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.

The School of Materials, Energy, Water and Environmental Sciences (MEWES), Nelson Mandela African Institution of Science and Technology 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.

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

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.

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.


One isn’t seeing many fundamental research work papers coming out of the developed west. That makes this post’s basic and highly practical work all the more interesting.

Among those looking into geothermal energy harvesting and storage, to this author’s knowledge, this kind of work hasn’t been seen in the scientific press.

The reporting paper is not behind a paywall and gives the alert observers a quick lesson of what should be significant in examining natural heat storage materials.

A look through this team’s paper is quite illuminating! As geothermal finds more market traction this kind of know how is going to be much more important.


1 Comment so far

  1. ken BradshaK on April 16, 2024 7:25 PM

    A UK firm called Isentropic did development work on a storage system using a reversible heat pump to store electicity by heating a gravel store on one side and cooling one on the other side and then generating by reversing the process. They ran out of cash but I believe some units were installed by gas powered generators to enable them to run at peak efficency by storing the excess power this way, if demand was lower than that level and sending it to the grid later when it was needed. Newcastle University bought the rights and continued developement. See link below

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