Science behind sand batteries

Dear EarthTalk: Could plain-ol’ beach sand be the next frontier in renewable energy?

— Paul C., Baltimore, Maryland

In our ongoing quest for sustainable energy solutions, innovative technologies are necessary to complement renewable sources like solar and wind power. One such potential breakthrough revolves around an unexpected but abundant resource: beach sand.

Sand batteries represent an emerging approach to energy storage, particularly effective in harnessing and retaining energy from intermittent sources like solar and wind. The physical properties of sand, such as its ability to store heat at high temperatures, make it an excellent medium for energy retention. This capacity is being leveraged by innovative technologies to create a more stable and reliable energy supply, as sand can efficiently accumulate and release heat as required.

The science behind sand batteries involves heating sand to high temperatures using surplus energy generated from renewable sources. This stored heat can then be converted back into energy when needed. This system capitalizes on the thermal properties of sand to create a natural battery that can offer both heating solutions and electricity generation. As National Renewable Energy Laboratory’s (NREL) Patrick Davenport notes, “Sand and concrete silos with refractory insulation are very inexpensive materials that can lead to low-cost energy storage.” A few key players currently pioneering this technology include Polar Night Energy in Finland, which has implemented a sand battery for residential and commercial heating, and EnergyNest in Norway, which specializes in thermal energy storage using similar principles.

Using sand for energy storage offers multiple benefits: it is abundant, low-cost, eco-friendly, and can store heat for long periods. This makes sand an attractive option for enhancing the stability of renewable energy systems, and providing a reliable energy supply even during times of low sunlight or wind.

Sand battery technology is currently being tested and used in various projects worldwide, not only demonstrating the viability of sand as an energy storage solution but highlighting its potential scalability and integration into existing energy infrastructures.

Developing and deploying sand battery technology on a large scale requires significant research and development efforts.

EarthTalk® is produced by Roddy Scheer & Doug Moss for the 501(c)3 nonprofit EarthTalk.

Latest News

Ann Beizer

CANAAN — It is with deep sorrow that we announce the passing of Ann Beizer, who died on Nov. 13, 2024, at the age of 80 after a courageous battle with progressive supranuclear palsy, a rare and debilitating disease that took away her ability to move, see clearly, and swallow. Ann’s strength and resilience throughout her illness was an inspiration to all who knew her, even as the disease took its toll.

Born on Sept. 12, 1944, in Washington, DC, Ann was raised in Glasgow, West Virginia, where both of her parents were school teachers. She earned a Master’s degree in counseling from West Virginia University and went on to teach high school history. Later, she led a not-for-profit organization before becoming the Director of Academic Advising at Worcester Polytechnic Institute (WPI). At WPI, Ann also served as a Project Advisor, guiding students on international work projects in Italy and Puerto Rico. Her commitment to education and mentorship earned her a prestigious Fulbright Scholarship to Germany, further advancing her career in academic advising.

Keep ReadingShow less
Dr. Fred G. Kantrowitz

SHARON — Dr. Fred G. Kantrowitz, 78, of Medfield, Massachusetts, Vineyard Haven, Massachusetts and Sharon passed away Nov. 13, 2024, at Beth Israel Deaconess Medical Center in Boston. He was the loving husband of Anne Kirby, devoted father of Gregory and William, father-in-law of Katie and Brittanny, and proud grandfather of Jack, Ava and Jameson.

Fred was born Dec. 10, 1945 in Brooklyn, New York, the son of the late Theo and Dinah (Kotick) Kantrowitz. His own health struggles as a child, intellectual curiosity and desire to help others led him to a career in medicine. Fred’s illustrious medical career was highlighted by nearly 50 years on the Beth Israel staff, more than 30 published works and a chapter as teamdoctor for the Boston Celtics. Later in his career, he developed a reputation for being the doctor to handle only the most complex cases, including long Covid.

Keep ReadingShow less
Rose Moskowitz

CANAAN — Rose Moskowitz, 98, of Geer Village in Canaan, passed away on Nov. 9, 2024. She was the loving wife of the late Bernard Moskowitz.

Rose was born Aug. 2, 1926, in New York City, the daughter of the late David and Regina (Shanker) Gunn.
Rose graduated from high school in the Bronx.

Keep ReadingShow less
Doreen B. Newton

WASSAIC — Doreen B. Newton, 76, a lifelong resident of Wassaic, died on Saturday, Nov. 16, 2024, at Kindred Hospital in Passaic, New Jersey. Ms. Newton was an assistant social worker at Taconic Developmental Disabilities Office in Wassaic, for 30 years, retiring in 2005.

Born on Nov. 24, 1947 in Sharon, she was the daughter of the late William and Doris (Shook) Barlow. She was a graduate of Webutuck High School Class of 1965. An avid reader, Ms. Newton enjoyed mystery novels and crossword puzzles. Above all, she loved her grandchildren.

Keep ReadingShow less