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An ESS Inc battery.
Photo courtesy ESS Inc

ESS is trying to solve a critical problem with renewable energy: How to store energy from wind and solar installations when the wind isn’t blowing and the sun isn’t shining.

The company’s proposed solution is a long-duration energy storage batteries made of iron, salt and water, which are much cheaper and more readily available than the elements used in batteries today, like lithium and cobalt. Its early momentum attracted $57 million in investments from powerful backers like Bill Gates and Softbank, CEO Eric Dresselhuys told CNBC.

On Monday, it hits another milestone, going public via SPAC to begin trading on the New York Stock Exchange on Monday under the ticker symbol GWH. It hopes to raise $308 million through the deal.

“There have been very few solutions for this long duration up until now, and it’s largely driven from the fact that we didn’t rely on energy storage as a major solution for hardening the system,” said Dresselhuys, who became the CEO of ESS this year after decades of energy and technology executive experience.

The company launched in the garage of co-founders Craig Evans and Julia Song in Portland, Ore., in 2011 (they’re a married couple, in addition to being business partners), then moved to the Portland State Business Accelerator before expanding to its current 200,000-square-foot headquarters.

The company is backed by Bill Gates’ clean energy investment firm Breakthrough Energy Ventures, SB Energy (a wholly owned subsidiary of SoftBank) and multinational chemical company BASF, among other investors. The SPAC comes through a reverse merger with ACON S2 Acquisition Corp., run out of private equity firm Acon Investments.

ESS has not recorded any revenue yet, according to financial filings dated Sept. 8, but Dresselhuys says it has shipped product to customers, including TerraSol Energies in Pennsylvania and Siemens-Gamesa in Denmark; investor documents claim several other unnamed utilities as customers also. Also, ESS has orders in the pipeline from SB Energy and Enel Green Power España.

The company lost $245.3 million in the first six months of 2021, but only $18.4 million were operating losses (the remainder was due to losses on reevaluations of warrant and derivative liabilities). Operating losses were $17.4 million for 2021, and it expects to record its first profit in 2023.

Iron, salt and water: Safe, readily available materials

The big breakthrough for ESS is a long-duration battery built from readily available materials, explained Carmichael Roberts, a co-chair of the investment committee at Breakthrough Energy Ventures In a battery, the electrolyte is the liquid medium that connects the two ends of a battery, the anode and the cathode.

“The flow battery is cheaper, safer and has better operational life than conventional lithium-ion storage,” Roberts said.

Making a battery out of iron, salt and water means “there’s no toxicity, the technology we build doesn’t start fires or doesn’t blow up in fire,” said Dresselhuys.

Also, ESS batteries do not have lithium or cobalt, two common elements in batteries that are being impacted by supply chain crunches.

“Both are in potentially short supply globally and none are produced in the U.S.,” said Jesse Jenkins, an assistant professor at Princeton University who specializes in the energy grid.

“Lithium is less of an issue in the long run, as long as we recycle lithium ion batteries, but there may be some short-run price increases as production ramps up to match battery demand for EVs,” Jenkins said.

“Cobalt is a bit trickier and has come under fire for some of the supply chain relying on quote unquote ‘artisanal mines’ in Africa, which employ forced labor, and child labor in some cases, with people digging out cobalt by hand and very, very harsh conditions,” Jenkins said.

Neither does ESS use vanadium, a chemical element used in some flow battery technology. While promising, Dresselhuys says it’s too expensive to be meaningful.

“It’s one thing to make something work, and that can be very difficult. But it has to work cost effectively to be viable as a system because of the scale we’re talking about,” he said.

How the battery works: ‘The elegance is the simplicity’

Visualize a sandwich, said ESS’s business development lead, Hugh McDermott. The ESS battery technology is a stack of carbon plates with salt water with iron flowing through each layer.

Iron comes out of the salt water solution and sticks to one side of the plates. When the polarity of the plates is changed, the iron dissolves back into the water solution.

From a battery management control system, the flow of the ions can be switched, thereby also switching the flow of electricity onto and off the grid.

ESS Inc’s iron flow battery “stack.”
Image courtesy ESS Inc.

The idea of a iron flow battery has been around since the 1970s, Dresselhuys said. But there were technical issues that scientists hadn’t solved.

For example, early iterations of the iron flow battery technology would work for a while, but the electrolyte fluid would become imbalanced, build up on the battery, and the battery would become ineffective over time. To fix this, ESS developed a proton pump, which Dresselhuys says “allows the system to keep itself in balance throughout all of those charges and discharges so that the electrolyte is entirely clean.”

