Latest Articles

‘Dell of solar’ seeks to make it cheap and user-friendly to get rooftop PV

Today, a company called Sungevity announced the availability of what they’re calling the cheapest solar system in the world: a rooftop solar panel system, fully installed, for $2,000. That’s as much as I paid for my computer. For that price, the average home will save $21,000 in electricity over 25 years — a 45 percent […]

Enviros’ border-fence appeal turned down by Supreme Court

Homeland Security officials can continue to waive environmental laws to speed construction of a fence on the U.S.-Mexico border, after the U.S. Supreme Court declined to hear an appeal by Defenders of Wildlife and the Sierra Club. The groups had argued that the eco-law-waiving power given to Homeland Security chief Michael Chertoff in 2005 was […]

Prez candidates tout new policies to lower oil prices

John McCain and Barack Obama have both called for changes to national energy policy in recent days that they said would eventually help lower oil and gasoline prices. On Sunday, Obama called for closer regulation of oil speculators that have been a major force contributing to the rise in oil prices. He said his plan […]

A Cambridge physicist’s cooling summer treat

Download "Sustainable Energy -- Without the hot air" for free. You'll be glad you did.

Don Lee Farms veggie patties are the shizzle

I’m probably going to get in trouble for this, since it’s not organic and it comes from some anonymous frozen-food manufacturer, but the discovery of a veggie pattie that doesn’t suck is good news that must be shared with the world. As you’re probably aware, most "veggie burgers" taste like cardboard. Most real veg-heads I […]

I think Friedman is upset with Bush

The Mustache kicks ass today. He says it’s “hard for [him] to find the words to express what a massive, fraudulent, pathetic excuse for an energy policy” Bush is backing, but he manages fairly well. Extra kudos for highlighting the absurd refusal of Republicans to renew the PTC and ITC. One ommission: he doesn’t mention […]

California officials yank controversial urban spraying plan

California officials have announced that they will not spray the urban Bay Area with a pheromone this summer, delighting activists who had campaigned strenuously against the plan. The pheromone with the ominous name CheckMate LBAM-F keeps the crop-gobbling light brown apple moth from reproducing, but also has been linked to complaints of respiratory trouble in […]

Solar thermal can save us, but it needs public clamor

[Editor's note: When this post was originally run, the phrase "100 miles by 100 miles" was changed to "100 square miles," which is very different. The article has now been corrected (or rather, unmiscorrected) and the appropriate intern flogged; our apologies to Ted and Alex.]

This post was coauthored with Alex Carlin, organizer of Let's Go Solar and instigator of the recent Environment America study (PDF), "On the Rise: Solar Thermal Power and the Fight Against Global Warming."

Every day more people are finally hearing about what Joe Romm calls "the solar power you don't hear about" -- solar thermal power, utility-scale arrays of mirrors that create heat (and then electricity) so efficiently that they can do everything a coal plant can do except melt the South Pole.

Without any special promotion, solar thermal (concentrating solar power, or CSP) will eventually grow into a major supplier of our electric grid, simply because, according to the California Energy Commission, it is an increasingly economical technology with per kilowatt-hour costs estimated to be 27 percent lower than new integrated gasification combined cycle (IGCC) coal plants with carbon capture-and-storage -- 12.7 cents/kWh for CSP versus 17.3 cents/kwh for IGCC plus CCS.

The technology is moving forward, with five plants already operational, eight under construction, and 20 more announced. Several of these plants include on-site thermal storage, an option that makes CSP a reliable source of baseload power.

The problem is the timeline of global warming. If we take seriously what the science is telling us, we must conclude that CSP has arrived in the nick of time. James Hansen's latest team effort (PDF) tells us that earth has had many eras with ice-free North and South Poles. The report concludes: "If humanity wishes to preserve a planet similar to that on which civilization developed ... CO2 will need to be reduced from its current 385 ppm to at most 350 ppm." On the other hand, if we continue to burn coal for our electric power, those poles will melt, sending sea levels so high that cities like New York and Miami would have no chance to survive.

You probably already knew that, but did you know this? Just 100 miles by 100 miles of CSP installations would supply 100 percent of the U.S. electric grid. That's being conservative: Ausra's chairman David Mills pegs the figure at 92 miles by 92 miles. Put similar installations in Morocco for Europe and the Gobi desert for China and we have our golden opportunity -- our last chance -- of keeping those poles under ice and our cities above water.

How much land is 100 miles by 100 miles?

Obama sweet-talks Florida, criticizes McCain’s shift on off-shore drilling

Democratic presidential contender Barack Obama responded to John McCain’s call to end the moratorium on off-shore drilling in a press appearance in Chicago on Friday and made his own appeal to the voters of Florida: When I am President, I will keep the moratorium in place and prevent oil companies from drilling off Florida’s coasts. […]

Lake Chad now one-tenth of its 1972 size

Satellite images show Lake Chad one-tenth the size it was in 1972, not even 40 years ago. Lake Chad used to be the world's sixth-largest lake, but its resources have been diverted for human use or affected by rainfall such that its been almost entirely depleted in a very short amount of time: