Wind turbines are one of the most promising sources of large-scale renewable power.  Wind power doesn’t produce any pollutants, and unlike water or fuel resources, wind is literally an endless source of energy.  However, wind farms do require a substantial amount of space, which is why a much more efficient design like the “Wind Lens” could make wind energy cheaper and more practical.

Developed by researchers at Kyushu University’s Research Institute for Applied Mechanics (RIAM), the wind lens design utilizes a curved housing that encircles the blades of a wind turbine.  The ring is comprised of an inlet shroud, diffuser, and brim that work together to create a low-pressure pocket behind the turbine when wind passes around the ring.  The resulting suction can triple the effective wind speed that drives the turbine blades.

The Aerodynamics Behind The Wind Lens (image: Kyushu University RIAM)

Increasing the energy generated from a single turbine has the potential to make wind power even cheaper than nuclear energy, and wind turbines carry none of the risks associated with nuclear power plants.  Their primary drawbacks are interference with wildlife (such as migrating flocks of birds) and noise; fortunately, the Wind Lens design makes turbines quieter as well as more efficient.

But could wind turbines really make a substantial contribution to US energy demand?  Absolutely.  A recent MNN article by Karl Burkart breaks down the numbers in more detail, but the bottom line is this:  if improved turbines like the Wind Lens were installed in just 20% of America’s “high wind potential” areas, they could provide all the power consumed in the US.

Rendering Of An Offshore Application For Wind Lens Turbines (image: Kyushu University RIAM)

Prototypes are already being tested at Kyushu University.  And the developers are already thinking ahead to the possibilities for large-scale implementation, including floating offshore wind farms far out to sea that could take advantage of uninterrupted air currents without competing for space on land.

(via CleanTechnica & MNN)

When the largest economy in the European Union derives 20% of its energy from renewable sources, it is a milestone worthy of international attention. Germany’s renewable energy consumption jumped 2.5% within the last year, sending the total consumption of green power in that country to 20.8%. Since 2000, Germany’s use of renewable energy has increased 15 percentage points.

Driving this change is government action. After the Fukushima nuclear disaster, the German government reversed its policy of supporting nuclear power and declared it would work to phase out all of its nuclear energy by 2022. Along with the demotion of nuclear power, there has been a promotion of renewable power via a feed-in tariff mechanism. Germany’s feed-in tariff was established in 2000 under the Renewable Energy Sources Act. The Act encourages investment in renewable energy by providing companies with long-term contracts and defraying the higher implementation costs green technologies require.

The majority of German citizens support the increased taxes needed to finance feed-in tariffs. Germany plans to achieve 35% renewable electricity use by 2020.

Solar power has become the driving force in the growth of renewable energy in Germany. Solar’s 3.5% of total electricity production is 76% higher than it was last year, and solar now produces more renewable energy than hydropower. The bulk of German green energy is generated by wind and biomass sources.

There is some conflict over the growing infrastructure of German renewable electricity, which will require over 1,800 miles of new power lines by 2025 as well as new sites for windmills and solar panels. Despite their comfort with financing these projects, German citizens are not keen on seeing them built in their back yards.

New Zealand is one big step closer to accomplishing the ambitious goal of generating 90% of its electricity from renewable sources by 2025. The country already produces nearly 80% of its power from clean sources, including hydropower, geothermal, and wind farms. With hydropower approaching its natural limit, New Zealand is investing heavily in two huge new wind farms.

Currently, New Zealand’s wind farms produce 615 megawatts (MW), accounting for around 4% of the overall electricity generated in the country. The most ambitious goal aims for total wind power production of 3,000 MW, or 20% of the country’s total power needs. The two wind farms just approved will contribute 1,400 MW toward that target.

The larger of the two farms is being constructed by Genesis Energy. Its output will be 860 MW, generated by 286 turbines of up to 155 meters in height. The $1.46-billion project will be sited near Wellington in a remote part of Wairarapa. Twenty-seven rural land owners affected have signed land use agreements.

The second approved farm will spring up on the west coast between Port Waikato and Raglan, near Auckland. Here, 168 turbines will produce up to 540 MW. This farm is being developed by Contact Energy, which has agreed to limit the size of the turbines, minimize construction- and operation-related noise, and take measures to protect the local ecosystem.

The scope of these two projects is massive; the biggest New Zealand wind farm to date has only 62 turbines.

Texas oilman T. Boone Pickens has placed an the largest ever order for wind turbines: he ordered 667 wind turbines from GE, each costing $3 million dollars, making the total order $2 billion. Pickens plans to develop the world’s largest wind farm in the panhandle of Texas.

The $2 billion order is just one quarter of the total amount he plans to purchase. Once built, the wind farm would have the capacity to supply power to over 1,200,000 homes in North Texas. Each turbine will produce 1.5 megawatts of electricity. The first phase of the project will produce 1,000 megawatts, enough energy to power 300,000 homes. GE will begin delivering the turbines in 2010, and current plans call for the project to start producing power in 2011.Ultimately, Picken’s company, Mesa Power, plans to have enough turbines to produce 4,000 megawatts of energy, the overall project is expected to cost $10 billion and be completed in 2014.