Early research was funded in part by almost $3 million dollars in grant funding from the Department of Energy’s ARPA-E program, as well as individuals and local investment funds.

“The elegance is the simplicity,” said Rich Hossfeld, co-CEO at SB Energy and a board member at ESS. (SB Energy is not only an investor, but also a customer.)

But it took a lot of research and development to get a simple solution to work. ESS has been working on research and development for a decade. The proton pump was a really key breakthrough for the company, but one of many.

“There’s a very large intellectual property moat around the core technology and that will make it very difficult for other competitors to build a battery that is similar to ESS’ battery,” Hossfeld told CNBC.

An ESS Inc battery
Photo courtesy ESS Inc

Another long duration battery being developed by Form Energy also uses iron and also is backed by Breakthrough Energy Ventures. Form, however, is developing iron-air batteries, which uses different technology and aims to provide energy storage for multiple days.

ESS batteries can store energy for 4 to 12 hours, whereas the lithium batteries in cars are typically capped between two and four hours, Dresselhuys said.

To go above four hours of energy storage with lithium-ion batteries requires increasing the number of lithium-ion cells, Hossfeld told CNBC. ESS, on the other hand, can just add more water, iron and salt to a bigger tank of its stack-sandwiches.

“The way to think about ESS cost-wise is they are cost parity with lithium ion at four hours, and about half the cost above that, which we think creates a big advantage for them,” Hossfeld told CNBC.

Another key to the ESS iron-flow technology is its resilience.

“Capacity stays the same between year one and year 20,” Hossfeld said. Anyone who has a cellphone knows that is not the case for lithium-ion batteries. “You open it up, it comes out of the case, right now it will give you 10 hours. We all know it doesn’t give you 10 hours in a year, right?”

Energy centers are co-located with a wind or solar farm, allowing the batteries to charge up during the day when the sun is shining and then discharge in the late afternoon when there is typically a bump in energy demand.

SB Energy’s first installation of ESS Inc batteries in Davis, Calif. SB Energy is an investor in ESS and also a customer. These are batteries SB Energy purchased.
Photo courtesy SB Energy

Similarly with wind. “You can store four, eight, 10 hours of wind plants in the middle of the night and then discharge it during the day as needed,” Hossfeld told CNBC. “We look at ESS as a really good complement to that daily cycling between wind and solar.”

The Energy Warehouse, the only ESS product that exists so far, is the size of a shipping container, 40 feet long and 8 feet wide.

“That container holds 500 kilowatt hours of energy. That’s roughly the energy that you would need to power 20 to 30 homes, depending on where you are in the country,” McDermott told CNBC.

Four ESS Inc batteries
photo courtesy ESS Inc

ESS is also building a product called Energy Centers intended for utilities and independent power producers — for instance, businesses that own large solar farms who then sell that power to the grid.

For these kinds of larger customers, ESS will use similar battery technology, but the battery modules will be contained together in a building. Customer trials are expected to begin in 2022.

The big challenge: Getting an iron flow battery to scale

While iron-based batteries are a well-known technology, the big challenge has been getting them to scale.

“Iron based chemistries for flow batteries have a long and storied history, rightfully so because in theory they have some of the lowest theoretical costs possible. On paper these systems scale quite well,” explained Dan Steingart, Associate Professor of Chemical Metallurgy at Columbia University

But the reality has been quite different.

“We have not seen widespread adoption of this class of batteries and its cousins because of last-mile engineering challenges that have in the past added unacceptable capital and operating costs when compared to other available technologies,” Steingart told CNBC.

Flow batteries depend on pumps and membranes that are highly technical. “Think a kidney, writ very large, working 10,000 times harder than it has to, all the time,” he said. “It has been very difficult to have these, in practice, operate in a reliable manner without significant ancillary systems (that make the system more expensive upfront) or maintenance calls (which increase running costs).”‘

That said, Steingart notes the “sufficient capital” ESS has raised to validate its solutions to these challenges.

Also, ESS in September secured a 10-year battery warranty backed by the insurance giant Munich Re, which “is a strong signal of a positive outcome,” Steingart told CNBC.

Cost is another conern.

“The iron flow battery technology looks very promising as it is safe, environmentally friendly, uses non-toxic materials that can be sourced in the US, and doesn’t degrade over time and over multiple cycles,” Jan Pepper, the CEO of Peninsula Clean Energy, told CNBC.

Peninsula Clean Energy, a community energy buyer and the official power provider for San Mateo County in Calif., has not worked with ESS directly, but it’s trying to deliver cost-competitive 100% renewable energy on a 24/7 basis by 2025. Pepper knows that energy storage will help meet those goals.

“The current challenge with iron flow batteries is the cost,” Pepper said. “If companies like ESS can bring the cost down for their technology, then they and others will be able to make a meaningful impact in decarbonization efforts and help organizations like Peninsula Clean Energy meet our ambitious goals.” 

As Steingart told CNBC, “A goal I use is in my lab for long duration energy storage: The battery has to cost about the same price as dog food per pound and last forever with little intervention.”

That said, if ESS can do what its investors think it can, “the successful execution of this chemistry would be a significant milestone for grid scale energy storage,” Steingart told CNBC.

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Heybike Hauler cargo e-bike hits $999 low ($500 off), EcoFlow DELTA Pro with transfer switch at $1,709 low + other units, Worx, more

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July 7, 2025

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Heybike Hauler cargo e-bike hits 9 low (0 off), EcoFlow DELTA Pro with transfer switch at ,709 low + other units, Worx, more

It’s the calm before the storm as everyone prepares for Amazon’s Prime Day Sale event starting tomorrow morning (July 8), but that doesn’t mean there aren’t still solid Green Deals coming in today. Leading the pack is Heybike’s Hauler Cargo e-bike that is back down at its $999 low for the second time. Right behind it is EcoFlow’s final early Prime Day flash sale on three units, with the DELTA Pro Portable Power Station bundle coming back around at a $1,709 low that also gives you a free transfer switch and RAPID 5,000mAh power bank, as well as savings on DELTA 3 and WAVE 3 bundles from $529. We also have Worx’s Nitro 20V 8-inch Cordless Pole Chainsaw at its best 2025 rate of $119, as well as EGO’s 56V 21-inch Cordless Electric Lawn Mower with a 5.0Ah battery and rapid charger at $365. Plus, there’s all the hangover Green Deals still seeing savings in our one-stop-shop July 4th hub in the links at the bottom of the page – with many of the savings ending tonight!

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.

Affordably carry cargo with Heybike’s single or dual-battery Hauler e-bike starting from a $999 low

As part of its Prime Day e-bike Sale, Heybike is offering its Hauler Cargo Single-Battery e-bike at $999 shipped, while the dual-battery counterpart is down at $1,399 shipped. You’d normally shell out $1,499 and $1,899 for these two setups at full price, though discounts regularly bring things down to $1,199 and $1,599, which we have seen go lower a few select times in 2025. Only once before have we seen these two low prices appear, back during the brand’s Memorial Day Sale, with you getting another chance at the $500 savings here today.

Heybike’s Hauler e-bike comes as an affordable means to transport precious cargo, with the 750W brushless geared hub motor peaking at up to 1,400W to tackle inclines and for better pick-up when you’ve got packages, groceries, and more on board. It can max out at 28 MPH speeds in states where it’s allowed, and comes with the two battery options that largely depend on how much travel time you need, with the solo-battery setup giving you up to 55 miles of pedal assisted support and the dual-battery setup increasing that travel range up to 85 miles.

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The Heybike Hauler e-bike boasts a 440-pound payload, as well as foldable running boards for when you want to bring a passenger along, not to mention the obvious integrated rear cargo rack that doubles as the seat. For the price right now, you’re also getting a solid lineup of features, including hydraulic front suspension, hydraulic disc brakes, puncture-protected tires, a Shimano 7-speed derailleur, an auto-on LED headlight, a brake-lighting integrated taillight, and an LCD screen for data and setting adjustments.

You can check out Heybike’s full lineup of Prime Day e-bike deals on the landing page here.

EcoFlow DELTA Pro portable power station

Get sectional backup support with EcoFlow’s DELTA Pro and transfer switch + free power bank at $1,709 low

It’s the final day of EcoFlow’s early Prime Day Sale, and the brand’s final flash sale is in full swing through the rest of the day. The flash savings here are taking up to 54% off three units – two power station bundles and a bundle for the brand’s newest AC/heater solution. Leading the sale is the DELTA Pro Portable Power Station that comes with a free transfer switch for $1,709.05 shipped, after using the code EFPDAFF5 at checkout for an additional 5% savings – plus, you’ll also be getting a free RAPID 5,000mAh power bank thrown in too. We’ve been seeing many different flash sales focusing on the DELTA Pro at this same rate during this sale, which usually carries a $3,699 MSRP, though it is regularly sitting around $1,999 from Amazon (currently $1,784 there). Not only are you getting another chance at the biggest savings and the best price here, but you’re doing so while also getting the means for sectional home backup support.

