What a World Powered by the Sun Would Look Like

The Sun powers our solar system, so could it power all our Earthly needs, too? And if it someday could, where would all those solar panels go?

Jul 29, 2014 at 12:20PM

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The Sun powers our solar system, so could it power all our Earthly needs, too? And if it someday could, where would all those solar panels go?

According to a graduate thesis by Technical University of Braunschweig student Nadine May, the number of solar panels needed to supply the entire world's energy needs would fill just 25,000 square miles – or an area only slightly larger than the state of West Virginia.

That doesn't seem like very much, unless you live in West Virginia. If the amount of solar panels needed were divided evenly in every country, they would take up just 127.5 square miles in each. (Granted, that would be asking a lot of smaller countries like Bahrain, whose total land measurement is only 295 square miles.)

Area required.
Credit: LandGenerator.org 
Caption: Amount of land needed to power the world with solar panels by the year 2030

So larger countries would have to host more panels – maybe even on a per-capita basis. This graphic is a good projection of a possible disbursement of panels worldwide for energy demands in the year 2030. The graphic places about a quarter of all panels in the baking hot Saharan Desert.

Why not just put all of the panels in the sunny Sahara or someplace similar? A few reasons. The more evenly distributed the panels are, the better; localization would help diversify infrastructure, reduce the inevitable power losses that occur over long transmission distances, and allow more countries to share the burdens of installation and maintenance.

There's also the argument against centralizing our main energy source, which is where the world is currently with oil. According to this article, out of the current top 10 leading oil-producing countries, at least two are in current conflict and the political situation in five of the others is considered "unstable."

Throughout history, the desire for commodities – oil, metals, food, etc. – has been a frequent cause of wars. So while it's interesting to imagine the land space needed to build enough solar panels to power the world, it's even better to imagine every country achieving, or at least approaching, energy autonomy thanks to a renewable source like solar power.

While sunny countries would have an advantage, northern hemisphere countries like Germany are proving that solar power is just as viable. Even with only about 65 days of sunlight per year, Germany has been called the world's "unlikely leader in solar power." This past June, Germany got more than half of its total energy from solar power. Solar power generation is up by 34 percent this year.

But while there's a lot of good news about the potential of solar energy to scale up, the reality is that the technology to enable the creation of a worldwide solar energy grid isn't here yet. Current solar panels can only capture 20 percent of the Sun's energy, and to become a viable, wide-scale source of energy for the world, they would need to capture much more than that.

Our power needs aren't going anywhere, though, and neither is the Sun. So it's an idea whose time may yet come.  


Written by Amy Gleich of Oilprice.com

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4 in 5 Americans Are Ignoring Buffett's Warning

Don't be one of them.

Jun 12, 2015 at 5:01PM

Admitting fear is difficult.

So you can imagine how shocked I was to find out Warren Buffett recently told a select number of investors about the cutting-edge technology that's keeping him awake at night.

This past May, The Motley Fool sent 8 of its best stock analysts to Omaha, Nebraska to attend the Berkshire Hathaway annual shareholder meeting. CEO Warren Buffett and Vice Chairman Charlie Munger fielded questions for nearly 6 hours.
The catch was: Attendees weren't allowed to record any of it. No audio. No video. 

Our team of analysts wrote down every single word Buffett and Munger uttered. Over 16,000 words. But only two words stood out to me as I read the detailed transcript of the event: "Real threat."

That's how Buffett responded when asked about this emerging market that is already expected to be worth more than $2 trillion in the U.S. alone. Google has already put some of its best engineers behind the technology powering this trend. 

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KPMG advises we're "on the cusp of revolutionary change" coming much "sooner than you think."

Even one legendary MIT professor had to recant his position that the technology was "beyond the capability of computer science." (He recently confessed to The Wall Street Journal that he's now a believer and amazed "how quickly this technology caught on.")

Yet according to one J.D. Power and Associates survey, only 1 in 5 Americans are even interested in this technology, much less ready to invest in it. Needless to say, you haven't missed your window of opportunity. 

Think about how many amazing technologies you've watched soar to new heights while you kick yourself thinking, "I knew about that technology before everyone was talking about it, but I just sat on my hands." 

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David Hanson owns shares of Berkshire Hathaway and American Express. The Motley Fool recommends and owns shares of Berkshire Hathaway, Google, and Coca-Cola.We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

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