Mesa Power has leased sparsely populated land in the Texas panhandle, where the wind often blows during daylight hours when energy needs are highest. Texas’ Competitive Renewable Energy Zones (CREZ) transmission lines will deliver what Pickens hopes will be “cost effective and reliable electricity generated by renewable energy power projects.”

Denmark has a problem — it’s generating too much power from the wind. Currently, Denmark gets about 20% of its total electrical power from wind. On windy days, that percentage can double. The ups and downs of wind power can strain an electricity grid. In western Denmark, the price of electricity can drop to zero on a windy day, leaving utilities scrambling to offload excess power or take a financial hit. To solve this problem, the Danish utility company Dong Energy plans to build a nationwide system to charge electric cars with the surplus wind power.

They are partnering with a start-up company in California, Project Better Place, and they are planning by 2010 to build the infrastructure to support a countrywide electric-car system, with charging spots and battery-exchange locations across Denmark.

“Cars are the perfect match for wind power,” said Shai Agassi, chief executive of Better, which is rolling out a similar network in Israel and has a deal with Renault and Nissan to build fully electric mass-market cars that run on lithium-ion batteries. “They charge sitting in the garage at night when there is little other demand for electricity.”

Dong, which has dealt with wind “intermittency” for years, has its hands full with the Danish government’s pledge to raise its share of electricity from renewable sources to 30% by 2025. “It’s an increasingly difficult challenge for us,” said Dong CEO Anders Eldrup. “We have to make our traditional fossil-fuel plants more flexible. That way we can turn power plants down, or even off, when the wind is blowing.”

In addition to revamping old plants, Denmark has built stronger connections to nearby Germany, Sweden and Norway so it can sell excess electricity on windy days. When it is windy in Denmark, countries like Norway buy cheap power to supplement their own hydropower resources. On very windy days about half of wind power is exported to Norway and Sweden, where many homes are heated with electricity.

“We have to keep investing heavily in the grid to make sure we can transport the electricity from wind when and where it is most needed,” said Peter Jorgensen, vice president at Energinet.dk, the nonprofit, state-owned company that runs Denmark’s grid.

Via: Dong Energy Press Release and Wall Street Journal

Wind power is breaking new records in Spain, accounting for just over 40 percent of all electricity consumed during a brief period last weekend. As heavy winds lashed Spain on Saturday evening wind parks generated 9,862 megawatts of power which translated to 40.8 percent of total consumption. Between Friday and Sunday wind power accounted for an average of 28 percent of all electricity demand in Spain. Spain’s wind power generation equaled that of hydropower for the first time in 2007.

In July the government approved legislation that will allow offshore wind parks to be set up along the nation’s vast coastline in an effort to boost the use of renewable energy sources. While more expensive than land-based wind farms, offshore wind parks can take advantage of stronger, steadier coastal breezes.

Spain, which along with Germany and Denmark, is among the three biggest producers of wind power in the 27-nation European Union, is aiming to triple the amount of energy it derives from renewable sources by 2020.

Varese Ligure, a town in Northern Italy, runs on 100% renewable power. The town uses a mix of wind, solar and small-scale hydropower. The town has reaped benefits from the energy network through added jobs, and an additional 350,000 euros [US $514,000] in revenues that are handed over to the council each year. Varese has also seen a six-fold increase in tourists in the last ten years, many coming just to see its renewable energy network.

Varese became the first municipality in Europe to get 100% of its power from renewable energy sources six years ago. It now generates three times more electricity than the people living in Varese need and there are plans in the pipeline for even more renewables.

The town has also launched initiatives to make Varese 100% sustainable. A total of 108 organic farms now supply 98 percent of the town’s food; water is purified using environmentally friendly technology, and waste has been significantly reduced.

Four wind turbines located on a ridge 1100 meters above sea level — where the average annual wind speed is 7.2 meters per second — generate 8 million kWh of electricity a year that is fed into the local grid managed by Acam, a power company in La Spezia. Photovoltaic (PV) panels have been installed on the town hall and the local school. The town hall has 102 PV panels covering 95 square meters and generating 12,700 kWh a year, which supplies 98 percent of the total energy consumption of the building. Varese’s secondary school has 39 PV panels covering 36 square meters and producing 4,600 kWh a year, which supplies 62 percent of the energy used.

In addition to the that, the town’s swimming pool is heated by solar power and a program to promote the use of wood pellet stoves is in the works.

Via: Renewable Energy Access

Personally, I find combination of clean energy and art to be compelling.  Michael Jantzen‘s designs certainly embody both ideas. Pictured above is his “Wind Shade Roof” concept – it’s a swimming pool complex with wind turbines integrated into the roof. The turbines provide power for night lighting, pool heating and pumps.

I’m sure the design is not entirely optimal, but also I’m would be amazing to stand inside this structure. See more photos on his web site. He has a number of similar clean energy projects in his portfolio.

Atlanta will soon be home to the Eco-Lofts, a condominium development that will run on 100% wind power. Located in Chamblee (just outside Atlanta), Eco-Lofts will feature loft-style condos that will range in price from $200,000 to $500,000. The entire building qualifies as EarthCraft, which is a local green building program that is similar to LEED.

Via: Equity Green