JUL 26, 2018 4:47 PM PDT

Molten Salt-the "Seasoning" Renewable Energy Desperately Needs

WRITTEN BY: Daniel Duan

The scheme of a molten salt-based energy storage facility (Alphabet "X" division)

The recent buzz about the Bill Gates' Breakthrough Energy Ventures taking over an energy project of Alphabet Inc, the parent company of Google has brought the molten salt technology back into the limelight again.

Alphabet Inc's secretive X division conducts secretive and innovative research projects, with previous works like Google Glass and drone delivery technology. One of recent their idea, known as project Malta, is to use heat-sensitive salt as a measure to store "excessive" electricity from renewable sources such as solar and wind farms.

The peak output hours for solar panels and wind farms do not align well with the electricity demand. And both types of generators continue producing energy even when the need is low. That's why a lot of the energy went to waste. For example, California lost hundreds of thousands of megawatt hours of electricity generated by renewable sources due to this cause. If only there's a way to efficiently and cost-effectively store the extra energy. Enters the molten salt.

The word "molten" means liquefied by heat, the hot lava fresh out of a volcano would be the perfect example. Molten salts usually come in the form of fluoride, chloride, and nitrate. They are solid at standard temperature and pressure but starts melting when the temperature hit mid-200°F and becomes completely liquid past 550 °F. That's why they are the ideal candidates for thermal storage, a method to stockpile energy through thermodynamic processes.

At the off-peak hours, the electricity from solar panels or wind turbines can be used to heat up and melt salt, which can be kept in an insulated tank for storage. When electricity from solar or wind cannot keep with the demand, the liquefied salt can then be used to produce superheated steam and drive a conventional generator to pump up more electricity.

This thermal storage is commonly used in molten salt power plant. Solar Two is a solar thermal power plant based in the Mojave Desert, United States. During its operation from 1995 to 1999, the project had successfully utilized molten salt to store thermal energy collected from thousands of reflecting panel.

According to a report from Bloomberg, the Malta team has been testing a prototype of a molten salt-based thermal storage system. Last year, they announced their intent to seek partners and investment to build and operate a commercialized facility by 2024. The news from Breakthrough Energy Ventures couldn't have come at a better time.

24/7 Concentrated Solar Thermal Power plus Molten Salt Storage (100pcRenewables)

Source: MIT Tech Review/Bloomberg

About the Author
  • Graduated with a bachelor degree in Pharmaceutical Science and a master degree in neuropharmacology, Daniel is a radiopharmaceutical and radiobiology expert based in Ottawa, Canada. With years of experience in biomedical R&D, Daniel is very into writing. He is constantly fascinated by what's happening in the world of science. He hopes to capture the public's interest and promote scientific literacy with his trending news articles. The recurring topics in his Chemistry & Physics trending news section include alternative energy, material science, theoretical physics, medical imaging, and green chemistry.
You May Also Like
JUL 19, 2020
Chemistry & Physics
Did interstellar organic material form water on Earth?
JUL 19, 2020
Did interstellar organic material form water on Earth?
A recent study published in Scientific Reports sheds light on how our planet’s water could have first come to be. ...
AUG 04, 2020
Chemistry & Physics
They're Serious: Ig Nobel-Inspired Researchers Re-examined Penguin's Bodily Fluid Dynamics
AUG 04, 2020
They're Serious: Ig Nobel-Inspired Researchers Re-examined Penguin's Bodily Fluid Dynamics
If this year has been nothing but stress and you are looking for a venue for some "serious" laughter, this is ...
AUG 21, 2020
Chemistry & Physics
MIT Scientists Found the Causes Behind Dull Blades
AUG 21, 2020
MIT Scientists Found the Causes Behind Dull Blades
The reason why we replace our shaving blades so often is because no matter how sharp they start as they eventually get d ...
SEP 01, 2020
Chemistry & Physics
New printing process turns paper into a keyboard interface
SEP 01, 2020
New printing process turns paper into a keyboard interface
Imagine taking a piece of paper from your notebook and turning it into a keyboard. Can’t visualize it? Well, now y ...
SEP 04, 2020
Microbiology
Researchers Discover a Way to Use Microbes to Help Make Plastic
SEP 04, 2020
Researchers Discover a Way to Use Microbes to Help Make Plastic
Researchers have discovered that some bacteria can make ethylene in a way we never knew about; microbes that metabolize ...
SEP 10, 2020
Chemistry & Physics
Reprogramming Virus to Build Better Li-ion Batteries
SEP 10, 2020
Reprogramming Virus to Build Better Li-ion Batteries
There's no doubt that the word "virus" is currently on everyone's mind. However, there's a lot mor ...
Loading Comments...