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People say we're running out of energy. That's only true if we stick with these old 19th century technologies. We are awash in energy from sunlight.

 

Ray Kurzweil

 

Scientists challenge economics of storing renewable energy

RATE THIS! +65
Posted in Science on 13th Sep, 2013 04:12 AM by AlexMuller

True or false: solar and wind power are freely available and clean, and thus should always be stored when they generate more energy than the grid can use?

 

It's easy to assume that renewable energy should never be turned off, but scientists at Stanford have done the math to find the break-even point where storing energy is better than "wasting," or curtailing, that energy, and their findings aren't necessarily as you'd think.

 

Though curtailing energy production results in an immediate energy loss, avoiding that loss through energy storage also requires an investment of energy, either through manufacturing batteries or building infrastructure. However, not all storage is the same, nor are the energy demands of creating wind and solar farms equivalent. By expressing all the energy in equivalent terms, the team could compare the return of energy garnered from solar and wind with the energy stored in batteries, per unit of energy required to build either (expressed as EROI for return of energy, and ESOI for the storage of energy).

 

Because solar panels are more energetically expensive to produce than wind turbines, the EROI values differ by a factor of ten. When looking at various types of batteries, even more efficient flow batteries, all had much lower ESOI values than the geologic energy storage methods studied, which were compressed air energy storage and pumped hydroelectric storage.
 
Factoring in these differences, the study's results show it’s currently always a better option to store solar energy because of the high energetic cost to recoup. However, the only storage options that are always better than curtailment of wind are geologic methods, with battery storage becoming better than curtailment depending on the fraction of energy being used in the grid instead of being stored or curtailed. In the graph below, you can read the ϕ in the bottom axis as representing that fraction. At the far right, if 100 percent of the energy is being curtailed or stored (i.e., none is going to the grid), then storing it is just barely a better option with any battery type. But at other rates it depends on the battery type.


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Comments

Author: Guest
Posted: 2013-09-13
+6
Thanks to the researchers at Stanford for this study. The details of the research are clear and understandable. The economics of this one are not hard to understand. One would think though that under any circumstance it would be better to store energy but that per this article is not necessarily true. Reply
Author: Guest
Posted: 2013-09-13
+6
The study's results show it’s currently always a better option to store solar energy because of the high energetic cost to recoup. The problem apparently is the cost of the storage. Reply
Author: Guest
Posted: 2013-09-13
+6
Apparently from this study, it seems counter-intuitive that wind energy should be so cheap yet benefit in most cases from curtailment. It just seems that it should be the other way. Reply
Author: Guest
Posted: 2013-10-26
+0
HeLGCZ Thanks so much for the article post.Much thanks again. Really Cool. Reply


 

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