Green Tech

Tesla Motors today detailed measures to prevent a full discharge of the batteries in its forthcoming Model S, saying drivers of the electric sedan would have to be particularly negligent to cause a costly battery replacement.

The company published a response to a blog earlier this week that recounted the problem of "bricked" Tesla Roadster batteries. The blog claimed that five owners of the Roadster electric sports car allowed their batteries to be completely discharged, rendering them inoperable.

Tesla on Wednesday did not deny the stories of Roadster battery problems but noted that Roadsters can remain unplugged for several weeks … Read more

An engineering company in Italy has thought of a way to boost solar panels' production with concentrators while not taking up valuable land: put them on rafts.

Scienza Industria Tecnologia (SIT) this week detailed the solar generating system called Floating Tracking Cooling Concentrator, which is being tested in Italy and South Korea. The research company's hope is that these solar concentrators will be used on small lakes or artificial reservoirs on farms and quarries.

There are already solar arrays put on ponds, including a winery in California. But SIT is trying to use the water as an advantage for … Read more

Imagine if Google Earth could take users under the ocean. People on laptops sitting hundreds of miles away from any body of water could dive down and spot colorful reef fish, coral forests, sea snakes, and rare turtles. A program just like this was officially announced today.

In a partnership with Google, the global insurance company Catlin Group Limited and nonprofit Underwater Earth launched the Catlin Seaview Survey. The goal is to let people explore the ocean from afar and also carry out the first detailed study about the composition and health of coral reefs. The mapping expedition is expected … Read more

The first 35 miles or so that you drive in a fully charged Chevrolet Volt are emissions-free, but until now, that hasn't been good enough to make it eligible for a highly coveted Clean Air Vehicle Decal in California. Chevrolet has added a Low Emissions Package to the Volt that lets it achieve the California Air Resources Board's Advanced Technology Partial Zero Emissions Vehicle rating (AT-PZEV).

High-occupancy vehicle (HOV) lanes in California require two or three occupants in the car to drive in the faster, less congested lanes. However, certain alternative fuel vehicles are approved for green or … Read more

If you've invested over $100,000 into a Tesla Roadster, you might want to sign up for an alert to avoid your battery dying.

Electric-car blogs have been buzzing today over a report about a potential problem with Tesla Motors' electric cars that could turn an expensive battery pack into a "brick."

The Understatement blog said that five Roadster owners had their battery charges go to zero and that the only recourse was to replace the $40,000 battery pack. In the one case cited, the batteries died after six weeks of being idle and in another … Read more

The distributed sensor revolution is coming to office buildings, starting with overhead lights, according to startup Enlighted.

The Sunnyvale, Calif.-based company today detailed the energy savings of some its first corporate customers who are using its computerized lighting controls. Enlighted said that customers, including Google, Turner Broadcasting, and Interface Global, have saved on average 60 percent on lighting energy. The return on investment, which depends on the price of electricity, is about two years, according to the company.

Rather than build a more efficient light source, Enlighted and a few other lighting startups are designing better controls. Automatically adjusting … Read more

Toyota appears to be doubling down on its hybrid bet. In addition to the world premiere of the Toyota Yaris hybrid, the auto manufacturer will show off a new affordable hybrid city car at the 2012 International Motor Show in Geneva next month. The company released a sketch of the concept before the reveal.

You may think that the pint-sized Yaris Hybrid and the Prius C should already count as city cars, but it appears that Toyota has something even smaller and lighter up its sleeve. Not much has been shared about the car in advance of the world premiere, … Read more

On the second stop of its world tour, the Toyota FCV-R fuel cell concept vehicle will make its European premiere at the Geneva auto show next month.

The hydrogen-powered concept debuted at the Tokyo Motor show late last year. Few details about the FCV-R were shared, but the compact car seats four and has a cruising range of about 434 miles on a full tank.

Toyota is currently holding field trials of the Highlander Fuel Cell Hydrogen Hybrid Vehicle (FCHV) in the U.S. Although it's not clear what will become of the hydrogen-powered SUV, the FCV-R concept is … Read more

For the most part, solar panels can safely be ignored and simply keep turning your meter backwards. But thanks to some local squirrels, I realized the perils of not regularly monitoring solar panels' output.

These days, it's not difficult to view the electricity generated by solar photovoltaic panels online. And homeowners are increasingly choosing to lease panels, rather than buy them upfront. That means a solar installer or financing company will own the panels and they'll have a financial interest--in the form of renewable energy credits--to monitor rooftop panels' output.

When I had my PV panels installed four … Read more