Tangarie Alternative Power's spiral wind turbine - The Greenpower Utility System line of vertical axis wind turbines produces up to 50% more electricity on an annual basis, generates electricity in winds as low as 4 mph (1.5 m/s), and continues to generate power in wind speeds up to 130 mph (60m/s). It withstands extreme weather such as frost, ice, sand, humidity; and is low-noise. (PESWiki)

TESNIC vertical-axis wind turbine - The TESNIC is based on the principles of the Tesla turbine, extracting the wind power via adhesion, in addition to the classic drag and lift extraction, enabling it to achieve a very high efficiency, with the potential cost of electricity produced below the utility price. (PESWiki.com)

Neo-AeroDynamic - New device harnesses torque from both kinetic and pneumatic energy of the fluid flow (wind or water). Since the 'lift' forces are caused by artificial flow of the fluid (air;wind/water) around the center of the turbine, the turbine's worst enemy -- turbulence -- is neutralized; making it ideal for urban/city roof top and backyard settings.

TMA Global Wind Energy Systems - Vertical axis wind turbine design creates pull on the back side contributing to 40%+ wind conversion efficiencies, doesn't kill birds, runs more quietly, doesn't need to be installed as high, blends better with landscape. Cost-competitive with the best horizontal axis propeller designs. Going commercial.

Mass Megawatts Wind Power (http://www.massmegawatts.com/) - The Multi-Axis Turbosystem (MAT) is capable of generating electricity at 2.5 cents per kilowatt-hour at an average wind speed of 15.5 miles per hour. It can withstand 120 mile per hour winds, and level four earthquakes.

StatoEolien Vertical-Axis Wind Turbine - The power curve of this French design is surprisingly different than power curves for conventional turbines because the output increases until the velocity of the wind is above the lower hurricane levels.

EnergyTower is a Mini Tornado Energy Device - The Energytower is said to be a controlled reproduction of a tornado inside a cylindrical tower.

Windspire: 1 kW Wind Turbine for Your Backyard (http://www.treehugger.com/files/2007/09/windspire_1_kw.php) - At 30 feet tall and 2 feet wide, the propeller-less Windspire (http://mariahpower.com/index.php?option=com_content&task=view&id=13&Itemid=35) design produces 2000 kilowatt-hours per year, is bird-safe, relatively quiet, and begins turning at 8 mph, and is rated to survive 100 mph gusts. At a price of ~$4,000, the return on investment will take about 20 years. (TreeHugger; Sept. 8, 2007)
- Windspire's Final Testing (http://www.aer-online.com/e107_plugins/content/content_lt.php?content.367) - Mariah Power (http://www.mariah-power.com/) is testing the Windspire, a residential-scale wind turbine that may overcome historical obstacles such as cost and aesthetics. It is a complete consumer-friendly appliance that is designed for plug-and-produce installation, with a 30-foot standard height that is below the typical residential zoning restrictions. (Alternative Energy Retailer; Mar. 21, 2007)

Windside (http://www.windside.com/) turbine works when others don’t, with gentle summer breezes and violent winter storms. Windside produces at least 50 % more electricity in a year than propeller models. They are soundless, do not kill birds or people, are safe to use in public spaces and on buildings. In many cases they have been used to combine art and functionality.

PacWind Vertical Axis Wind Turbine (http://www.pacwind.net) - SeaHawk has a rated median power of 1000 Watts. It comes with 3-Phase Rectifier Bridge and controller. Simply mount the turbine, add batteries, fuses, dump load and cabling, and your station is complete.

quietrevolution (http://www.quietrevolution.co.uk/) - Virtually silent and vibration free, quietrevolution is ideally suited to both urban sites and exposed locations. The simple and robust design has just one moving part, maximising reliability and minimising maintenance requirements.

