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A switch to wind energy will help reduce greenhouse gas emissions – and reduce the global warming they cause. But there’s a catch, says climate researcher Diandong Ren, a research scientist at the University of Texas at Austin in a paper appear in the AIP’s Journal of Renewable and Sustainable Energy: rising temperatures decrease wind speeds, making for less power bang for the wind turbine buck.

The prevailing winds in the “free” atmosphere about 1,000 meters above the ground are maintained by a temperature gradient that decreases toward the poles. “For example, Wichita, Kansas is cooler, in general, than Austin, Texas,” Ren says. “The stronger the temperature contrast, the stronger the wind.”

But as the climate changes and global temperatures rise, the temperature contrast between the lower latitudes and the poles decreases slightly, because polar regions tend to warm up faster. And as that temperature contrast becomes weaker, so too do the winds.

Wind turbines are powered by winds at lower altitudes – about 100 meters above the ground – where, Ren says, “frictional effects from local topography and landscapes further influence wind speed and direction. In

“my study, I assume that these effects are constant – like a constant filter – so wind speed changes in the free atmosphere are representative of that in the frictional layer.”

Ren calculates that a 2-4 degree Celsius increase in temperatures in Earth’s mid to high-latitudes would result in a 4-12 percent decrease in wind speeds in certain high northern latitudes.

This means, he says, that with “everything else being the same, we need to invest in more wind turbines to gain the same amount of energy. Wind energy will still be plentiful and wind energy still profitable, but we need to tap the energy source earlier” – before there is less to tap.

The article, “Effects of global warming on wind energy availability” by Diandong Ren appears in the Journal of Renewable and Sustainable Energy.

Source – winddaily.com

solar park

The World Bank’s Clean Technology Fund plans to invest $85 million in renewable energy and co-generation projects in South Africa.

The fund said it had $50 million available for wind and solar renewable energy projects and $35 million for co-generation, where waste energy and gases are used to produce power according to an advert in the Business Day.

The $85 million was part of a total $150 million allocated for investment in South Africa, with the remainder being managed by the African Development Bank.

South Africa’s state-owned power utility Eskom has said it will conduct more research in clean technology as it seeks a new World Bank loan to finance renewable energy power projects.

The World Bank in April approved a controversial $3,75 billion Eskom loan to develop a coal-fired power plant in South Africa despite the lack of support from the country’s key Western allies.

Source – The Times

Wind turbines china

The world’s top polluter, China, is a surprise leader in clean energy efforts, a study showed Tuesday, outstripping the United States and Japan and leaving Australia lagging far behind.


Wind turbines china

A wind turbine complex on the Zhemo Mountain on the outskirts of Dali in China's southwestern province of Yunnan. AFP PHOTO / FILES / LIU Jin

The Vivid Economics report, commissioned by Australia’s Climate Institute thinktank, showed China was second only to Britain in the value of its incentives to cut pollution from electricity generation.

Britain’s efforts were estimated at 29.30 US dollars per tonne of carbon to China’s 14.20 US dollars, with the United States clocking 5.10, Japan 3.10, Australia 1.70 and just 70 US cents for South Korea.

The six countries account for just under half of all global emissions.

“The Chinese leadership have made a strategic decision that they missed out on the last two industrial revolutions and they don’t want to miss out on the third one,” said Erwin Jackson, director of the Climate Institute, of China’s “surprising” dominance.

“They are now commanding the largest market share of clean energy investment at a global level as a result,” Jackson told AFP.

China’s investment in clean energy topped 35 billion US dollars in 2009 compared with 11 billion in Britain and 18 billion in the United States, and Jackson said it was set to increase tenfold over the next decade.

The main driver of China’s performance was its commitment to shutting down more than 100 small coal-fired power plants for cleaner coal stations by 2011, which the report said would reduce emissions by 15 percent.

It also offered subsidies worth billions of yuan for green energy projects, aiming to generate 15 percent of the nation’s total energy from renewable sources by 2020.

In Japan, 10 major power producers had joined a voluntary scheme aiming to cut emissions by 20 percent of 1990 levels by 2012, a major initiative which accounted for more than half of its clean energy rating.

Variations of an emissions cap-and-trade system were in place in South Korea, Britain, Tokyo, and parts of the United States, the report said.

