Tidal power

Wind, water and solar technologies can provide 100 percent of the world's energy, eliminating all fossil fuels. Here's how

Two pilot projects are testing the potential of "salt power," a renewable energy that relies on the differing salinities at river mouths to make watts

The first commercial test of light-wave telephone service is under way in Chicago. The signals are dispatched over glass fibers in pulses generated by tiny solid-state light sources

Solar-thermal plants throughout the desert would send power across the Mediterranean Sea

Northwestern states want "hydrokinetic" technologies in the water soon

A start-up proposes forests of fake trees with "leaves" that soak up sunshine and flutter in the breeze to generate clean solar and wind power. Could it just be crazy enough to work?

The president and CEO of Cameco Corporation, a supplier of uranium, weighs in on the hurdles facing his industry

A satellite that reaps the sun's energy in space and beams it down to Earth for use as electricity may leave the realm of sci-fi and edge closer to reality this week following an energy deal in California

Canceled projects and technological challenges postpone harnessing the power of waves and tides

If efficiency improvements and incremental advances in today's technologies fail to halt global warming, could revolutionary new carbon-free energy sources save the day? Don't count on it—but don't count it out, either

The economic stimulus package is expected to include billions for research and development of carbon capture and storage

Dartmouth students bring light to once-dark homes in a remote Rwandan village