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Energy performance is a relative concept.

The whole idea stinks. But generating heat and power from livestock manure is appealing. The compost is placed into an oxygen-free machine that separates the methane gas and then uses it to create electricity to power farms or transport over the grid.

Reality or virtual reality:  replacing air transport by high speed electrical rail systems

The E-Flight design team plan to build 10 battery "safe boxes" that will hold 8 Li-Poly battery packs per box. Initially for safety purposes, the battery packs must be charged individually but the long-term goal is to develop a single-plug charging system that could remain in the aircraft at all times.

The lithium ion car battery created by Tesla Motors has passed a battery of certification tests that effectively remove another hurdle in the path toward selling products. Because they can burst into flames, lithium ion batteries are classified as dangerous goods, according to Erik Toomre, Director of Manufacturing Programs. "Before we ship it to the public, we have to demonstrate that it is safe," he said.

The lithium ion car battery created by Tesla Motors has passed a battery of certification tests that effectively remove another hurdle in the path toward selling products. Because they can burst into flames, lithium ion batteries are classified as dangerous goods, according to Erik Toomre, Director of Manufacturing Programs. "Before we ship it to the public, we have to demonstrate that it is safe," he said.

Last week's news that widening a stretch of the M6 motorway will cost £3bn, or £1,000 an inch, was depressing not just because of the huge sum but for what it says about the government's spending priorities.

Last week's news that widening a stretch of the M6 motorway will cost £3bn, or £1,000 an inch, was depressing not just because of the huge sum but for what it says about the government's spending priorities.

A new version of the internal combustion engine, which could significantly cut gas consumption, might be surprisingly practical and easy to deploy, according to recent findings by researchers at MIT.

Honda's natural gas Civic GX, which debuted in 2006 in California but is now becoming available in other parts of the country, just may be the cleanest mainstream car on the road. At least the American Council for an Energy-Efficient Economy (ACEEE) thinks so. The nonprofit group . . . put the Civic GX at the top of its 2007 environmentally friendly car list, edging out Toyota's hybrid Prius. The natural gas-fueled Civic scored slightly better than the Prius on fuel economy and reduced emissions in ACEEE's battery of tests. It also scored better in terms of the pollution generated in the manufacturing processes.

The research shows that the U.S. economy has the potential to reduce annual non-transportation energy consumption by roughly 23 percent by 2020, eliminating more than $1.2 trillion in waste - well beyond the $520 billion upfront investment (not including program costs) that would be required. The reduction in energy use would also result in the abatement of 1.1 gigatons of greenhouse gas emissions annually - the equivalent of taking the entire U.S. fleet of passenger vehicles and light trucks off the roads.

A Empresa Metropolistana de Águas e Energia de São Paulo (EMAE) divulgou a intenção de criar um Atlas Eólico do Estado. O estudo fará o mapeamento por meio de oito torres de monitoramento e promete ser o mais completo do Brasil. Além dos dados sobre os ventos, haverá informações demográficas, de transporte, consumo de energia elétrica, transmissão e clima.