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Agora Energy Technologies just won the 2021 Keeling Curve Prize for Capture & Utilization, sharing it with another firm this year. Earlier this year, it won first prize in the Hello Tomorrow global deeptech competition against 5,000 entrants from 128 countries. Agora’s technology is revolutionary, and the awards are well deserved. They picked up the Asian Alibaba Entrepreneur Fund Award in 2020, and the CEO, Christina Gyenge, PhD, is one of three 2021 Fellows in the Cartier Women’s Initiative science and technology global competition as well. As a result, they’ve been talking to global technology firms, and Canadian trade ambassadors for France and Hong Kong among others.

So, what is their award-winning technology, and what’s so great about it? For those interested in the deep electrochemistry, I recommend reading their peer-reviewed paper on their approach, The carbon dioxide redox flow battery: Bifunctional CO2 reduction/formate oxidation electrocatalysis on binary and ternary catalysts published May 31st, 2021 in the Journal of Power Sources (Impact factor: a very respectable 8.87 in 2021), but otherwise, here’s the low down.

Agora’s technology is a redox flow battery. That tech has been around for a while. NASA was working on them in the 1970s. The first one was stood up at the University of New South Wales, Australia in 1984, using the metal vanadium as a core component of its electrolyte. Commercial variants started appearing in the past decade, all using metals as the basis of their electrolytes. Bill Gates has invested in an iron-based one via Breakthrough, and it’s one of the few of his investments in climate solutions I consider to be a decent choice.

Where do redox flow batteries fit? I have an opinion, having gone deep on energy storage over the past few years, including a series on closed-loop, pumped storage hydro and looking at lithium-ion battery futures with a PhD student of Stanford’s Mark Z. Jacobson, as well as talking with Professor Jacobson directly about storage. In my opinion, lithium-ion in its various incarnations will deal with a lot of 4-8 hour demand management and ancillary grid balancing requirements, including some duck-curve issues. Redox flow batteries will compete a bit for same day storage, depending on the technology, and extend out for 1-3 days or even longer up to several weeks. Closed-loop, pumped hydro storage will mostly take over after 2-3 days and extend out to 2-3 week storage. A lot less storage is required than many people assert, but still a great deal of storage is required, and the solutions will overlap. In other words, redox flow batteries will be a big part of a big market.

Lithium-ion batteries are limited to short-term storage because their energy and power attributes scale in lockstep. The more MWh a lithium-ion battery can store, by definition the more MW it supplies. There are some hacks you can do with that, but effectively you get to a point where you don’t need that many MW at a time, so lithium-ion is unwieldy in the system. Great for demand management with the likely 20 TWh of lithium ion batteries in electric vehicles in the US alone by 2050 by my estimation, but that won’t help much for next day or next week storage.

Redox flow batteries dodge this. They use big tanks of chemicals separate from the bits that transform one type of chemical into another, storing the energy, or transforming it back or into something else, releasing the energy. That separates the power and energy attributes of the battery. You can scale up the MWh storage of the battery as much as you want, while maintaining the same MW of electricity capacity. They share that benefit with closed-loop, pumped storage hydro, but without the necessity to put 30-foot diameter tunnels through miles of rock.

Think of it like a car engine and a gas tank. The gas tank is the energy store, and determines how long you can drive for. The engine provides the horsepower, which says how much work you can do. Energy is MWh. Horsepower is MW. Lithium-ion batteries put both in a single package, and to get more energy, you have to add lots of both energy and power, meaning you end up with too much power a lot of the time. But redox flow batteries separate the gas tank and the engine, just like in car. That means you can get as much energy as you need, with only as much power as you need. And because they are stationary, you can make the gas tank as big as you want.

Not All Redox Flow Batteries Are Created Equal

Most of the technologies were patented decades ago. Except for Agora’s, they all use metals, often toxic ones, and usually expensive ones. They have weaknesses in terms of energy density or durability. The metals used for electrolytes and the semi-precious metals used for catalysts make them capital intensive. Many of the technologies have unsolved challenges. They are batteries, and that’s all they are. Many are good, but aren’t amazing. And they are comparatively expensive.

Then there’s Agora’s solution. First, the team.

