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Grist has a post on a plan by "RePower America" to shift to 100% renewable electricity by 2018 - 100 percent renewables in 10 years. Following up on Wednesday's "Now what?" ads, the Alliance for Climate Protection has launched a new website, RepowerAmerica.org, calling for 100 percent of U.S. electricity to be drawn from renewable sources within the next 10 years. The group also has a new television ad by the same name, which will run through Saturday on CNN, Fox News, Headline News, and MSNBC ... and another ad will run all next week, starting Sunday on the morning news shows.

- Installed capacity in China's wind power sector will grow 64 percent this year to 20 million kilowatts, organizers of the 3rd China (Shanghai) International Wind Energy Exhibition and Symposium 2009 forecast Friday. Installed capacity grew 105 percent last year. Chinese industry experts believe that by about 2020, wind power will likely surpass nuclear power as China's third-largest source of electricity, after thermal and hydro power. Wind power comprised 1.5 percent of China's total installed capacity in 2008, when the country became the world's fourth-largest wind power market.

The 2008 figures are in from the new REN 21 Renewables Global Status Report: Renewable power capacity (excluding large hydropower) increased a hefty 16 percent last year, which is remarkable given that world oil use actually declined. Growth in some renewable sectors was even more impressive. Biodiesel production increased 34 percent, and solar power took the prize with a 73 percent jump. Renewable energy has not entirely escaped the impact of the global recession - growth this year will almost certainly be slower - but it is clear that global energy markets have turned a corner. Political support and business investment in new energy sources have reached the point where the new industries appear hard to stop. REN 21 reports that 64 nations now have policies to promote renewable power generation. Scientists, engineers, and entrepreneurs across the globe are responding with unprecedented innovation. Overnight, the energy business has begun to resemble the I.T. industry more than it does the energy industry of the past.

The U.S. Department of Energy and the National Renewable Energy Laboratory have released the first technical support documents to show 50 percent energy savings in commercial retail buildings. The two reports provide recommendations on how to achieve 50 percent energy savings over the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Standard 90.1-2004 in grocery stores and medium-sized retail buildings. Conducted by NREL's Commercial Buildings team, under the direction of DOE's Building Technologies Program, the studies support DOE's goal of producing market-ready, net-zero energy commercial buildings by 2025.

An assessment of the "electric productivity" of the 50 states indicates that shoring up performance gaps through energy efficiency could not only cut consumption by 30 percent, but also eliminate the need for more than 60 percent of coal-fired generation, according to a new study by the Rocky Mountain Institute. The RMI study, "Assessing the Electric Productivity Gap and the U.S. Efficiency Opportunity," determines the productivity rate of each state by measuring how much gross domestic product is generated for each kilowatt-hour consumed.

"Wind energy could generate 20 percent of the electricity needed by households and businesses in the eastern half of the United States by 2024, but it would require up to $90 billion in investment, according to a government report released on Wednesday. For the 20 percent wind scenario to work, billions must be spent on installing wind towers on land and sea and about 22,000 miles of new high-tech power lines to carry the electricity to cities, according to the study from the Energy Department's National Renewable Energy Laboratory."

Technology Review has an article on advances in wind turbine technology - Better Wind Turbines. ExRo Technologies, a startup based in Vancouver, BC, has developed a new kind of generator that's well suited to harvesting energy from wind. It could lower the cost of wind turbines while increasing their power output by 50 percent. The new generator runs efficiently over a wider range of conditions than conventional generators do. When the shaft running through an ordinary generator is turning at the optimal rate, more than 90 percent of its energy can be converted into electricity. But if it speeds up or slows down, the generator's efficiency drops dramatically. This isn't a problem in conventional power plants, where the turbines turn at a steady rate, fed by a constant supply of energy from coal or some other fuel. But wind speed can vary wildly. Turbine blades that change pitch to catch more or less wind can help, as can transmissions that mediate between the spinning blades and the generator shaft. But transmissions add both manufacturing and maintenance costs, and there's a limit to how much changing the blade angle can compensate for changing winds.

Understanding wind energy can be a challenge. But it is no more complicated than the choices we are making on transportation. And just like those choices, wind is great for Pennsylvania's economy as well as our environment. Pennsylvania wind farms generate power about 70 percent of the time. But the amount of power is variable. That's why it is rated at 30 percent of capacity. It's like having a car that can go 100 mph but your average speed is much less.