Sustainable Energy Technologies (http://www.sustainableenergy.com/SET-wind-turbine/SET-wind-turbine.html) - The SES 250 Vertical Axis Wind Turbine is specifically designed to optimize the competitive advantages of the Darrieus type turbine. It is an uncomplicated wind turbine that can be easily transported to the site, installed without heavy equipment and maintained by individuals with basic electrical and mechanical skills.

V.A.W.T. Industries (http://www.goldrockholdings.com/vawt.html) - The V.A.W.T. Wind Turbine increases the wind speed and kinetic energy at the rotor with curved deflection blades, which allow the turbine to react to the slightest breeze and provide it with a much higher power output per given wind speed. The venturi effect eliminates backpressure on the return side of the rotor, which increases the overall torque.

Solwind (http://www.solwind.co.nz/) - The SW VAWT are extremely quiet in operation. At high wind speeds the SW VAWT series will start to stall, causing the machine to slow down at around 27 meters per second. In the 'stalling mode', the SW VAWT series will automatically maintain its output speed.

Eurowind Developments (http://www.eurowind-uk.net/) - The Vertical Axis Wind Turbine Modular Unit (VAWTMU) could be utilized on old or new structures, on-shore or off-shore, in a wind farm or in an industrial area. Due to its simple modular construction the machine will cost less than its comparable Horizontal Axis Wind Turbine.

Global Wind Technology (http://www.globalwindtech.com/) has developed and is currently commercializing the world's first economically viable and scalable Vertical Axis Wind Turbine ("VAWT") electric generation system, based on proprietary air-foil/winged shaped blades made of composite materials and special direct-drive Permanent Magnet Generators.

SpiralAirFoil Wind Turbine - Patent pending design put forth by Dan Parker is in the R&D phase, with expectation of going to market in 2008.

Wind Harvest (http://www.windharvest.com/) is focusing on commercializing its 50-foot tall, 500kW six-turbine Windstar 1400 Array for installation beneath tall turbines in high wind resource wind farms.

enecom (http://www.nakaointl.com/products_e/energy_e/index_e.html) - The design of the blades is based on Professor Seki's innovative aerodynamics theory. It utilizes less, slower and variable directional wind. As a result, it enables the production of more energy and more stable production.

Wind Rotor (http://www.windrotor.net/) - Utilizes winds of all directions in the range from 3 m/s to 50 m/s; the generator, gearbox etc. are on the ground level; no yaw mechanism required (to turn the rotor against the wind); self-starting; low-maintenance.

Dermond (http://www.gpe-technologies.com/) - WindStor vertical axis wind turbine features three curving blades coming together at the top of the mast, combining grace, beauty, strength and efficiency. It has advantages over other wind turbine technologies for urban applications.

Ropatec (http://www.ropatec.com/) windrotors do not have to be braked, not even during storm gusts. They start at a wind speed of just 2-3 m/s. Because of its simple and reliable construction, the windrotor does not need any regular maintanance. See also The Strand Wind Project (http://www.seao2.com/strand-wind/index.html) - The Ropatec was the chosen turbine because it had an aesthetic that permitted its use in an urban area. It is also rated for very high wind speeds. It is claimed that the wind rotor will still produce energy in winds up to 230 kmh!

GC Power (http://www.gcpower.com/_ourturbine.htm) - By combining multiple turbines into structures called “WindWalls", GC Power can generate electricity in locations where current wind-farming technology is not feasible, such as the tops of buildings and off-shore platforms.

Vertical Wind Turbine Technologies (http://www.windcrank.com/) - Windcrank (http://www.geocities.com/windcrank/index.html) - a series of "blades" capture impulse wind energy. Deflectors are placed on the tip of each blade to boost power and a flywheel effect. A deflector directs the wind forces to the inside of the blades and diverts wind from the back side. Louvers provide a sail effect for increased turbine efficiency.

Ettridge Wind Turbine (http://www.ettridgewindturbine.com/) - Improved Savonius rotary wind turbine uses a shield to cover the blades on the upwind leg and overhead scoops to direct air into the tunnel created by the rotor and wind shield. The blades are driven for the full 360 degrees, greatly improving low wind speed start up and efficiency.

