Green Technology

Left unchecked, friction between the moving parts of an engine would turn it into an inert piece of sculpture. Clean, filtered oil keeps the parts moving with relatively little resistance.

By William Harris

Ever wish the lawn would just mow itself? Well, the Husqvarna Automower is about as close as you'll get to that dream -- with the added bonus of using the sun for power.

By Maria Trimarchi

A little friendly competition never hurts to stir up motivation, right? That's the idea behind Tweet-A-Watt, a power-monitoring gadget that connects your power usage to your Twitter account.

By Julia Layton

From toothbrushes to iPhones, we fill our lives with a seemingly unending string of gizmos -- all of which depend on electricity to give us what we need to make it through the day. What if you could generate that power?

By Robert Lamb

Sure, your hair dryer or toaster sucks up a lot of kilowatt-hours during the short time it's on, but what are the truly big drains on your home energy budget?

By Julia Layton

While rebates and tax credits have put solar power within reach for many homeowners, it's still an expensive undertaking. How do you make sure you get your money's worth?

By Julia Layton

A 10-minute shower can seem like nothing on a cold, sleepy morning, but it might cost you 50 gallons of water (or more). Is there a way to limit the volume of water you use?

By Julia Layton

The Duke Smart Home isn't your typical residence hall. It's a live-in laboratory, complete with LEED Platinum certification. What's inside (and out) that makes it so special?

By Maria Trimarchi

There are two main ways of generating energy from the sun. But one -- solar thermal technology -- is really poised to take off as a clean, reliable form of alternative energy.

By Maria Trimarchi

Did you ever make a potato clock as a kid? If so, you already understand the basic principles that make a soil lamp work.

By Julia Layton

Energy efficiency is starting to rank right up there with speed and power in terms of desirable attributes for a computer. What are five of the most energy-efficient computers on the market?

By Maria Trimarchi

The Northeast Blackout of 2003 left millions without power and cost approximately $6 billion. Experts believe we can avoid future blackouts by storing energy along the U.S. electric grid.

By Susan L. Nasr

Why would Los Angeles and Pittsburgh set out to convert a combined 180,000 traditional high-pressure sodium and mercury-vapor street lamps to LED lighting?

By Jacob Silverman

How much energy does your TV use when it's plugged in all night? How much power is your stereo system draining from the socket monthly? The Kill A Watt and other energy monitors help you find out.

By Julia Layton

Cellulosic ethanol can be made from any old stem, leaf or tree trunk. Farm wastes, grass clippings and recycled newspaper will work, too. So when can we expect this alternative fuel to arrive at gas stations?

By Susan L. Nasr

Children love to play, so why not harness the energy of their motion to help support a community. How does the PlayPump convert the push of a merry-go-round into clean water?

By Stephanie Watson

Gasification could represent a second chance for coal. Will this old technology, which can run on coal or biomass, get a new life as one of the most important energy alternatives of the future?

By William Harris

Sometimes you need to reinforce roads or retain walls without breaking out the concrete and rebar. That's where a simple, ingenious technology comes in.

By Julia Layton

That's not just any mud. That's a fossil fuel that's stashed away in huge quantities in deposits all over the Earth's crust. Could that frozen fuel also heat up the planet?

By William Harris

Alternative energy usually means something is mined, refined, collected or grown. But gravity-powered floor lamps rely only on a force of nature -- and the strength of a human being.

By Julia Layton

Photovoltaic solar panels are like windows -- they build up a coating of grime that requires a good cleaning from time to time. What's the alternative to climbing the roof with a squeegee and bucket of suds?

By Maria Trimarchi

Solar energy is clean and plentiful. There's one big problem, though: The sun doesn't shine all the time. Is there a way to keep solar plants powered up through the night?

By Julia Layton

You know what geothermal energy is -- heat from the Earth. Could a new twist on geothermal power help countries achieve energy independence?

By Susan L. Nasr

Without a doubt, plastic is useful. It's also everywhere — filling up landfills and recycling bins. These 10 twists on the common polymer are trying to change that reality.

By Maria Trimarchi, Patrick J. Kiger & Vicki M. Giuggio

Plants produce energy so perfectly: converting sunlight, carbon dioxide and water into power and emitting nothing harmful in the process. Can we imitate such an elegant system?

By Julia Layton