Sunday, September 25, 2011

Latest from: CleanTechnica

Latest from: CleanTechnica

Link to CleanTechnica

Geologically Active Japan as an Energy Resource

Posted: 25 Sep 2011 02:41 PM PDT

Only about 16% of Japan’s electricity is produced domestically, but Japan is located on the ring of fire and is rated as the third most geologically active country in the world. This threatens nuclear power with earthquakes, tsunamis, and volcanic eruptions, but is ideal for geothermal energy development. Japan Geothermal Developer's Council has announced that six Tohoku prefectures could develop a generating capacity of 170 MW and a total of 740 MW in those prefectures, if including sites in national parks, where geothermal plants are presently restricted.

The recent massive earthquake in Japan caused 6800 MW of electricity to go offline. It is estimated that conventional geothermal in Japan may have a combined capacity for 85,000 MW, more than enough to entirely replace its nuclear energy power plants.

Types of “Geothermal”

Conventional geothermal” energy development uses volcanically active areas of the Earth to produce steam for a conventionally operated thermal power plant (and uses the thermodynamic Rankine cycle). Both nuclear energy and geothermal energy currently have the highest capacity factor, around 90%, making them good sources of baseload power. CleanTechnica’s Andrew Burger says:

In contrast to fossil fuel electrical power plants, geothermal power plants produce no greenhouse gas emissions, and geothermal is a renewable resource. It's cost-effective, and in contrast to renewable energy resources, such as wind and solar that produce electricity on an intermittent basis, it provides a steady stream of electricity, or baseload power.

Geothermal energy can also be developed with the Organic Rankine Cycle (ORC) and can then operate at lower differences in temperatures. This is sometimes called “Dry Well Geothermal” because it is proposed for dry oil wells. This type only needs warmer underground temperatures and may use wells 2,000 to 3,000 feet deep. This type is available even in areas that are not volcanically active.

The last type of “geothermal” is used with heat pumps to tap the relatively constant ground temperatures for heating and cooling. This type might use ponds, 6′- to 10′-deep surface loops or wells 200 to 300′ deep. Our planet’s surface heat would be 20 to 30 degrees cooler if it were not for the sun heating the surface. To some extent, this type of “geothermal” is a solar application.

Geothermal in Japan

Japan is heavily dependent upon imports for most of its electrical needs. It is not surprising that nuclear energy was such an attractive option. Like solar and nuclear energy, geothermal has a high initial cost but much lower operating costs.

Mitsubishi Corp, Toshiba Corp and Fuji Electric are leaders in the geothermal equipment industry, supplying nearly 70 percent of all steam turbines and power gear at geothermal plants worldwide.


Geothermal Research Society of Japan provides an 80-year timeline of geothermal development in Japan, but there is only about 530 MW of geothermal energy presently developed. Presently, development is a long and complex process that can take 5 to 10 years. In part, this may be because geothermal energy is viewed as a natural resource that feeds their hot spring resorts (onsens) rather than primarily as a renewable energy resource.

As Japan begins to “…aim for a society that does not depend on nuclear power generation" by phasing out such energy "systematically and in stages" (- Japan’s Prime Minister Naoto Kan), geothermal seems like a great option for new electricity generation. Thus, it is not surprising that

…the government last June eased restrictions on development in national and quasi-national parks. Developers are now permitted to tap into geothermal resources underground if they drill diagonally into the ground from outside national and quasi-national parks, or take other steps to preserve the parks’ landscapes.

Careful legislationwill be required to continue to streamline the development process while maintaining the natural beauty of Japan.

Photo Credits:

  1. Ring of Fire: USGS
  2. how geothermal works: NREL via Union of Concerned Scientists
  3. energy graph: EIA
  4. Onsen (hot spa:) wiki commons

Small Wind Turbine Market Growing Strong in U.S.

Posted: 25 Sep 2011 07:17 AM PDT

The American Wind Energy Association (AWEA) is going to release a report on 2010 growth of the small wind turbine market soon, the AWEA 2010 U.S. Small Wind Turbine Market Report. I got to take a sneak peak at some of the data and charts and, with permission, am sharing a few key points and a couple graphs with you here on CleanTechnica. Check out the following and let us know what you think about the small wind turbine market and its strong growth.

small wind turbine sales capacity 2010Highlights:

  1. Small wind turbine market grew 26% in 2010 (in kW), more than any previous year.
  2. Nearly 8,000 small wind power systems were sold in 2010 for a record $139 million.
  3. Cumulative small wind turbine sales in the U.S. after 2010 bring U.S. capacity to  179 MW (from 144,000 units), nothing to laugh about.
  4. Fewer wind turbines were sold, but they apparently had a higher average capacity. (Average cost was $5,430/kW.)
  5. More of the sales were for grid-connected turbines than in previous years, representing 90% of sales for the first time ever.
  6. Sales come from over a dozen small wind turbine companies, including over a half-dozen U.S. companies. “Domestic sales by U.S. manufacturers accounted for an 83% share of the U.S. market; on a unit basis, U.S. manufacturers claimed 94% of domestic sales.”
  7. Turbines manufactured in the U.S. typically used 80% domestic content.
  8. 51 different wind turbines models were known to be sold.

More to come when AWEA releases the full report, but it seems clear that small wind turbines are growing in popularity and sales, and that they are creating jobs for numerous Americans today.

Images via AWEA


No comments:

Post a Comment