The designers say they may have overcome two drawbacks of traditional turbines. The turbine's triple helix form and vertical axis are said to make it almost silent, and it is believed to perform better in urban areas, where wind direction can vary by the minute. While there are other vertical-axis turbines, this is believed to be the first with three blades.
Morrisville, N.C.-based Raycap Inc., a manufacturer of transient voltage surge suppression modules and systems, has developed a 40mm version of the Strikesorb module. According to the company, the module can be integrated with original equipment manufacturer and switchgear products.
Critics argue that the cuts will hurt the country’s renewable energy initiative. Although geothermal plants produce less than 1 percent of nation’s electricity, experts believe there is significant potential to expand geothermal production. However, President Bush cut the research because he believes that private industry should take on the role of investing in geothermal and hydropower plants.
Indeed, the expense involved in developing renewable energy continues to be a concern ...Wind, solar and other alternative forms of energy just aren't yet competitive with traditional power sources and don't generate enough energy compared to the investment involved.
Puget Sound Energy has blanketed a rock quarry atop central Washington's Whisky Dick Mountain with solar modules in an unprecedented effort to test the compatibility of sun and wind energy.
More than 2,000 panels stretch squat and angular alongside the tall, sweeping turbine blades of the utility's Wild Horse wind farm near Ellensburg. ...Wind power has become the country's fastest-growing source of renewable energy, pushed by fossil-fuel concerns and government subsidies. But its up-and-down nature is a significant drawback.
To ensure that customers get uninterrupted power, wind power must be blended with electricity from more reliable energy producers, such as hydroelectric dams and coal- and natural gas-fired power plants. The integration can get complicated, and it can increase costs.
Puget Sound Energy's decision to commingle solar and wind represents a groundbreaking effort to blend two clean but unpredictable sources of energy into a renewable hybrid with more reliable generating credentials.
A cable that brings power ashore from an offshore windfarm has failed and needs to be replaced in the spring.
E.on, the firm that owns Scroby Sands windfarm two kilometres off the Norfolk coast at Caister, said one of its three high-voltage cables had failed.
This means that if the wind turbines are working at full capacity only 66% of the power can be brought ashore.
E.on's other off-shore windfarm at Blyth, Northumberland, is also awaiting repair after a sub-sea cable broke. ..."As we move forward we learn how the equipment interacts with the environment. That's part of the learning process.
A statement to the BBC released on behalf of energy minister Malcolm Wicks, said that off-shore windfarms were an emerging technology and that subsidising and investing in more was not a waste of money.
Campbell Dunford, CEO of REF, said: “This important modelling exercise shows that even with best efforts a large wind carpet in the UK would have a low capacity credit, and be a real handful to manage. This isn’t the best way to encourage China and India to move towards the low-carbon economy. As a matter of urgency, for the planet’s sake, we need to bring forward a much broader range of low carbon generating technologies, including the full sweep of renewables. Wind has a place, but it must not be allowed to squeeze out other technologies that have more to offer.”
The CORUS Centre, the Ion Beam Laboratory (LAFI) and LM Glasfiber have formed a research partnership to develop a surface treatment process to reduce the formation and build-up of different types of ice on the external parts of wind turbines. ..."The build-up and spread of ice on the blades cause the blades to be less aerodynamic and also cause many other problems such as increased vibrations, mechanical stresses and fatigue. Depending on the frequency of ice build-up and the severity of the icing, these phenomena can cause significant production losses".
Unlike the wind, tides are predictable. Also, water's greater density means fewer turbines are needed to produce the same amount of electricity as wind turbines. And since they're under water, tidal projects don't come with aesthetic issues like those associated with wind farms.
The use of windmills to offset home power costs - and perhaps even spin the meter backward - has produced mixed results in La Plata County.
"I'm disappointed in the production I'm getting," said Brad Blake, who installed a windmill 18 months ago on Florida Mesa. "It hasn't produced the power I expected."
Other green projects included a revolutionary new V-shaped wind turbine with blades the height of the Eiffel Tower could be moored at sea out of sight of land.
The Project Hayes site, which received consent from the Central Otago District Council, is located to the south of Ranfurly on the Lammermoor Range, about 70 km north-west of Dunedin. The consent decision allows for the full proposal of 176 turbines generating up to 630 megawatts ...Dr Turner expressed concern that the HVDC link between the North and South islands is being poorly managed.
"Not only is the charging regime unfair to South Island generators, it disadvantages new South Island generation projects - making them more expensive at the very time South Island security of supply is under real generation pressure.
Volume house builder Barratt Developments has published preliminary findings from its experimental ‘eco village’ project in Chorley, Lancashire – a 15 month long test of how effectively ‘green’ technologies can be incorporated into new homes. ...wind turbines were judged ‘disappointing’. Both the 1.7m and 1m turbine performed below the theoretical available output based on the recorded wind speed throughout the trial period. Simple payback period analysis has not been carried out.
Claims that there is no upper bound for wind power, that it is scalable because gusts and breezes don't seem likely to "run out" on a global scale, are not based on reality. And neither are claims that the generating capacity of large-scale wind farms is unlimited. The generating capacity of very large wind power installations ...may peak at between 0.5 and 1 watts per square meter. Previous estimates put that figure at between 2 and 7 watts per square meter.
Dr Williams argues that those calling for carbon-emission cuts of 25 per cent by 2030 do not understand what it would cost.
"We would need an extra 4500 two-megawatt wind turbines, 20 biomass generators, 30 new gas-fired base-load power stations and 12 best-of-breed coal-fired plants," she says. "It would require $60 billion in new infrastructure costs to build these."
Instead, she advocates replacing old coal-fired power plants with new ones, rather than "squeezing everything you can out of old assets" and looking at energy resources that have not been considered.
"What the council seeks is more investment in research, particularly in the sectors that it makes sense to invest in," she says. "Investment needs to be made in technology that can produce viable returns."
As Britain's longest river with the second biggest tidal range in the world, the River Severn has huge potential as a renewable resource.
It is estimated that if the water's power could be harnessed, it could account for as much as 10% of the UK's electricity needs.
Residents of the Grassy Ridge Road area near the Dominion Power Plant at Mount Storm want to know who is going to repair the roadway into their summer cabins and residential communities and when.
The road is being damaged by heavy equipment use during the construction of the NedPower wind project.
Ropin' the wind
November 10, 2006
by Brodie Farquhar, Correspondent
in Casper Star-Tribune
Greenblatt noted that while wind power could produce impressive amounts of peak energy during strong gusts, the biggest problem was wind power’s intermittency. The problem could be addressed by a process called compressed air energy storage, where excess energy could be used to pump compressed air into underground storage facilities that could include abandoned mines. When the wind was not blowing, he said, the compressed air could be tapped and combined with the burning of natural gas to create high-efficiency electrical generators approximating the efficiency levels of coal-fueled power plants.
The proposed development at Rotokawa is part of a significant geothermal expansion programme being undertaken by MRP in conjunction with its Maori partners and includes three other geothermal sites at Mokai, Kawerau and Nga Tamariki.
The second Rotokawa power station, owned jointly with the Tauhara North No 2 Trust and to be called Nga Awa Purua, will be built close to the existing one and will connect into existing 220kV transmission lines directly over the field.
The station is expected to generate an average of 1100 GWh annually and provide reliable base-load energy that is not sensitive to climatic variations. ...The new Nga Awa Purua power station will generate the same amount of energy as a 400MW wind farm and require much less transmission capacity.