The study said there were few policies which applied directly to coal, despite the fact it was the major source of fuel and carbon pollution for the six countries.

It also warned that none of the countries was on track to meet reduction targets agreed after last year’s global climate summit at Copenhagen, with Japan lagging worst in relative terms.

Jackson said the report showed that Europe and China were ahead of the game on pollution reduction investment, far outpacing countries such as Australia — the world’s worst per capita polluter due to its heavy dependence on coal.

Without action to price carbon, he said Australia risked falling foul of anti-pollution taxes, with countries such as Japan and India already taxing imports of coal and similar moves foreshadowed in the United States and Europe.

Australian Climate Change Minister Greg Combet welcomed the report, saying a carbon price “will not only provide an incentive to reduce pollution but also … drive this country’s long-term competitiveness”.

The ruling Labor party in Australia, the world’s largest coal exporter, has shelved emissions trading laws after failing to pass them and nearly lost power at August polls, with the eco-minded Greens party winning a record vote share.

Prime Minister Julia Gillard, now at the head of a Greens-backed coalition government, has urged penalties for carbon pollution and formed a cross-party committee to investigate the best way to slash emissions.

Source – The Times

offshore wind farm

disclaimer: image is for illustration purposes only

Google has agreed to invest, along with other partners, in a massive offshore wind power project along the U.S. Mid-Atlantic region.

The Atlantic Wind Connection “backbone” deep-water cable transmission project, led by Trans-Elect, is expected to provide approximately 6,000 megawatts of offshore wind capacity, enough power to serve 1.9 million households, when fully complete.

Other investors include Good Energies, a global investor in renewable energy, and Japan’s Marubeni Corp.

Instead of requiring multiple connections, the transmission line will serve as a “superhighway with on-ramps for wind farms,” said Rick Needham, director of green business operations at Google, the Philadelphia Inquirer reports. It will link to land at four locations: North Jersey, South Jersey near Atlantic City, the coast of Delaware and the coast of Virginia south of Norfolk.

The transmission line would run about 15 to 20 miles offshore. That’s up to 17 miles further out than the controversial Cape Wind project off the coast of Massachusetts, which has encountered fierce local opposition on aesthetic and environmental grounds.

AWC developers say that the turbines — with 295-foot hubs and 197-foot blade lengths — would barely be visible from beaches and residences, National Geographic News reports.

The system could also be expanded to accommodate additional offshore wind energy as the industry further develops.

AWC would involve high-voltage direct current instead of the high-voltage alternating current typical of most wind farms. Trans-Elect says HVDC cables are cheaper, have lower energy loss and use less copper than HVAC cables.

“The AWC backbone will both relieve transmission congestion in one of the nation’s most restricted power markets as well as enable the development of a huge offshore wind capacity that can bring stability and security to the Eastern Power Grid,” John Breckenridge, managing director at Good Energies, said in a news release.

Construction of the project is expected to begin in 2013, after the necessary permits are obtained and completion of an environmental review process.

“This can dramatically accelerate development of renewable energy,” Needham said. “This is in line with our commitment to a clean energy future, where we believe that being good environmental stewards makes good business sense.”

In May, Google made its first direct investment in clean energy, when it bought a $38.8 million stake in two North Dakota wind farms.

Pointing out that AWC is still in its early stages, Needham said “we’re willing to take calculated risks on large-scale projects that can move an industry.”

Google is to provide 37.5 percent of the equity for the initial development. While none of the investors would provide dollar amounts, The New York Times reported that Google’s initial investment in the project would be $200 million.

Source – Winddaily.com

wind power

wind powerWind power could meet about a fifth of the world’s electricity demand within 20 years, an industry group and environmental watchdog Greenpeace predicted in a new report released Tuesday.

The global market for wind power grew 41.7 percent on year in 2009, beating average annual growth of 28.6 percent over the past 13 years, said Steve Sawyer, secretary general of the Global Wind Energy Council, or GWEC.

China ranked second in the world in installed wind generating capacity in 2009 and was the largest buyer of wind technology, Sawyer told reporters at the launch of GWEC and Greenpeace’s Global Wind Energy Outlook 2010 report.