The co-founders are Christina Gyenge and Elod Gyenge, both PhDs. Christina is CEO and in addition to her chemical engineering PhD has done post-doctoral work at Stanford and multi-disciplinary work across biology and biological systems chemical and energy engineering. Elod is the President of the company and CSO as well as a professor of chemical engineering at UBC. He is a leader in electrochemical engineering research and has been recognized with numerous international awards and honors. Elod has extensive industrial experience and has collaborated with Ballard and Fortune 500 companies on chemical engineering around fuel cells and related technologies. The Director of R&D at Agora is Dr. Pooya Hosseini-Benhangi. Pooya obtained his PhD at UBC in Elod’s group and has also spent time applying electrochemistry to gold mineral processing as a post-doctoral fellow. The core redox flow battery innovations are protected by patents in various stages of finalization in 52 countries, with the Israeli patent just awarded. Several electrochemical and chemical engineers round out the mix.

Christina and Elod started working in this space in 2012. They have three primary innovations that are unique as far as I am aware. 

The first is that they are using gaseous CO2 in the charging phase in a hybrid gas-liquid redox flow battery. Reversing it in the closed-loop model produces CO2 again, unpacking the energy. A major advantage of this is that CO2 and the other chemicals are cheap, non-toxic and common, unlike the metal-based electrolytes of vanadium and other metal-based redox batteries. As with many fields, paradigms are hard to dig out of, and batteries being metal-based is one of those tough paradigms. The closed-loop battery model doesn’t consume the CO2, but CO2 is very cheap by the ton, $30-$100, making the economics of this approach better than metal-based batteries, where the metals often cost thousands or tens of thousands of dollars per ton. Their work on CO2 gas diffusion exchange is cutting edge, well ahead of most others, and a massive technical differentiator as well as a strong value add.

The second deep insight is their catalyst. It’s a core part of their intellectual capital that they are protecting for a simple reason. The catalyst is a cheap and common substance, overcoming a different challenge for many other flow batteries and fuel cells, which typically use semi-precious metals such as platinum, which typically range from $30 – $60 per gram. While little of the precious metals is used per cell, when you start multiplying by thousands of cells, it starts to add up quickly.

But the biggest one in my opinion is the open-loop model. A closed-loop model transforms the CO2 from one chemistry to another, and then back. In the open-loop model when the energy is extracted, the CO2-based chemicals are transformed to carbonates or bicarbonates.

Why is that important? Well, there are a few reasons. The first is that carbonates and bicarbonates are big business. My assessment sees a $44 billion annual market for the chemicals that Agora’s tech can produce from waste CO2 and clean electricity. The second is that this displaces the Solvay process. I’ve looked at that industrial process, just as I’ve looked at cement production, and Agora’s approach is so much cleaner it’s painful. The Solvay process produces a net 2.74 tons of CO2 per tons of bicarbonates produced in the 1870s chemical process involving ammonia, heating with natural gas, and cooling in different steps. Every box of baking soda you’ve ever bought comes with an invisible 3 boxes of CO2 by mass, in other words. More on this in the next article.

In Agora’s process, lower-cost renewably generated electricity flows in at night or other times of day when it happens to be cheap, the process runs at room temperature, and no ammonia is involved. You could put Agora’s tech in a light-industrial building downtown and no one would notice. The third is that it consumes waste CO2, instead of producing a lot of CO2 as the Solvay process does. This is one of the few carbon usage models that makes fiscal and technical sense, and fits as an industrial component of the future. I know, I’ve spent a lot of time assessing carbon capture and industrial processes’ CO2 footprints.

Lazard unsubsidized levelized cost of storage with Agora's technology annotated

Lazard unsubsidized levelized cost of storage with Agora’s technology annotated

But it’s the combination that’s key. It’s a battery. Shove renewable electricity into it, and get clean electricity back. Lots of tech does that. However, Agora’s tech has excellent energy density, and great durability too. It can store a lot of electricity for the mass and cycle it a lot of times. Using CO2 instead of metals makes it a lot cheaper. And their catalyst being cheap due to the chemistry makes it even cheaper. 

Relative ROI for different battery technologies

Relative ROI for different battery technologies by author

Those basic factors make it cheaper than most other forms of storage automatically. Cheaper to build. Cheaper to operate. Lower cost storage. Agora has done four fiscal case studies with LafargeHolcim for the technology applied to wind energy grid balancing and an integrated low-carbon cement plant of the future, so the numbers have been scrubbed backward and forward. 

And the kicker is the carbonate and bicarbonate production. It consumes waste CO2. It produces useful chemicals. Bicarbonates are in lots of things. Food. Toothpaste. Antacids. And they are worth from $200 – $600 per ton, depending on the chemistry and the purity. Imagine a battery that lasts a long time, eats CO2, and produces useful industrial chemicals. It’s a trifecta. 

