Best Of 2013

U.S. Solar Market Grows 76% in 2012

<p> GTM Research and the Solar Energy Industries Association® (SEIA®) today released U.S. Solar Market Insight: Year-in-Review 2012, the definitive analysis of solar power markets in the U.S.</p> <p> With another record-breaking year, solar is the fastest growing energy source in the U.S., powering homes, businesses and utility grids across the nation. The Solar Market Insight annual edition shows the U.S. installed 3,313 megawatts (MW) of solar photovoltaics (PV) in 2012, a record for the industry. Perhaps most importantly, clean, reliable, affordable solar is continuing a major growth pattern that has made it a leading source of new electricity for America that&#39;s increasingly competitive with conventional electricity across dozens of states today.<br /> <br /> Even with the cost of solar falling for consumers, the market size of the U.S. solar industry grew 34 percent from $8.6 billion in 2011 to $11.5 billion in 2012&mdash;not counting billions of dollars in other economic benefits across states and communities. As of the end of 2012, there were 7,221 MW of PV and 546 MW of concentrating solar power (CSP) online in the U.S. -- enough to power 1.2 million homes.<br /> <br /> At the state level, 2012 was another year for breaking records. California became the first state to install over 1,000 MW in one year, with growth across all market segments. Arizona came in as the second largest market, led by large-scale utility installations, while New Jersey experienced growth in the state&#39;s non-residential market.<br /> <br /> In addition to record annual installations, the fourth quarter (Q4) of 2012 shattered all-time quarterly records as well, with 1,300 MW of installed PV, besting the previous high by a whopping 64 percent. The residential and utility segments had their best quarters ever, installing 144 MW and 874 MW respectively.<br /> &nbsp;</p>

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Cryogenic Energy Storage

<p> In 2005, Highview Power Storage began researching the possibility of utility scale energy storage using liquid air. Excess energy (during low-demand times) is used to compress air into a liquid, which can then be stored in insulated low-pressure tanks. When demand exceeds production, the liquid air is warmed and the resulting steam is used to drive the turbine of a generator.</p> <p> <br /> According to Highview, cryogenic energy storage offers the following benefits:</p> <p> <span style="font-size: 1em; line-height: 1.2em;">It uses proven technology that's been been around for years.</span></p> <p> <span style="font-size: 1em; line-height: 1.2em;">Regulations for cryogenic storage already exist.</span></p> <p> <span style="font-size: 1em; line-height: 1.2em;">Storage is at low pressure, making tanks less costly. (Tanks are insulated to keep the liquid air cold, but they're still less expensive than room-temperature compressed air storage tanks.)</span></p> <p> <span style="font-size: 1em; line-height: 1.2em;">Air doesn't explode and it's non-toxic.</span></p> <p> <span style="font-size: 1em; line-height: 1.2em;">Liquid air has four times the energy density of compressed air.</span></p> <p> <br /> During the storage process, ambient air is filtered to remove impurities. Water and CO2 are also removed because they'll freeze solid. The resulting air is refrigerated. Some of the air condenses into a liquid at -196oC. That liquid air is stored in tanks. The remaining unliquified air is very cold, so it's recycled and used to assist in the cooling process.</p> <p> During the recovery process, exhaust gas is added to heat the liquid air. When the liquid is gasified, it drives a steam engine that generates electricity. In the process of heating the liquid air, the exhaust gas is chilled to -160oC. The "cold" is stored in a gravel bed and later recovered to help the chilling process used during energy storage. This reduces the amount of work the compressor has to do, making the process more efficient. <a href="http://www.engineering.com/ElectronicsDesign/ElectronicsDesignArticles/ArticleID/5780/Cryogenic-Energy-Storage.aspx" target="_blank">Read Tom Lombardo&#39;s Full Article.</a></p>

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