This time around they are contuning their solar power drive by investing in companies that will encourage the use of renewable energy. They emphasize solar power, but they are not limiting the hundreds of millions of dollars they want to invest in solar power.

“Our goal is to produce one gigawatt of renewable energy capacity that is cheaper than coal. We are optimistic this can be done in years, not decades,” Larry Page, Google’s co-founder and president of products, said in a statement.

One gigawatt can power a city the size of San Francisco.

Google is seeking to capitalize on the recent excitement among Silicon Valley entrepreneurs to apply the risk taking that computer, biotech and Internet businesses are famous for to the field of alternative energy production.

Google’s latest moves come as the price of a barrel of oil nears $100 and coal, which produces 40 percent of the world’s electricity, faces regulatory and environmental pressures that could drive up prices.

The 3 million scrapped wafers each year could be used to create solar panels to power 6,000 houses, IBM said.

“It’s a simple process but it really returns benefits on so many different levels,” Jagielski said. “Not only do we reduce our overall use of silicon, but then to be able to create a raw material for the solar panel industry is kind of a good story all the way around.”

The $1.8 million study would seek to determine how much electricity could be generated, what kind of technology would work best and whether the project makes sense economically. It would also examine the project’s possible impacts on marine life and the environment.

“A town with 55,000 inhabitants would need half a square kilometre of seabed covered with 100 buoys to power it,” says Grey.

He adds that they could be effective in the North Atlantic, from Scotland down to Portugal, along the Pacific US shoreline, from San Francisco in the US up to Vancouver in Canada, along the coast of Chile, and even in South Africa and New Zealand.

But calmer seas, such as the Mediterranean do not have enough wave height to pump the buoy.

On Monday, Bloomberg said the city will issue a request for proposals for a pilot program to install solar panels on city-owned buildings in hopes of generating 2 megawatts of solar capacity _ offsetting about 320 tons of emissions per year, equal to taking more than 50 U.S. cars per year off the streets. The city will not pay for the installation but will buy electricity from the provider.

At over a kilometer in length, the rooftop will have an area of over 57,000 square meters, of which 21,000 will be occupied by solar panels. The power installed will be of approximately 3 MW peak, which will generate over 3.6 GWh per year.

It is predicted that this design will enable it to save 15% on climate conditioning in winter, and 34% in summer, as well as saving on lighting. The facade of the office blocks is a double skin, where the external glass is hung out from staggered glass fins.

The Ontario government has approved a California company’s plan to build North America’s largest photovoltaic solar farm, the provincial energy ministry announced Thursday.

OptiSolar Farms Canada Inc. of Arthur, Ont. — a subsidiary of California-based OptiSolar Inc. — will install more than one million solar panels at four farms outside Sarnia, Ont., providing the province with 40 megawatts of power by 2010. Ontario Energy Minister Dwight Duncan said that’s enough to power 6,000 homes.

“Net metering essentially allows people to become mini-power producers. Programs vary state to state, but they are typically coupled with financial incentives that make it easier to invest thousands of dollars for photovoltaic panels, windmills or fuel cells. Since sun and wind are intermittent, customers still rely on the grid for steady service. The meter runs backward when more energy is produced than a customer consumes.”