Chart of relative carbon neutrality of different battery technologies chart

Chart of relative carbon neutrality of different battery technologies chart by author

These battery technology comparison charts are early and indicative, not late, based on rock solid numbers, or seriously reviewed. I pulled them together based on discussions, but they haven’t been validated. My gut tells me that they are close to right in terms of scale, but there’s more work to do on them. And more variants of these assessments to produce. No wonder Hello Tomorrow, the Keeling Curve Prize Team and the Cartier’s Womens Initiative picked Agora. I saw this 20 months ago. The Agora team saw this close to a decade ago.

Their solution isn’t a thornless bed of roses, of course. 

The CO2 is transformed into an acid on the way through the process into the storage medium, so that requires care in handling. The set of chemicals include bromine variants. While bromine is an essential trace element in human biology, as with dihydrogen monoxide too much is lethal. The toxicity of the bromine is a concern that must be managed. Other alternatives are less efficient.

Technology readiness levels

Technology readiness levels courtesy NASA

They are at lab efficiency levels right now. While projections indicate that they will get over 80% in terms of round-trip storage, this hasn’t been demonstrated. They are at the MVP stage or technology level four, and need to build a scaled prototype. That’s going to take 2-3 years, and another few million dollars.

They aren’t a manufacturing and distribution firm or a chemical commodity firm, but a technical innovation firm. They need a global manufacturing partner and a chemical commodity partner. Firms like that have been knocking on their door a lot in the past couple of years, and a lot more with the various prizes this year.

Agora’s CO2-based redox flow batteries will be a core technology assisting us to bend the Keeling Curve back down. Hello Tomorrow indeed.

Full disclosure. I have a professional relationship with Agora as a strategic advisor and Board observer. I did an initial strategy session with Agora about their redox flow battery technology in late 2019 and was blown away by what they had in hand, and my formal role with the firm started at the beginning of 2021. I commit to being as objective and honest as always, but be aware of my affiliation.

 

 
 

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Podcast: Tesla Robotaxi setback, Mercedes-Benz CLA EV, Bollinger is over, and more

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November 28, 2025

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Podcast: Tesla Robotaxi setback, Mercedes-Benz CLA EV, Bollinger is over, and more

electrek podcast

In the Electrek Podcast, we discuss the most popular news in the world of sustainable transport and energy. In this week’s episode, we discuss a big Tesla Robotaxi setback, the new Mercedes-Benz CLA EV, Bollinger is over, and more.

Today’s episode is brought to you by Climate XChange, a nonpartisan nonprofit working to help states pass effective, equitable climate policies. Sales end on Dec. 8th for its 10th annual EV raffle, where participants have multiple opportunities to win their dream model. Visit CarbonRaffle.org/Electrek to learn more.

The show is live every Friday at 4 p.m. ET on Electrek’s YouTube channel.

As a reminder, we’ll have an accompanying post, like this one, on the site with an embedded link to the live stream. Head to the YouTube channel to get your questions and comments in.

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After the show ends at around 5 p.m. ET, the video will be archived on YouTube and the audio on all your favorite podcast apps:

We now have a Patreon if you want to help us avoid more ads and invest more in our content. We have some awesome gifts for our Patreons and more coming.

Here are a few of the articles that we will discuss during the podcast:

Here’s the live stream for today’s episode starting at 4:00 p.m. ET (or the video after 5 p.m. ET:


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Segway’s latest E3 Pro smart e-scooter hits new $500 low, NIU Black Friday EV sale (47% off), Anker SOLIX, Lectric, Aiper, more

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15 hours ago

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November 28, 2025

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Segway's latest E3 Pro smart e-scooter hits new 0 low, NIU Black Friday EV sale (47% off), Anker SOLIX, Lectric, Aiper, more


Today’s Green Deals is another jam-packed Black Friday edition, with all the ongoing savings we’ve spotted up until today having been collected into our Black Friday Green Deals hub here for your one-stop shopping needs. Our headliner is Segway’s new feature-packed E3 Pro Electric Scooter with Apple Find My that is down at a new $500 low, with NIU’s full Black Friday EV sale following right behind with up to 47% taken off e-scooters and e-bikes starting from $279. There’s also Anker’s SOLIX C300X AC Portable Power Station and a bundle option at new low prices starting from $160, as well as Lectric’s newly launched 40% off e-bike accessory sale + increased 30% off e-bike extra batteries, a smart irrigation system, a battery jumper/power bank combo, and much more waiting for you below. And don’t forget about the hangover deals that are collected together at the bottom of the page (and also in our Black Friday Green Deals hub), like yesterday’s expanded Rad Power Black Friday Sale lineup, the Black Friday savings on Anker eufy smart security devices at new lows, and more.

