Cheaper, More Reliable Solar?

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feature_solar1.jpg It’s appearing in the form of solar thermal. Instead of converting sunlight to electricity, solar thermal, also called concentrated solar power, harness the sun’s energy by converting sunlight to heat with the help of mirrors. This according to a great piece in the current Geotimes, magazine of the American Geological Institute. Some plants use curved mirrors, known as parabolic troughs, to focus sunlight onto pipes filled with circulating oil that circulate and heat steam to power a standard generator. In another system, solar power towers use large fields of sun-tracking mirrors that focus solar energy onto a receiver on top of a central tower. The intense energy concentrated onto the tower produces temperatures up to 2,732 degrees Fahrenheit, which then heats water to produce steam and drive a turbine to generate electricity. Many newer plants use insulated tanks filled with molten salt for heat storage, which provide power on cloudy days and at night—addressing the ephemeral nature of solar power.

Seems the searing West just might be the place for a lot more solar thermal.

Julia Whitty is Mother Jones’ environmental correspondent, lecturer, and 2008 winner of the Kiriyama Prize and the John Burroughs Medal Award. You can read from her new book, The Fragile Edge, and other writings, here.

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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