Rocks: The Unexpected Powerhouse of Sustainable Solar Energy Storage

Rock Solar Lens Flare Effect

The future of sustainable energy storage might be found in commonplace materials such as rocks, specifically soapstone and granite, in combination with solar power, according to a study published in ACS Omega.

Researchers from Tanzania have found that common rocks, specifically soapstone and granite, may be ideal for thermal energy storage (TES), which involves storing solar heat for later use.

The next generation of sustainable energy technology might be built from some low-tech materials: rocks and the sun. Using a new approach known as concentrated solar power, heat from the sun is stored then used to dry foods or create electricity. A team reporting in ACS Omega has found that certain soapstone and granite samples from Tanzania are well suited for storing this solar heat, featuring high energy densities and stability even at high temperatures.

Energy is often stored in large batteries when not needed, but these can be expensive and require lots of resources to manufacture. A lower-tech alternative is thermal energy storage (TES), which collects energy as heat in a liquid or solid, such as water, oil or rock. When released, the heat can power a generator to produce electricity.

Rocks such as granite and soapstone are specifically formed under high heat and found across the globe, which might make them favorable TES materials. However, their properties can vary greatly based on where in the world they were formed, possibly making some samples better than others. In Tanzania, the Craton and Usagaran geological belts meet, and both contain granite and soapstone. So, Lilian Deusdedit Kakoko, Yusufu Abeid Chande Jande, and Thomas Kivevele from Nelson Mandela African Institution of Science and Technology and Ardhi University wanted to investigate the properties of soapstone and granite found in each of these belts.

Granite and Soapstone Samples

These granite (left) and soapstone (right) samples could help store heat from the sun to produce electricity. Credit: Adapted from ACS Omega, 2023, DOI: 10.1021/acsomega.3c00314

The team collected several rock samples from the belts and analyzed them. The granite samples contained a large amount of silicon oxides, which added strength. However, the Craton granite contained other compounds, including muscovite, which are susceptible to dehydration and could make the rock unstable at high temperatures. Magnesite was found in the soapstone, which conferred a high density and thermal capacity.

When heated to temperatures over 1800 degrees Fahrenheit, both soapstone samples and the Usagaran granite had no visible cracks, but the Craton granite fell apart. Additionally, the soapstone was more likely to release its stored heat than the granite.

In all, the Craton soapstone had the best performance as a TES, able to absorb, store and transmit heat effectively while maintaining good chemical stability and mechanical strength. However, the other rocks might be better suited for a lower-energy TES application, such a solar dryer.

The researchers say that though further experiments are needed, these samples show good promise in being a sustainable energy storage material.

Reference: “Experimental Investigation of Soapstone and Granite Rocks as Energy-Storage Materials for Concentrated Solar Power Generation and Solar Drying Technology” by Lilian Deusdedit Kakoko, Yusufu Abeid Chande Jande and Thomas Kivevele, 17 May 2023, ACS Omega.
DOI: 10.1021/acsomega.3c00314

The authors acknowledge funding from the Partnerships for Enhanced Engagement in Research under the National Academies of Sciences, Engineering, and Medicine; and the United States Agency for International Development.

3 Comments on "Rocks: The Unexpected Powerhouse of Sustainable Solar Energy Storage"

  1. John-Paul Hunt | June 11, 2023 at 3:58 pm | Reply

    Duh. So long as it’s not ‘dead dirt’ you got a rock reactor safer then nuclear, again in theory.

  2. Frosted Flake | June 12, 2023 at 6:35 pm | Reply

    Two problems with concentrated solar power. 1/ It’s gigantic, and has to be to work at all. 2/ It kills lots of animals. First, to get them out of the way so it can be built. Then, because they get in the way, because they think they are flying toward water. Because that is what it looks like. They are never going to learn it’s NOT water, because learning it’s not water is what kills them. One more thing… no one has ever made any money at this. That means there is no reason to do it. Unless you want to kill animals, and lose money.

  3. Nicholas Jones | June 13, 2023 at 4:05 am | Reply

    One would think with all that ill-gained, hoarded fossil fuel money being put out there to undermine common sense and what passes for democracy, they could find more intelligent trolls

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