Head below for other New Green Deals we’ve found today and, of course, Electrek’s best EV buying and leasing deals. Also, check out the new Electrek Tesla Shop for the best deals on Tesla accessories.

Segway’s feature-packed E3 Pro electric scooter with Apple Find My hits new $500 Black Friday low (Save $200)

Segway’s Black Friday Sale is in full gear and currently seeing hundreds in savings and plenty of returning and new low prices on its e-scooters and e-bikes. One such standout is Segway’s latest E3 Pro Electric Scooter down at $499.99 shipped, and which seems to have disappeared from Amazon’s marketplace. Carrying a $700 MSRP since launching back at the top of October, we’ve only seen this model given $100 price cuts in its launch deal and the brand’s Halloween and early Black Friday sales. Now, with things having ramped up with increased savings now that Black Friday is in full swing, you can score a larger-than-ever $200 markdown to a new all-time low price, giving you an advanced upgrade to your commute that I have been loving so far since getting one a short time ago.

I’ve been riding around Brooklyn for a short time now with my own Segway E3 Pro Electric Scooter and have been loving my experience so far, as it’s a MAJOR step up from the very basic E22 model I’ve had for short travels since 2020. While power has been significantly ramped up from its E2 Pro predecessor, this new generation still retains a fairly lightweight 40-pound design, which I am able (as a not-so-strong person) to carry easily with one hand/arm up and down my second-story stoop.

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Segway’s E3 Pro comes bearing a 400W motor (with 800W peaking) alongside a 368Wh battery, the combination of which delivers up to 34 miles of commuting support for your travels at up to 20 MPH speeds. The regenerative brake paired with the brand’s SegRange Optimization tech really lends towards the extended travel times here, with safety taken into mind with the SegRide stability enhancement tech, the latest traction control system, turn signaling, RGB ambient lighting for nighttime journeys, and a bright headlight. What’s more, security is bolstered by the Apple Find My inclusion for those worried about tracking it down should theft (or forgetfulness) occur.

One thing I have really been enjoying, especially when riding over more pot-hole lined streets, is Segway’s E3 Pro’s dual elastomer suspension, which does a great job of smoothing out overall rides, while providing added cushioning when sudden, jolting sections of the road (or debris/trash) are driven over. Along with all those, there are also additional features, including the previously mentioned rear electronic regen brake getting a companion front drum brake, as well as 10-inch self-sealing jelly tires, an IPX5 water-resistant build, a 265-pound total payload, and a 3-inch full-color LED screen for setting adjustments.

Be sure to check out Segway’s full official Black Friday Sale while it lasts for a short while longer, which can save you hundreds at the best prices of the year starting from $150.

man and woman riding NIU KQi 200F electric scooters through streets in both day and night

Score up to 47% Black Friday savings on NIU EVs, like the 2025 KQi 200F e-scooter at its $529 low (Reg. $799), more from $279

NIU’s Black Friday EV Sale is in full motion now, taking up to 47% off its lineup of e-scooters and e-bikes, like the KQi 200F Foldable Handlebar Electric Scooter for $529 shipped, which you can currently only find in a used condition at Amazon. This is one of the brand’s newer 2025 models that fetches $799 at full price, which dipped down to this rate for the first time earlier in the month before these Black Friday savings. Now, you’re getting another shot at this all-time low price with $270 savings, giving you a solid commuter that sits among the mid-range models from NIU.

You can view the full lineup of NIU’s Black Friday e-scooter and e-bike deals in our original coverage here.

Anker SOLIX C300X power station charging drone and projector on rocks

Anker’s SOLIX C300X 90,000mAh portable power station + solar bundle option at new Black Friday lows from $160

As part of Amazon’s ongoing Black Friday Week Sale, and running parallel to Anker’s SOLIX Black Friday Sale, the brand’s official storefront is offering the C300X 90,000mAh Portable Power Station (misnamed on page as C200X) for $159.99 shipped. Normally going for $300 at full price, this alternate darker colorway beats out its standard grey colorway’s direct sale pricing by $40, with its Amazon pricing on that model also beaten out by the same amount. Discounts before October kept things above $189, with increased falls lower to 169 and $161 over last month and mid-way through this month, before this Black Friday deal dropped things to a new all-time low. Not only are you saving a total $140 here, but you’ll also be getting the best price tracked on the station’s 60W foldable solar panel bundle that’s down at a low of $240 shipped.