“We would expect China to continue to be the largest market and perhaps even be the (overall) largest market in the world by the end of this year,” he said.

The report’s “advanced scenario” — its most optimistic outlook — projects the world’s combined installed wind turbines would produce 2,600 terawatt hours (TWh) of electricity by 2020 — equal to 11.5 to 12.3 percent of power demand.

By 2030, wind energy would produce 5,400 TWh — 18.8 to 21.8 percent of the world’s power supply, the report said.

The more conservative “reference” scenario based on figures from the UN’s International Energy Agency saw wind power triple in the next decade to cover up to 4.8 percent of electricity — equal to Europe’s current total production.

The “moderate” scenario based on current industry figures would see wind power meet up to 9.5 percent of the world’s power demand by 2020, the report said.

“For more than the last 10 years, the actual performance of the wind industry has exceeded our advanced scenario every time,” said Sawyer.

Under the advanced forecast, 1.6 billion tonnes of carbon dioxide emissions would be saved each year, the report said.

This would increase to 3.3 billion tonnes of CO2 saved each year by 2030.

The cumulative amounts of CO2 saved would be 10 billion tonnes by 2020 and 34 billion tonnes by 2030, the report said.

When asked to compare China’s wind power industry to the US, Sawyer said Beijing was showing more leadership than Washington in alternative energy.

“At the moment, the Chinese market has most of the advantages in the sense that there’s a clear and supportive policy framework and very clear government support for developing a domestic industry,” Sawyer said.

“Neither of those have really been the case in the United States.”

Source – www.winddaily.com

windmills in the sunsetIMAGINE Nelson Mandela Bay filled with small, silent wind turbines and solar systems – and no more reliance on Eskom.

That is the vision of a pair of Port Elizabeth engineers who have designed a “hybrid inverter”, the Renovo Power Solution, which they say could save consumers millions at the same time as saving the world.

Wiegand von Hasseln and Trevor van Onselen have launched a series of public seminars to publicise their invention which they say is “the first energy system mix, manufactured and available for the open market, of its kind in South Africa”.

It is also the cheapest, they say, because the price of R2279 a month, paid off over five years, for their 1kW system, matches the cheapest wind turbine so far produced – and they are adding a photo-voltaic solar panel component. And from that price you can also, each month, subtract your current electricity bill. Continue reading »

Wind and solar power could become the world’s main sources of energy, a Nobel-prize winning scientist suggests.

Continuous research and development of alternative energy could soon lead to a new era in human history in which two renewable sources – solar and wind – will become Earth’s dominant contributor of energy, a Nobel laureate said here at a special symposium at the American Chemical Society’s 240th National Meeting.

Walter Kohn, Ph.D., who shared the 1998 Nobel Prize in Chemistry, noted that total oil and natural gas production, which today provides about 60 percent of global energy consumption, is expected to peak about 10 to 30 years from now, followed by a rapid decline. He is with the University of California, Santa Barbara. Continue reading »

Source – By Richard Black Environment correspondent, BBC News
North Pole The Arctic on 3rd September, as visualised using data from Nasa’s Aqua satellite

Ice floating on the Arctic Ocean melted unusually quickly this year, but did not shrink down to the record minimum area seen in 2007.

That is the preliminary finding of US scientists who say the summer minimum seems to have passed and the ice has entered its winter growth phase.

2010′s summer Arctic ice minimum is the third smallest in the satellite era.

Researchers say projections of summer ice disappearing entirely within the next few years increasingly look wrong. Continue reading »

The goal of the CPUC California Solar Initiative (CSI) is to create 1,940 megawatts of new, solar-produced electricity by 2016, moving the state toward a cleaner energy future and helping to lower the cost of solar systems for consumers.

by Staff Writers

Windsor, CO (SPX) Sep 15, 2010 Continue reading »

Coal Power PlantThe Regime of the day is the owner of Eskom.  This body maintains its monopoly on the supply of electricity by supplying this commodity mainly from a resource of coal.  Perhaps the honourable minister is unaware of some of the facts surrounding the coal that her coal fired power stations do for us and our future generations.

  • Of the top-25 highest CO2 emitting power generating plants worldwide, South Africa has three stations.
  • South Africa is number eight of the top 50 countries with the highest CO2 emitting power sectors. Continue reading »

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