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Here's a wave power technology which you may not have heard of: It's called the Searaser and (though only in prototype stages, I've got some reservations about how well it may scale up, as well as the name which somehow I always see as 'Sea Eraser') it may be worth watching. The principle is fairly simple and proven in a different context: Use the Searaser to pump quantities of sea water up a hill where it can be stored in ponds until needed and then released downhill to drive hydroelectric turbines to create power. This is how the Searaser works:

The world is finally doing something about climate change. People are changing their light bulbs and buying hybrid vehicles. Renewable energy is gaining ground. But is this enough? Policy-makers insist that environmental responsibility not come at the expense of economic growth. Massive populations in China and India are playing catch-up with America's consuming and polluting ways. And on a planet biologists believe can only support a few billion humans over the long haul, our population is near seven billion and continuing to rise. Will our efforts to save the planet be nullified by our worship of growth?

While still a small percentage of overall electric generation, there's no denying that wind power has been growing consistently in the United States. In 2007, an additional 5,329 megawatts of capacity was added, an amount which was slightly more than a quarter of all new global wind capacity that year. Currently an additional 8 gigawatts of wind capacity is under construction and scheduled to be operational by the end of 2008. The result: This will be the third straight year that the United States leads the world in annual wind power installations, according to a new study by Emerging Energy Research.

Scientists mimic essence of plants' energy storage system. In a revolutionary leap that could transform solar power from a marginal, boutique alternative into a mainstream energy source, MIT researchers have overcome a major barrier to large-scale solar power: storing energy for use when the sun doesn't shine.

While certain American politicians complain about a million bucks being included in the country's energy plan to promote bikes, in the UK they are investing £140 million (about US$ 280 million) to create dedicated bike lanes, provide bike parking, safety training, on-street bike rental networks and a campaign to promote bicycling in 12 Cycling Demonstration Towns.

The incandescent lightbulb that wastes 90% of the electricity as heat is dying, we all know that. But a new breakthrough in solid state lighting might also kill compact fluorescent lightbulbs (CFLs) faster than some expected. Scientists at Purdue University have figured out how to manufacture LED solid-state lights on regular metal-coated silicon wafers (more details below). What this means is: much lower costs.

I used to be a strict modernist; my role at TreeHugger was to demonstrate that green design could be wonderful and cool and I filled the site with all kinds of modern houses with some claim, often weak, for being green. Those houses became less common on the site in recent times, as I worried more about house size, the appropriateness of single family dwellings on big suburban lots, and trying to reconcile my love of clean, modern design with my concern about the use of fossil fuels or building materials that cannot be maintained in a world made by hand.

Despite an unstable regulatory environment-renewable energy tax incentives are stalled in the senate, BLM policy has been inconsistent- the United States will surpass Germany to be the largest market for solar power in the world by 2011, according to a report by JP Morgan, cited in Greentech Media. By 2011, the US will have an installed capacity of 1.6 gigawatts (with 920 MW in California alone), surpassing Germany's expected capacity of 1.35 gigawatts. The third largest market by this time will be South Korea with 957 megawatts of capacity.

If Corus Group, an Anglo-Dutch steel manufacturer, has its way and their new work into developing solar cell paint comes to pass, the whole concept of what types of material can be used for generate electricity through photovoltaics could change. At least that's the promise. Renewable Energy World is saying that production on Corus' solar steel sheets could begin in three years, though doesn't really go beyond that in terms of timelines. The way it would work is this:

From Holland, the country famous for its windmills, comes a new design for home wind power. Looking like an eggbeater, it spins quieter and at lower wind speeds than a lot of traditional propeller-type turbines. It's now standard for big wind turbines to have propeller blades. Much of the turning force is generated at the tips, which slice perpendicularly through the air, causing a swooshing noise that some residents nearby have said they find unnerving.

Visitors to Rehoboth Beach, Del., soon may be greeted by more than sand dunes, seagulls and beach umbrellas. If offshore wind advocates have their way, scores of 140-foot blades will be spinning in the ocean breeze nearly a dozen miles away, barely visible to the sunbathers.

The City Council on Wednesday became the first in Ohio with a plan to channel grants and loans to residents and businesses to replace tar and shingles with vegetation. Supporters of the idea want to see Cincinnati become a leader in green roofs, a European-born movement that has spread to only a few U.S. cities, including Chicago, Milwaukee and Seattle.

