Piskadlo, “The success of this project will be important, because with this new low-temperature technology, the range of potential commercial sites is much wider.”

Read more of this story »

This week, from March 3-10, we’ll be examining renewable energy around the world.

African American community leader Bertha Calloway once said, “we cannot direct the wind, but we can adjust the sails.”

Likewise, we cannot direct the sun, the tides, or ground energy; and these are only a few of the many options for clean, renewable energy.

However, by adjusting our sails we can benefit from energy from all of these untamable forces of nature.

Read more of this story »