Citigroup

Google Inc. (NASDAQ: GOOG) and Citigroup Inc. (NYSE: C) said Tuesday they are each providing $55 million to help finance Terra-Gen Power LLC’s 102 megawatt (MW) Alta IV wind power project in the Mojave Desert at Tehachapi, California.

It is pretty clear that the economic viability of wind and solar energy and the extent to which they will contribute significant power to the grid depends on being able to generate electricity intermittently -- when the sun shines and the wind blows -- and store it for use when it needed and/or when the sun is not shining nor the wind blowing.

China’s second-largest wind turbine manufacturer plans to raise US$1.2 billion through an initial public offering in Hong Kong.

An Atlanta-based startup company is turning human waste into biofuel at the first commercial biosolids-to-energy facility in the United States, offering a cheaper alternative to coal and a solution to managing municipal sewage sludge.