Engineers are putting hybrid drivetrains into everything from SUVs to locomotives these days, and General Electric wants to take the technology to sea in a tugboat that could burn 35 percent less fuel and emit 80 percent less pollution than anything else on the water.

The government plans to announce policy measures aimed at halving the price of solar power generation in the next three to five years as part of its action plan on greenhouse gas emissions, government sources say. According to the sources, the measures will form part of an action plan designed to bring about a 60 percent to 80 percent cut in carbon dioxide emissions by 2050 and thereby create a low carbon-emission society.

Wind supplied more of Britain's electricity that water for the first time last year, while power generators preferred gas to coal and nuclear output continued to decline, according to new government data. Five percent of Britain's electricity came from renewable sources in 2007, up from 4.6 percent in 2006, as more wind farms started feeding clean electricity into the network, helping cut the country's carbon emissions.

TENNESSEE The average Tennessee household uses 41 percent more electricity than the typical American household, but Joe Hoagland is determined to lessen that disparity. As senior vice president of energy conservation for the Tennessee Valley Authority, Dr. Hoagland heads a $99 million program this year to help convince Tennessee Valley power users to buy less of what TVA sells. With today's increase in power rates of 2 percent, his job has gotten a little easier.

Electricity generation and electricity sales reached record levels in 2007, according to "Electric Power Annual 2007″, released today by the Energy Information Administration. Following a year of relatively weak growth in 2006, net generation of electric power increased by 2.3 percent, rising to 4,157 million megawatthours and retail sales rose by 2.6 percent to 3,765 million megawatthours in 2007. Continued economic growth in 2007, combined with changes in winter and summer temperatures relative to 2006 that added to electricity use for space heating and cooling requirements, contributed to the increase in electricity sales.

The 25-percent-by-2025 renewable electricity standard bill introduced today by Rep. Edward Markey (D-Mass.) and Rep. Todd Platts (R-Pa.) would boost renewable energy generation by 135 percent above and beyond current policies between now and 2025, according to the Union of Concerned Scientists' preliminary analysis of the legislation. "This electrifying standard would provide a smart, proven, cost-effective strategy to ramp up our clean energy use, create tens of thousands of jobs, and lower consumer utility bills," said Alan Nogee, UCS Clean Energy Program director. "The clean energy tax incentives that Congress is finalizing will get us moving in the right direction in the near term, and the renewable energy standard makes sure we stay on that path for the foreseeable future."

In a new study, conducted by the Rock Mountain Institute, it has been found that electricity consumption can be reduced by 30 percent through energy efficiency and coal powered power generation can be reduced by 60 percent. vote nowBuzz up! The study, which spanned across 50 states, identified five states with highest electric productivity rates - New York, Alaska, Connecticut, Delaware and California - and stated that if all other states were to adopt similar efficiency parameters are implemented in other states the whole country can save up to 1.2 million gigawatt-hours annually. The study also brought out the long-term benefits of improving the electric productivity

REW has an article on making the switch to a clean energy world - Will the Children of Today Be Living in a World Powered by Renewable Energy by 2050?. The world needs a one-off switch-over to renewable energy -- and this could be largely accomplished in just forty years time, slashing energy costs and greenhouse gases while allowing healthy economic growth, experts say. By 2050, 80 percent of the world's electricity could be coming from renewable energy sources provided efforts are made, in parallel, to improve energy efficiency, according to a study by the German Aerospace Center (DLR). That means, the children of today might well grow up to experience a world where the energy they use comes almost entirely from the sun, wind, sea and biomass. By 2090, the shift to renewable energy around the world could be almost 99 percent completed reducing pressure on the environment and laying the foundations for a new era of prosperity based on green energy.

Global wind power capacity reached 94,100 megawatts by the end of 2007, up 27 percent from the previous year, and then topped 100,000 megawatts by April 2008.1 (See Figure 1.) The roughly 20,000 megawatts installed in 2007 was 31 percent above the 2006 record for capacity additions.2 (See Figure 2.) New wind installa­tions were second only to natural gas in the United States as an additional source of power capacity and were the leading source of new capacity in the European Union (EU).3

WASHINGTON (AP) - An Energy Department report concludes that wind turbines can produce a fifth of the nation's annual electricity needs within about two decades. That is about the same share of electricity produced today by nuclear power. Wind energy today accounts for only about 1 percent of the nation's electricity. The government report to be released Monday said by 2030 wind energy could account for 300,000 megawatts of power, or about 20 percent of the total electricity generated.