The main challenge with current battery technologies is that they fall under the short-duration energy storage (SDES) spectrum, lasting four hours or less per charge. In terms of grid-level energy requirements, they are not a viable replacement for coal and diesel plants. What is a viable replacement is the holy grail of clean energy tech, long-duration energy storage or LDES, which, in theory, should deliver energy for 24 hours to several days on a single charge. Pundits believe such batteries, supplied at scale and affordably, will completely replace fossil-fuel-powered power plants.
Leading the charge into this bold future is e-Zinc, a red-hot Canadian startup currently on a fundraising spree that has developed a zinc-based LDES battery solution that might just tip the balance towards full-scale renewable energy adoption.
e-Zinc’s resilience solution at a commercial / industrial building site
At the time, zinc-based batteries were designed as another short duration system, like lithium-ion or lead-acid. However, Dr. Zhang figured out a way to store energy in physically-free zinc metal, unlocking the ability for economically viable long-duration storage. This discovery was the impetus to start e-Zinc, which Dr. Zhang founded and led for the first five years, culminating in the completion of its first successful laboratory demonstration of the functionality and electrochemistry of the technology.
The next step in e-Zinc’s journey was to start commercializing the technology, and this required an expanded executive team that would lead fundraising efforts. “I was hired as the new CEO to lead the commercialization of the technology, and our first order of business was raising money,” Larsen shares. “We closed a $3.5 million seed round in 2019, and we were also very fortunate to win a string of competitions and grants totaling about $7 million.”
The company’s two notable wins were Breakthrough Energy Solutions Canada, backed by Bill Gates’s Breakthrough Energy Ventures, and a global solicitation for non-lithium battery technologies by the California Energy Commission. Besides these wins, e-Zinc has attracted an A-list list of investors, including Toyota Ventures and Italy’s Eni, alongside lead investor, US-based Anzu Partners.
With so many investors lining up to hand e-Zinc fistfuls of money, how interesting can a small battery startup be? According to Larsen, very interesting, and it all comes down to the technology they have developed.
“If you’re running your laptop or cell phone at full capacity, it will only last a few hours. Our technology lasts multiple days,” he explains. “The significance of this difference is that as the world moves towards deeper penetrations of renewable energy on the grid, there will be a commensurate increase in the duration requirement of energy storage assets on the grid. The more renewables you have on the grid, the longer the duration of storage you require on the grid. Batteries, which are good for a few hours, are excellent for our needs today, but will not be able to help us achieve the deep decarbonization goals of the future.”
These statements are backed by scientific studies published by MIT Technology Review and the Long Duration Energy Storage Council. The MIT report found that California would need 20 times its existing energy storage capacity when it achieves its 50% renewables target. More strikingly, it’s predicted that the state would require 4,000 times the existing energy storage capacity by 2045, once renewables account for 100% of the energy system.
In addition, Larsen notes that other studies indicate that once renewable energy penetration crosses the 60% threshold, grids will require tens to hundreds of hours of storage. He reports, “California, one of the most advanced renewable markets globally, is at around 50% and is on course to reach the threshold by 2026. This was part of the impetus for their global solicitation for non-lithium batteries, which we happened to win. They know the big switch to renewables is imminent, and they need technologies to support this transition.”
e-Zinc currently has a team of 25 and is actively recruiting to double its team this year. Top on the team’s agenda is getting the word out that there is a new battery in town, which it is doing with the help of partners like the Zinc Battery Initiative. “ZBI is doing a lot to promote zinc batteries,” says Larsen. “For example, they commissioned a study on the sustainability of zinc, including its recyclability and reusability.”
e-Zinc is deploying its first fully integrated energy storage solution in Canada in partnership with Faromor, a natural ventilation company, and SunGrid Solutions, one of Canada’s leading system integrators. Although the company already has a fully functional deployment at its offices in Toronto, Ontario, Larsen sees this as a significant technical milestone.
“It will be the first time demonstrating our technology as a holistic system, incorporating the power electronics and software and controls, all connected to solar and the grid to deliver power to site,” Larsen explains. “This project will demonstrate how our solution can serve various use-case scenarios, whether resilience and backup power, renewable energy generation integration on-grid, or remote/off-grid power.”
He also points out that the deployment will demonstrate some key differences between lithium battery solutions and e-Zinc’s zinc battery solution. He clarifies, “Two striking differences are battery size and temperature resistance. Owing to density, lithium batteries are typically smaller, making them ideal for applications like mobile phones, laptops, and EVs. Our batteries are much bigger and ideal for stationary storage systems like on a farm or behind a data center. Secondly, zinc batteries can withstand extreme temperatures with some estimates showing ranges of negative 30 to 60 degrees Celsius, although the actual range could be higher once we fully characterize the battery’s performance.”
With so much on the horizon for e-Zinc, any startup would be overwhelmed by the sheer number of possibilities. However, for Larsen and his team, containing all this salient potential in a simple growth plan offers clarity of vision.
“We think of our short and medium-term market strategies as horizons,” he explains. “The first horizon is ‘resilience’, which is a way to offer backup power effectively and economically for applications like data centers, hospitals and others currently relying on diesel generators. The second horizon is ‘remotes’, which targets off-grid applications like mining operations and Indigenous communities, who currently rely on diesel generators as their primary source of power. Although such applications may want to embrace renewables, if the sun does not shine or the wind does not blow for a few days, current batteries would not last. Our technology’s ultra-long duration offers a unique opportunity not just to mitigate the use of diesel, but to eliminate it in these off-grid applications.”
In the long-term, e-Zinc is banking on its vision-mission-oriented culture to pursue an even more ambitious goal. “Our vision is access to affordable, clean, reliable energy for all,” says Larsen. “We see an incredible opportunity to vertically integrate ourselves and become one of the few incumbents that offers one-stop-shop renewable energy solutions to customers as the industry matures.”