Tag Archives: photovoltaic

Todd Woody/Green Inc. Blog: Samsung Enters Solar Deal in California

Seth Woody reports from the Green Inc. blog at the Times

Samsung, the Japanese conglomerate best known to Americans for its televisions and cellphones, is jumping into the American solar business.

Pacific Gas and Electric, the California utility serving much of the northern and central parts of the state, asked regulators last week to approve a series of 25-year contracts [pdf] for 130 megawatts’ worth of photovoltaic power plants to be built by Solar Project Solutions, a joint venture between Samsung America and ENCO Utility Services, a former subsidiary of the utility company Edison International.

Samsung’s first commercial solar plant in South Korea. Photo via Green Inc. blog at NYTimes.com

The deal is the latest of a spate of such agreements signed by California utilities as they take advantage of the increasing attractiveness of photovoltaic power as the price of solar modules falls and new competitors enter the market.

Unlike large solar thermal power plants that use mirrors to heat liquids to generate steam to run electricity-generating turbines, photovoltaic farms can be built relatively quickly near cities and existing transmission lines.

Todd Woody,–  Samsung Enters Solar Deal in California,

on the Green Inc. Blog (NYTimes.com)

Mr. Woody’s point about photovoltaic systems is well-taken: here’s another photovoltaic application, the Marine Corps’ recently announced GREENS system:

A year ago, U.S. Marines operating in the Arabian Desert only viewed the sun as the source of the region’s relentless heat. Recently, the Office of Naval Research (ONR) Advanced Power Generation Future Naval Capabilities program introduced technology that allows the Marines to harness some of that sunshine to help power their field equipment.

Fueled by the sun, the Ground Renewable Expeditionary ENergy System (GREENS) is a 300-watt, photovoltaic/battery system that provides continuous power to Marines in the field. ONR began exploring the GREENS idea in fall 2008 in response to a Marine Corps requirement from Iraq for an expeditionary renewable power system.

“It’s vitally important to have power in the battlefield especially these days in an irregular warfare environment,” said Marine Col. Thomas Williams, a senior officer at ONR.

Via Solar Daily.

Link to Solar Energy Powers Marines on Battlefield – media release from the Public Affairs/Corporate Communications Office, Office of Naval Research








Solar Installation in Austin, Texas: image by Larry D. Moore

PV installation at Applied Materials, Inc., Austin Texas, 2008. Image by Larry D. Moore via Wikimedia Commons.

PV installation at Applied Materials, Inc., Austin Texas, 2008. Image by Larry D. Moore via Wikimedia Commons.

Larry D. Moore gallery on WikiMedia Commons (including many images not related to energy).

Apart from its beauty – we suspect there’s more to this PV panel design than an attractive layout. An image of the array, comprised of a larger number of similarly or identically constructed setups, can be found after the jump.

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After Gutenberg: IBM claims to have developed most efficient solar cell technology

After Gutenberg reports in IBM Concentrator Photo Voltaic Cells that

IBM has managed to squeeze 230W of power on to a centimeter square of solar panel using concentrator photovoltaics. The energy was then converted to 70W of usable electric power, the best power efficiency yet achieved, the company claims.

Relying on a piece in EETimes, After Gutenberg, which routinely spots the details that matter, points out that this is a place where semiconductor and photovoltaic technologies overlap. After Gutenberg further quotes the EEtimes as follows:

The IBM researchers used a very thin layer of a liquid metal made of a gallium and indium compound that they applied between the chip and a cooling block. Such layers, called thermal interface layers, transfer the heat from the chip to the cooling block so that the chip temperature can be kept really low.

They suggest that if the silicon can be cooled effectively, concentrated photovoltaics could take over as the cheapest form of solar energy.

However, IBM admits there is much work to be done to move the research project from the lab to the fab.

By using a much lower number of photovoltaic cells in a solar farm and concentrating more light on to each cell using larger lenses, IBM’s system enables a significant cost advantage in terms of a lesser number of total components.

The researchers said that the concentration increases the power of the sun’s rays by a factor of ten, allowing cells that normally generate 20W of power to generate 200W instead.

Their initial results were presented at this week’s 33rd IEEE Photovoltaic Specialists conference , where the researchers showed how their liquid metal cooling interface is able to transfer heat from the solar cell to a copper cooling plate much more efficiently than anything else available today.

“We believe IBM can bring unique skills from our vast experience in semiconductors and nanotechnology to the important field of alternative energy research,” said Dr. Supratik Guha, the scientist leading photovoltaics activities at IBM Research. “This is one of many exploratory research projects incubating in our labs where we can drive big change for an entire industry while advancing the basic underlying science of solar cell technology.”

The researchers developed a system that achieved the “breakthrough” results by coupling a commercial solar cell to an IBM liquid metal thermal cooling system using methods developed for the semiconductor industry.

IBM adds that concentrator-based photovoltaics technologies have the potential to offer the lowest-cost solar electricity for large-scale power generation, “provided the temperature of the cells can be kept low, and cheap and efficient optics can be developed for concentrating the light to very high levels.”

John Walko, “IBM claims major boost in solar cell efficiency

,” in EETimes Europe.

Via the increasingly indispensable, and ever mysterious J.C.W. at After Gutenberg .