If you want to learn more about this model, be sure to check out our original coverage of these deals here, and be sure to also browse through Anker’s extended/expanded SOLIX Black Friday Sale in full here.

man and woman riding Lectric e-bikes
man holding Lectric e-bike battery
Aiper IrriSense smart irrigation system watering grass in yard
GOOLOO's GP4000 jump started connected to car battery

Best Fall EV deals!

Best new Green Deals landing this week

The savings this week are also continuing to a collection of other markdowns. To the same tune as the offers above, these all help you take a more energy-conscious approach to your routine. Winter means you can lock in even better off-season price cuts on electric tools for the lawn while saving on EVs and tons of other gear.


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Tesla has sold ~100 cars since entering the world’s largest country in July

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November 28, 2025

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Tesla has sold ~100 cars since entering the world's largest country in July

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Tesla’s much-awaited entry into the Indian market has resulted in very slow sales to start, but it may not all be bad.

We’ve covered the years-long effort of Tesla to enter the Indian auto market. There have been a lot of intentions and fits and starts, but due to protectionist schemes in the country it never made a lot of sense for Tesla to enter.

That changed this year in March, when India waived EV import duties, allowing foreign firms to bring their cars in for sale. While India does have some strong local brands in Mahindra and Tata, this opened the gates to Chinese, German, Korean and American brands – namely, Tesla.

So far, other American companies have declined to bring their EVs to India, but Tesla opened its first showroom in Mumbai, India’s most populous city and financial capital, in July of this year. It opened a larger “Tesla Center” showroom in Gurugram, outside Delhi, this week.

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So, Tesla is only getting started in India, but by all measures it has been an exceedingly slow start, according to the BBC.

Dealership data shows that Tesla has only sold “just over” 100 cars in India since July, an exceedingly low number by any measure – especially when considering the India is now the most populous country in the world, with a population of just under 1.5 billion.

Tesla’s rocky start included losing its head of Indian operations just before launching its first store, among a slew of other executive departures this year and last.

The numbers look a little less bad when comparing against EV sales in the country. While India has sold an impressive 2 million electric vehicles this year, the vast majority of them have been electric scooters.

Electric passenger cars are a much lower share at around 160k total unit sales this year so far, making up only around 3% of the passenger car market. And the majority of those are lower-cost domestic brands Mahindra and Tata or a growing section of Chinese challengers, with very few sales from overseas luxury brands.

Tesla could be included in that “luxury brand” list, largely due to the price of its imported vehicles. While the Model Y starts at $40k in the US, that price rises to 5,989,000 Rupees in India (~$67k USD). This is simply an unaffordable price for the vast majority of Indians – indeed, only around 1% of India’s auto sales are in the “luxury” category.

Further, EV infrastructure is not very well developed in the country. Tesla has one Supercharger in India, and two listed as “coming soon” in the Gurugram area. There are thousands of other charging points across India (and of course, drivers can charge overnight at home), but the number is still relatively low compared to the country’s population.

Meanwhile, other brands’ EV sales are growing well in India. The auto market as a whole has grown by about 13% this year in the developing country, but EV car sales have grown by 57% in the same period, rapidly outpacing the auto industry as a whole.

Much of that sales growth has been driven by Chinese EVs, which make up around a third of the market. That’s around ~60k Chinese EVs sold this year in India.

Even luxury German EVs from Mercedes, BMW and Audi have sold around 4,000 units so far this year, not a large number, but certainly dwarfing Tesla’s.

So while it’s tempting to look at Tesla’s poor numbers and make excuses about the size of the EV market, ability of Indians to afford luxury vehicles, or state of India’s charging network, it’s hard to compare that low ~100 sales number at any of the competition and label it as anything other than an extremely poor showing.

But, you do have to start somewhere, and the company is only a few months in. So we’ll have to see where it goes from here – though with the sales we’ve seen so far in Mumbai, entering the Delhi market is unlikely to forestall Tesla’s current global sales decline.

The 30% federal solar tax credit is ending this year. If you’ve ever considered going solar, now’s the time to act. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. It has hundreds of pre-vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.

Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisors to help you every step of the way. Get started here.


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