Last year, Google invested more than $915 million in clean energy projects — solar, wind and transmission.

That’s a lot of money, even for Google, which had $38 billion in revenues in 2011. The investments don’t appear to be core to the company’s mission of organizing information, and they have attracted criticism, as well as some careless reporting, implying that the Internet giant is exiting the alternative energy business.

As solar panel manufacturers try to harvest more of the sun’s energy for less, they face increasingly diminishing returns. At roughly $1 per watt, the cost of solar modules now represents less than a third of the total cost of commercial solar installations. To cut the total cost of solar power—currently $3.00 to $3.50 per watt—bigger gains will have to come from improvements in the power electronics, wiring, and mounting systems required for solar installations.

According to a study conducted by ICF, a consulting firm for the US Department of Defense, surplus land at four military bases in the Mojave desert in California could be capable of producing up to 7 Gigawatts of solar power. These bases include, the Edwards Air Force base, Fort Erwin, China Lake and Twenty-nine Palms. Some 37,873 acres of land is available for setting these solar power plants, without impacting the space needs of the military for its ongoing operational needs or for potential future needs. The type of solar power plant to be installed, whether silicon flat panels or solar concentrators, has not yet been determined. If the go-ahead happens, power plant construction could commence by 2015.

Italy and France have joined forces to create the “Astonyshine” 100 percent solar home concept as part of the 2012 Solar Decathlon Europe. The international competition is open to universities from around the globe and promotes research into the development of efficient housing. Astonyshine is a modern reinterpretation of the classic Mediterranean villa, and is the result of the combined efforts from Polytechnic of Bari (Italy), University of Ferrara (Italy), Ecole Nationale Superieure d’Architecture Paris-Malaquais (France) and Ecole des Ponts ParisTech (France).

Some more astonishing stats on the progress Germany is making on solar power thanks to good, steady and predictable renewable energy policy: Greentech Media shares the astonishing fact that in the month of December alone Germany installed 2 GW of solar PV. For the whole of 2011, Germany installed 7 GW.

The US managed to install 1.7 GW in the same time period—which isn’t to knock US installation rates so much as to further highlight the massive Germany push to install more PV before the feed-in tariff for it drop as planned.

Renewable resources and non renewable resources are at two ends of a tug-of-war battle. While the latter is presently being used to an exhaustive extent, the former is still trying to find a prominent place in the list of energy sources. Conventional sources like coal have been used for a number of decades to power industries and homes. Its abundance and cheap cost is what propelled many to turn to it in the first place. The Industrial Revolution of the 18th and 19th centuries saw huge amounts of coal being used to drive countries like Britain to the forefront of progress. Earlier, this natural resource was used in small quantities and coal could be mined from close to the surface of the earth. However, as demands increased, there was a need to drill ever deeper.

India seems to aim higher and think bigger in terms of its solar energy: from a set goal of 20 GW, the National Solar Mission grew its prospects to 33.4 GW all around the country, according to a report by Bridge to India.

The first step is to have 14.15 GW by 2018. By then, solar energy will have its own respected place on the national grid and more progress will have been made regarding the emissions level.

This will be possible due to the increased production of PV cells and the possibility of cheap imports from China. The final cost is estimated at around 40% less than what it is now.