A Power Purchase Agreement, or PPA, is a long-term contract to buy power from a specific energy provider. Solar PPAs are agreements between a provider and a customer to purchase on-going solar power at a long-term rate, often equal to or less than market rates.


Green Plug believes the time has come for a reusable, multi-port power supply that can provide a universal power interface for all electronic products. The company is also taking a stand for setting a worldwide DC power standard.


The marine energy industry has a long way to go but ongoing research and government support should lead to improvements making these technologies more economically attractive in the future. Combined with intensifying company activity in this field, Europe is poised to be the place to watch in the marine energy arena of the future.


The only way to raise wind loading on the blade in the vertical turbine with a horizontal axis, without causing their destruction and worsening their aerodynamic quality, is increase in quantity of blades and a fastening their ends by a ring in a shape of an airfoil.


Any industry has indeed the right to look out for its interests. However, will it not look ridiculous if the so-called tough emissions standards hit the streets (pun intended) at the same time as top-notch top-range luxury vehicles such as the Mercedes S-class, already operating well within compliance?


European waste management market is continuing to restructure and reform. The ongoing move away from landfill is continuing to attract technological innovation and the current leaning towards waste to energy in many parts of Europe is attracting major capital investment with improving opportunities for returns.

The World's First Eco-Friendly Airliner

Boeing's work to make the 787 Dreamliner the world's first eco-friendly airliner have inspired engineers and flight designers across the globe to design more fuel efficient airplanes.

California Clean Tech Open 2007 Winners Announced

Six clean tech startups each awarded $100,000 in prizes

Case Study - Geothermal Energy System

Although they invested a little more capital in the installed system, the annual energy cost savings will finance the extra capital and the system will pay itself back in the next 6-8 years. In addition, they have become one of the most environmentally responsible owners in the area with an annual emissions offset equal to planting an acre of trees.

EarthToys Interview - Sun Run Electricity Package

Sun Run owns and maintains the panels, not the homeowner, eliminating the hefty upfront cost and maintenance woes. Once the system is installed, Sun Run provides monitoring, all required maintenance at no additional cost and guaranteed system performance - or your money back.

EarthToys Interview - The Community Solar Program

We have seen the solar programs serve as a source of community pride for residents and a bonding agent between neighbors. When you make a big decision like going solar as a group, it also tends to remind residents of the larger impact of their decision on the environment and the fight against global warming.

Editorial Comments

I must thank the celebrities who have brought our cause to the attention of the world. Now let's hope the momentum carries through and we actually start to see real solutions and progress taking place. We need 2008 to be the year of implementation. Time for the engineers to be set free to do what they do best ... build stuff :-)

Electric Vehicle Conversion

Large numbers of people are discovering that, with some effort and a little money, a clean, reliable beast of transportation can emerge from ones own garage. Generally referred to as EVs (electric vehicles), these self-made conversions offer low cost of operation and low cost of ownership - a winning combination.

Energy Saving Tips in the Kitchen

EEI has compiled the following top 10 cooking tips for making sure that the electric bill this holiday season looks as good as the roast.

Hydrogen Contest Returns after Two-year Hiatus

Over 100 students from four countries comprise the thirteen teams that have submitted design abstracts this year. Design ideas include waste to hydrogen, back-up and emergency power supply, fuel cell and Hydrogen ICE vehicle implementation, just to name a few.

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