A former NASA scientist has used radio waves to transmit solar power a distance of 92 miles (148 km) between two Hawaiian islands, an achievement that he says proves the technology exists to beam solar power from satellites back to Earth. John C. Mankins demonstrated the solar power transmission for the Discovery Channel, which paid for the four month experiment and will broadcast the results Friday at 9 p.m. EDT. His vision is to transmit solar power collected by orbiting satellites as large as 1,102 pounds (500 kg) to lake-sized receiver stations on Earth.

Integrating solar cells into building materials could make solar power more attractive to homeowners. Seamless solar: The solar system shown here (darker panels) integrates thin-film solar modules directly into a metal roof. Such systems offer cost savings in labor and materials and blend well with buildings' designs. Credit: EnergyPeak In an effort to promote the adoption of solar technology, United Solar Ovonic of Auburn Hills, MI, has teamed with a major roofing company to create a metal roof system that generates electricity from sunlight. The partnership offers seven different prefabricated systems, ranging in capacity from 3 to 120 kilowatts. Tests show that the solar roof panels are rugged and can withstand winds in excess of 160 miles per hour.

The Upper Great Plains Wind Energy Programmatic EIS Information Center Web site was launched September 11, 2008. This Web site is the online center for public information and involvement in the Upper Great Plains Wind Energy Programmatic Environmental Impact Statement. The U.S. Department of Energy, Western Area Power Administration (Western), and the U.S. Department of the Interior, Fish and Wildlife Service (Service), will prepare a Programmatic Environmental Impact Statement (PEIS) to evaluate the impacts of wind energy development within Western's Upper Great Plains Customer Service Region (UGP Region), which encompasses all or parts of the States of Iowa, Minnesota, Montana, Nebraska, North Dakota, and South Dakota; and on the Service's landscape-level grassland and wetland easements in North Dakota, South Dakota, and eastern Montana.

In a high profile campaign, West Virginia citizens have asked for a last minute 'stay of execution' against the imminent destruction of the site of a proposed wind farm on the state's Coal River Mountain. Handing in a petition, signed by more than 8,000 residents, campaigners today called on State Governor Minchin to make good on his commitment to support the development of renewable energy in the state, and order a halt to the destruction of an area with enough wind power potential to supply 150,000 homes.

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.

A new breed of solar tower may soon be sprouting up in Namibia, providing the nation with a carbon-free source of electricity and food during the day and night. At one and a half kilometers tall and 280 meters wide, these massive solar updraft towers could potentially produce 400MW of energy each - enough to power Windhoek, the nation's capital. Proposed by intellectual property company Hahn & Hahn, the towers generate energy by forcing heated air through a shaft lined with wind turbines. Additionally, the base of each tower will function as a 37 square km greenhouse where crops can be grown.

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.

It wasn't the variable of available sunshine in their suburban Chicago neighborhood that inhibited Sarah and Kiril Lozanov from going solar. Rather, it was the challenge of cost - and of earning homeowner's association approval for the new construction solar would warrant on their condominium rooftop.

"Our opponents say, again and again, that drilling will not solve all of America's energy problems - as if we all didn't know that already. But the fact that drilling won't solve every problem is no excuse to do nothing at all.

The world must speed up the deployment of solar power as it has the potential to meet all the world's energy needs, the chairman of an industry gathering which wrapped up Friday in Spain said. "The solar energy resource is enormous, and distributed all over the world, in all countries and also oceans," said Daniel Lincot, the chairman of the five-day European Photovoltaic Solar Energy conference held in Valencia.

The challenge set by Ford Global Technologies is to design a Model-T for the 21st Century - an inexpensive, innovative and sustainable car. Deakin University is the only Australian university and one of only five worldwide invited to participate in the Challenge, part of the celebrations for the 100th anniversary of the fabled Model T; the car that changed the 20th Century. Deakin University's 'under wraps' design for the Ford Global Challenge left for Detroit on 29th August carried by Deakin's Tim de Souza (Chief Design Engineer) and Stuart Hanafin (Portfolio Coordinator). Deakin's project is code-named T2 ('TSquared').

Drill, drill, drill. Suddenly, oil and gas exploration is all the rage on Capitol Hill. With energy prices a red-hot political issue, the Democratic-controlled Congress, in the midst of its final, three-week legislative sprint before the presidential elections, can't get enough of drilling bills. Not that most Capitol Hill watchers seriously believe that - in the absence of a major supply disruption - any substantive energy legislation will actually emerge from this frenzy and become law. "You don't pass energy bills in the heat of the campaign season," noted Frank Maisano, an energy specialist with Bracewell & Giuliani. Still, there should be plenty of action.

According to a study published in the July 14, 2000, issue of Science, one-third of the world's population is water-stressed, with 8 percent classified as severely water-stressed, including the western United States and northern Mexico, South America, India, China, Africa surrounding the Sahara Desert, and southern Africa and Australia. "Water stress" has profoundly different meanings in developed and developing countries. In Africa and many parts of Asia, it means inadequate water for drinking, sanitation and crops. In emerging economies such as India and China, it translates as an inability to meet the dietary and lifestyle aspirations of a growing middle class.

Concurrent with the release of its annual financial report, Toyota has published Sustainability Report 2008: Towards a New Future for People, Society, and the Planet. The report, which is the third since Toyota switched from environmental to sustainability reports in 2006, is structured around three themes: sustainable mobility (products), sustainable plant initiatives (manufacturing), and contributing to the development of a sustainable society-also referred to as "nurturing society."

If ever there was a car made for the times, this would seem to be it: a sporty subcompact that seats five, offers a navigation system, and gets a whopping 65 miles to the gallon. Oh yes, and the car is made by Ford Motor (F), known widely for lumbering gas hogs.

This month, Ecuador will hold the world's first constitutional referendum in which voters will decide, among many other reforms, whether to endow nature with certain unalienable rights. Not only would the new constitution give nature the right to "exist, persist, maintain and regenerate its vital cycles, structure, functions and its processes in evolution," but if it is approved, communities, elected officials and even individuals would have legal standing to defend the rights of nature.

For coal, the future of both extraction and consumption depends on new technology. If successfully deployed, innovative technologies could enable the use of coal that is unminable by gasifying it underground; reduce coal's carbon emissions; or allow coal to take the place of natural gas or petroleum. Without them, coal simply may not have much of a future. Are these technologies close to development? Are they economical? Will they work?

Can you imagine being able to produce enough water in the Sahara to grow crops there? Can you imagine harnessing sufficient quantities of solar power to supply electricity to cities in Africa and cities in Europe? Can you imagine producing a sustainable bio-fuel that doesn't impact on world food supplies? Charlie Paton, Michael Pawlyn and Bill Watts can and what's more they can imagine all these happening in the same place at the same time.

The GENI Initiative focuses on linking renewable energy resources around the world using international electricity transmission.

The search for sustainable energy will dominate the twenty-first century. This unit provides an introductory overview of the present energy systems and takes a brief look at where the world may find energy in the future - cleaner use of fossil fuels or renewable energy sources?