Solar power has always had a reputation for being expensive, but not for much longer. In India, electricity from solar is now cheaper than that from diesel generators. The news - which will boost India's "Solar Mission" to install 20,000 megawatts of solar power by 2022 - could have implications for other developing nations too.

Germany's rapid adoption of solar energy has now reached the point that the solar power input could exceed demand for electricity even with all of the generators switched off, threatening to overload the country's ageing electricity grid.

In a few years, the United States is likely to be the world's largest market for solar power, eclipsing Germany, which has taken the lead as a result of strong government incentives in spite of the relative paucity of sunlight in that country. A number of factors could make growth possible in the United States--especially changes in legislation that give utilities incentives to create large solar farms.

An improved process for making solar cells could allow manufacturers to cut the amount of silicon needed in half. Since silicon can account for about three-quarters of the cost of conventional solar cells, this could significantly lower the price of solar power.

A researcher has found that aerosol seeding -- a technique proposed for combatting global warming -- could block part of the sunlight collected by solar panels for heat and electricity -- in some cases by significant amounts -- thereby compromising an important source of green energy.

Powered only by natural sunlight, an array of nanotubes is able to convert a mixture of carbon dioxide and water vapour into natural gas at unprecedented rates.

IBM today announced that it is teaming up with Harvard University to launch a new worldwide grid project aimed at finding ways to make solar energy cheaper and more efficient.

A team of US chemical engineers has extracted photosynthetic molecules from plants and attached them to thin sheets of gold, creating a photosynthesising cyborg.

Researchers at Rensselaer Polytechnic Institute have discovered and demonstrated a new method for overcoming two major hurdles facing solar energy. By developing a new antireflective coating that boosts the amount of sunlight captured by solar panels and allows those panels to absorb the entire solar spectrum from nearly any angle, the research team has moved academia and industry closer to realizing high-efficiency, cost-effective solar power.

The Army says it wants to build what could be the world's most powerful solar power plant, as part of a far-reaching effort to cut back on the service's dependence on fossil fuels. The question is whether the Army will actually make good on its green promises.