New Rooftop Wind Turbine Tested (http://www.metaefficient.com/archives/renewable-power/new-rooftop-wind-turbine-tested-the-helyx.html) - The Helyx Wind Generator (http://oregonwind.com/) is composed of two twisted wings of bright green fiberglass that rotate around a vertical axis, designed to take advantage of low wind speeds, with an estimated production cost of $1.50 per watt. The 40-inch tall turbines will be tested on the rooftops at Portland State University, to see if they adequately harvest energy in an urban environment. (MetaEfficient)

Helix Wind (http://www.helixwind.com/) - The Savonius turbine based design catches wind from all directions, is self-starting, nearly silent and does not need over speed control. Mounted up to 35 feet high, in winds as low as 10 mph the Helix system creates electricity to power your home or business.

Vertical axis wind turbine bucks horizontal trend (http://www.RenewableEnergyAccess.com/rea/news/story?id=45371) - Construction is currently under way this month on a rare wind energy project, a 200 kilowatt (kW) vertical-axis wind turbine outside a large residential complex in Michigan. (Renewable Energy Access; July 10, 2006)

‘Windy City’ is testing rooftop turbine power (http://www.gulf-times.com/site/topics/article.asp?cu_no=2&item_no=89116&version=1&template_id=48&parent_id=28) - "Aeroturbines" (http://www.aerotecture.com/), with double-helix rotors caged in cylinders instead of exposed blades, is intended to limit bird kills, ice buildup, roof-rattling vibrations and howling noise. (Gulf Times; May 30, 2006)

vertical-axis wind turbines nearing market (http://www.turby.nl/Turby) - Vertical axis wind turbine especially developed for roof tops on high buildings. Small, transparent, low noise, vibration-free, low maintenance, installs without need for crane. (Nov. 2005)

Aerowind Systems (http://www.aerowinds.com/) - Aerospiral is designed for urban environments where wind speeds are lower and wind directions change frequently. The plate generator and sprial blades provide good performance in turbulent winds and reduce noise and vibration for use on buildings.

Oy Windside Production Ltd (http://www.windside.com/) - Vertical-axis turbines by Finish company work in hurricanes and light breezes, producing electricity at least 50% more in a year than traditional propeller models.....and they look like art. Low price tag, long-enduring.

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Open Source

Raymond Cross-Flow-Blower Vertical Axis Wind Turbine - Frank Raymond wishes to pass the baton on his studies to someone else. Tested prototype.

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Other Applications Besides Electricity

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Water from Air

Max Whisson's Gust Water Trap Apparatus - The Whisson vertical windmill cools the air passing through the whirling blades. As it does so, a proprietary process collects condensate, yielding fresh water from the air.

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In the News

New Turbine Design Wins Sustainability Award (http://www.treehugger.com/files/2007/06/new_turbine_des.php) - BSI (http://www.bsi-global.com/en/About-BSI/News-Room/BSI-News-Content/Disciplines/Sustainability/Wind-turbine/) gave first prize in its Sustainability Awards 2007 to Ben Storan for his "afforable personal wind turbine suited to the urban environment." The unique design uses vertical rotation, which allows the turbine to capture 3x more energy than current models, from turbulent urban air flow. (TreeHugger; Jun. 20, 2007)

VAWT Is Self-Starting and Self-Regulating (http://www.renewableenergyaccess.com/rea/news/story?id=47509) - The PacWind (http://www.pacwind.net/) Delta I Vertical Axis Wind Turbine (VAWT) is self-starting, self-regulating and captures very low speed winds. It maintains peak power output in high winds without over spinning, and transfers from drag mode to lift mode in winds of 4-5 meters per second, resulting in a fourfold surge in power output. (Renewable Energy Access; Feb. 21, 2007)

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