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Energy storage with iron-air batteries

January 24, 2025 By EarthWise Leave a Comment

The Cambridge Energy Storage Project in Cambridge, Minnesota will be the first commercial deployment of iron-air battery technology. Developed by startup company Form Energy, the battery system will provide 1.5 MW and 150 MWh of multi-day energy storage.

Iron-air batteries are based on the principle of reversible rusting. When discharging, the battery releases energy by breathing in oxygen from the air and converting iron metal to rust. When charging, the battery takes up electrical current that converts rust back into iron and breathes out oxygen.

An individual iron-air battery module is about the size of a washer/dryer set and contains about 50 individual cells filled with a water-based, non-flammable electrolyte. For a utility-scale system like that being built in Cambridge, modules are grouped together in enclosures and hundreds of enclosures grouped together in megawatt-scale power blocks. A one-megawatt low-density system would take up about half an acre of land. High-density systems would be capable of producing more than 3 MW per acre.

The technology has lower costs compared to lithium-ion battery technology but may be best suited as complementary with it since lithium-ion is primarily used for short-duration energy storage while air-iron can store energy for several days.

The system is expected to be operational by late 2025. Great River Energy, the operator of the system, plans to conduct a multi-year study to evaluate the system’s performance and potential for broader development.

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Minnesota co-op breaks ground on multi-day energy storage project

Photo courtesy of Form Energy.

Earth Wise is a production of WAMC Northeast Public Radio

New York Bans Some Crypto Mining | Earth Wise

December 13, 2022 By EarthWise Leave a Comment

Crypto mining, the arcane process by which cryptocurrencies are generated, is incredibly energy-intensive. As of this past summer, global electricity usage for the activity is as much as 240 billion kilowatt-hours per year, which is more than many entire countries use (for example Australia and Argentina.) Crypto mining consumes as much electricity as all the conventional computer data centers in the world.

All that energy usage is problematic for the environment, but a growing practice has made it far worse. Crypto miners have been re-powering decommissioned fossil fuel power plants to produce electricity strictly for mining operations. Doing so eliminates the climate benefits achieved by shutting down those plants.

The New York State Legislature passed a bill in June that would place a two-year moratorium on permits to re-power fossil fuel plants. It does not prevent crypto mining from existing generation sources. The bill had sat on the governor’s desk until after the recent election. But in late November, Governor Hochul signed the bill despite considerable lobbying against it.

The temporary ban was heavily opposed by cryptocurrency industry groups, to no surprise. While some states actually offer tax incentives to lure crypto mining operations, supporters of the legislation hope that New York’s action may cause others to follow its lead and stop the reactivation of old fossil fuel plants.

The two-year moratorium will allow time to properly evaluate the impact of the crypto mining industry on the state’s climate goals. It is pretty obvious that reactivating old, retired fossil fuel power plants as an energy source is a move in the wrong direction.

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New York Enacts 2-Year Ban on Some Crypto-Mining Operations

Photo, posted February 27, 2021, courtesy of Ivan Radic via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

The Future Of Animals

June 12, 2019 By EarthWise Leave a Comment

Researchers at the University of Southampton have forecast a global shift towards smaller birds and mammals over the next century.

According to the research team, small, fast-lived, highly fertile, and insect-eating animals, which can thrive in all sorts of habitats, will predominate in the future. Rodents and songbirds are examples of the so-called ‘winners.’ Less adaptable, slow-lived species, requiring specialist habitats, will be more likely to face extinction. Among the so-called ‘losers’ are the black rhino and the tawny eagle.

The researchers focused on more than 15,000 living mammals and birds and considered the following five characteristics: body mass, breadth of habitat, diet, litter or clutch size, and length of time between generations. Using this data and data from the IUCN’s Red List of Threatened Species, the researchers used modern statistical tools to project and evaluate the loss of biodiversity.

The study, which was recently published in the journal Nature Communications, predicts that the average body mass of mammals will collectively decline by 25% over just the next 100 years. Over the past 130,000 years, the average body size of mammals only declined 14%.

This substantial downsizing of animals is forecasted to occur due to the effects of ecological change. But, according to the study’s lead author, the loss of these species, which perform unique functions within the global ecosystem, may ironically wind up being a driver of change as well.

The researchers hope future studies will further explore the long-term effects of species extinction on habitats and ecosystems.

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Study predicts shift to smaller animals over next century

Photo, posted April 6, 2013, courtesy of Nic Trott via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.