Harnessing wind offshore and at higher altitude could meet all electricity needs — theoretically
NC State University
The U.S. has lagged behind other developed countries in capturing offshore wind for electricity..
The U.S. has lagged behind European countries in capturing offshore wind for electricity, but a spate of recent studies suggest that a bigger push might be in order.
The latest, from Stanford civil & environmental engineer Mark Jacobson concludes that off the East Coast alone is enough moving air to meet a third of the entire nation’s energy needs.
Running out the string quite a bit further, studies from Stanford and Lawrence Livermore National Lab point to a breezy bounty offshore and at higher altitudes that could theoretically power the planet, perhaps as soon as 2030.
Of course, that would take four million powerful turbines. Continue reading
Federal incentives can hasten development–or slow it down
By Nate Seltenrich
Last year brought a fresh breeze for wind energy, and projections indicate that 2012 will be even better. But over the next two years, a variety of forces could conspire to hamper wind energy development across the United States, despite a significant decline in the cost. These are the main findings of a new report by the US Department of Energy and the Lawrence Berkeley National Laboratory.
It’s that classic good news-bad news scenario: should proponents focus on the fact that in 2011 wind energy became cheaper, more efficient, and more widely distributed than ever? Or should they dwell on the looming challenges, including steep competition from cheap natural gas, inadequate high-voltage transmission in many parts of the country, and the possible expiration of federal incentives at the end of the year? Continue reading
High-tech imaging helps Colorado researchers catch the wind
Wind power has come a long way but maximizing the output of even modern wind farms is still a challenge.
It isn’t enough to buy a slew of multi-megawatt turbines and stake them on a windy hillside. You have to know how the wind behaves, not only going into the turbine but the “wake” coming out the backside. Otherwise, you can get more windstorm than wattage. It’s a new area of research and it got help this week from scientists who literally “look” at the wind.
Speaking at the American Geophysical Union (#AGU11) here in San Francisco, Julie Lundquist from the University of Colorado, Boulder, offered up her team’s images of a wind turbine’s wake. Using Doppler Lidar — think police radar gun — she showed us the color-coded flow: a slower, cool-colored wake at the center just behind the turbine, surrounded by the warmer-colored fast flow swirling around it. Continue reading
High altitude winds may have more than 100 times the energy needed to power civilization. But as this video from KQED’s QUEST explains, capturing that power is going to take some very creative solutions.
By Chris Bauer
A dreamer stares up into the sky, watches the clouds slowly pass by and ponders what could be. From da Vinci to Newton to the Wright brothers to the little kid down the street, sometimes there’s a fine line between the day-dreamer and the visionary. And now a group of innovative thinkers are looking at those same passing clouds in a whole new way.
Looking up at the jet stream, Ken Caldeira, a climate scientist from the Carnegie Institution of Global Ecology at Stanford University says, “We find that there’s more than 100 times the power necessary to power civilization in these high altitude winds.” 100 times the energy to power the world is going to get people’s attention.
The global need for clean energy is pushing scientists and engineers to search for new, untapped sources of energy. “To solve this problem we need a real revolution in our system of energy development,” continues Caldeira, “We need huge amounts of power, and the things that can provide huge amounts of power include fossil fuels like coal, oil and gas; nuclear power, solar power and wind.” The strongest and most consistent winds are found in the jet stream as high as 30,000 feet above the earth. But how do you harness the wind power from that high? Now the race is on to find the answer to that question. Continue reading
A possible game changer in wind technology with an unlikely inspiration
Vertical-axis wind turbines at a CalTech test site in northern Los Angeles County.
Most of the wind turbines you see driving throughout the deserts and hill country of California look pretty much the same: soaring towers hundreds of feet high with massive, pinwheel-like structures on top, blades churning (or not) as the wind blows (or not).
But there’s another design for generating wind power that, if new research proves correct, could eventually become a far more common sight as California ramps up its portfolio of renewable energy. Vertical axis wind turbines look a little like upside-down egg beaters. They tend to be smaller than traditional turbines, and therefore less powerful. But according to John Dabiri, head of Caltech’s Biological Propulsion Lab, they can be far more efficient at generating power than traditional turbines are when they’re used together in just the right way.
Dabiri said the problem with standard turbines is that the turbulence or “wake” from the turning of one turbine disrupts airflow and reduces the performance of surrounding turbines. Locating them within 300 feet of each other can reduce performance by 20-50%, said Dabiri. That means standard wind farms need a lot of land. Continue reading