Nanowerk, a nanotechnology information site, has released a complete directory, the "Nanotechnology Company Directory", of companies involved in nanotechnology, with a geographical and category breakdown.

A filtration membrane frees liquids of unwanted particle and germs, keeping out anything larger than the filter's pores.

The announcement earlier this year of the renewable energy feed-in-tariff for South Africa was a progressive step by energy policy makers. The value of these tariffs even surpassed the expectations of most stakeholders involved in the renewable energy industry.

Opportunities to increase hydropower production in the U.S. and Canada are aplenty. A recent study by Navigant Consulting Inc. indicates the U.S. has the technical potential to quadruple hydropower capacity.

Poet announced the purchase of a 90 million gallon-per-year ethanol plant located just outside Cloverdale, Indiana and previously operated by Altra Biofuels.

Siemens will become shareholder (49 percent) in A2SEA A/S, a supplier of installation services for the construction of offshore wind farms. Dong Energy will continue to be the company's main shareholder. A2SEA based in Fredericia, Denmark, has a work force of about 200.

In the early years of hydropower generation, the environmental soundness of this resource rarely was questioned. In fact, early opposition to hydroelectric development primarily stemmed from land use and land ownership issues. At that time, little was done in the way of scientific studies designed to understand the effects of hydropower development and operation on rivers and their ecosystems.

It is a hulking mass of concrete, built to perform a delicate task.