Our Renewable Nation is possibly the most adorable project ever conceived to advocate renewable energy. It's an eco-video project helmed by the McCullough family, who are traveling across the country in a vegetable oil powered VW Beetle. They're visiting wind farms, solar installations, talking to companies developing sustainable technologies, and documenting all their interviews and travels on video. Each of the videos stars 9-year old Carrick McCollough, the cutest kid to campaign in the name of renewable energy. And it's effective. Don't believe me? Just watch the video after the jump, where Carrick implores grownups to not blow it for him and his generation. How can we say no to this?

Part of creating the ultimate sustainable planet will be our ability to find sustainable energy sources in a variety of means, such as sunlight, water flow, wind, and yes, even rain. We are of course speaking of the kinetic energy which can be harnessed from rain, which up until a few months ago, was not being considered for use in a consumer product... Lightdrops Umbrella This kinetic energy is created from piezoelectric material, which is able to convert mechanical energy into electrical energy. Now, we aren't talking about a whole lot of energy being created here, approximately 1 microwatt to 12 milliwatts per rain droplet. While not much in the large scheme of things, this technology has been put to use in a new LED umbrella called Lightdrops, which is able to self power an internal LED light using the rain from which it is protecting its user from.

Spiegel Online published a series of pictures titled "Desertec: Strom aus der Wüste" (translation: Desertech: Electricity from the desert). It includes this image of how much land would be needed to power the world, Europe or Germany with solar-thermal power. The idea is similar to a post we did a year ago: How Much Land to Power The Whole World with Solar?

"The world's southernmost wind farm, in Antarctica, is now operational. The Ross Island wind farm will supply about 11 percent of the power to New Zealand's Scott Base and the American McMurdo Station. Previously, the two sites relied on diesel-powered generators for electricity. The wind farm will cut diesel consumption by about 463,000 liters a year and reduce carbon dioxide output by 1,370 tons annually, according to New Zealand-based Meridian Energy, the project's developer. The three turbines, each 37 meters tall and 33 meters wide, are generating 330 kilowatts of power."

Officially grid-connected and set to work this week in Germany is a new wind tower from ATS. The novel tower construction allows very high hub heights that may increase a turbine's yield by 20% or more. With its hub height of 133 meters (436 feet), the system has an overall height of 180 meters (590 feet). "This is a great day for wind energy." said Frans Brughuis, Managing Director of the tower construction specialist Advanced Tower Systems (ATS). "Now the pilot project can demonstrate the high cost-effectiveness and efficiency of the ATS concept," The system, one of the largest wind energy systems with hybrid tower in the world, is installed at Germany's Windtest test field at Grevenbroich, near Cologne.

What do you do if you build a wind farm smack dab in the middle of a major bird migration route, and want to avert the anger of conservationists? Put up a radar system that's designed to shut down the entire thing when it detects a mass of birds on the way. That's what's been done at the 202 MW Peñascal Wind Farm in Texas: System Detects Birds Approaching Four Miles Away The system uses radar originally developed for NASA and the US Air Force to detect birds as far as four miles away, The Guardian reports. When it picks up the approaching birds, it analyzes the existing weather conditions and determines in real time whether those birds are in danger of flying into the blades. The system then automatically restarts the turbines when the birds have passed.

Largest Grassroots Solar Event in America: Register Now! Imagine 140,000 people participating in a national tour of solar-powered homes and institutions - all in one day. That's what happened last year at the American Solar Energy Society (ASES) National Solar Tour - and this year looks set to be even bigger. Whether it's DIY solar homes and solar cars, new homes with solar as standard, or utility-scale multi-megawatt solar installations, TreeHugger is not short of stories about how solar power is leading us away from fossil fuel dependence and helping to stem climate change. But while change is beginning to happen, it's not happening anywhere near fast enough. That's why the ASES tour is so important - getting people in front of real, live solar installations, showing them how they work, and encouraging folks to go solar themselves. Read on to find out how you can participate.

The world's first floating wind turbine is to be towed out to sea this weekend. Statoil's Alexandra Beck Gjorv told the BBC the technology, the Hywind, to be put off Norway's coast - "should help move offshore wind farms out of sight". And it could lead to offshore wind farms eventually being located many miles offshore, away from areas where they cause disruption, Ms Gjorv added. This would benefit military radar operations, the shipping industry, fisheries, bird life and tourism.