One of the best and most expansive of EcoFlow’s legacy models, the DELTA Pro power station is ready to cover your campsites, outdoor gatherings, and home backup emergencies with a 3,600Wh LiFePO4 capacity that you can expand as high as 25kWh with future investments. There are 14 port options here, through which the station provides up to a steady 3,600W output that can surge up to 7,200W to cover larger appliances. It comes with three primary means to recharge: plugged into a standard outlet, through your car’s auxiliary port, or by connecting up to a maximum 1,600W solar input. The included transfer switch gives you sectional backup support of up to six circuits in your home or on an RV, with it pre-wired for easier installation.

You can also pick up the brand’s DELTA 3 Portable Power Station with a free protective bag at $529 shipped, down from its usual $778 pricing. This is a smaller and more affordable backup option that has a 1,024Wh LiFePo4 capacity and can be expanded up to 5,120Wh with various expansion batteries from across the DELTA ecosystem. It provides 1,800W output, surging to 2,200W when needed, and has 13 total output ports to use for connections to devices and appliances. It also boasts an expanded list of recharging options, including through an AC outlet, with a max 500W solar input, through car charging, generator charging, or there’s the multi-charging option of AC and solar together.

The last of these offers gives you the latest WAVE 3 Portable AC and Heater with an add-on battery and a free bag at $899 shipped, coming down from $1,299. With the battery included here, you can get up to 8 hours of wireless cooling/heating in your tent, car, or anywhere else you’re settling down. The 1,800W output here can “drop temperatures by 15 degrees in 15 minutes,” while the 2,000W heating output hits similar speeds, “raising the temperature by 17 degrees in 15 minutes” – with it able to cover 120 to 180 square feet spaces. There’s even some cool smart control expansions here, including the PetCare mode that automatically starts cooling once temperatures reach 77 degrees, among others.

Be sure to check out EcoFlow’s full early Prime Day Sale lineup here before it ends later tonight.

Worx Nitro 20V 8-inch Cordless Pole Chainsaw

Get 13.3 feet of reach with Worx’s telescoping Nitro 20V 8-inch cordless pole chainsaw at $119 annual low

Amazon is offering the best pricing of the last year on the Worx Nitro 20V 8-inch Cordless Pole Chainsaw at $119 shipped. Normally, you’d have to shell out $170 for this tool at full price, which we’ve seen discounts taking as low as $120 once over the last 12 months, with prices otherwise keeping above $129. While it has gone lower in past years, you’re looking at the best price we have tracked since summer 2024, giving you $51 in savings off its going rate.

You’ll have plenty of reach to trim high branches with this Worx Nitro pole chainsaw, especially with the telescoping pole allowing for tool-free extensions up to 13.3 feet – plus, it weighs in at just 8 pounds, making it easy to manage and operate, despite varying operator sizes. The 8-inch bar and chain has three different cutting angles (0 degrees, 15 degrees, and 30 degrees) it can be set to, with the automatic oiler keeping things lubricated and running smoothly as you work. What’s more, your comfort has been taken into account with the 180-degree rotating rear handle, allowing you to easily switch between vertical and horizontal cutting positions.

EGO Power+ 56V 21-inch cordless electric lawn mower

Bring home EGO’s 56V 21-inch cordless electric mower with a 5.0Ah battery and rapid charger at $365

Amazon is offering the EGO Power+ 56V 21-inch Cordless Electric Lawn Mower with 5.0Ah battery and rapid charger at $364.60 shipped. This package would normally go for $430 at full price, which we’ve mostly seen it keeping at over the last 12 months, with few large price cuts on the books in that timeframe. While we have seen it go as low as $309 in the past, over the last 12 months, the rate we’re seeing today has only been beaten out by a short-lived drop to $350 back in April, with it otherwise being the best price we’ve spotted this year thanks to the $65 markdown.

You’ll get a much more budget-friendly means to tackle lawn care with this 56V 21-inch model over EGO’s higher-end mowers, giving you the torque of a gas engine without the noise and fumes. With the included 5.0Ah battery, the brushless motor will get up to 45 continuous minutes of runtime, while the rapid charger can have it back to full at much faster rates than a standard charger. There are six cutting height levels to adjust between (from 1.5 to 4 inches), as well as the versatility to side discharge, mulch, or collect clippings into the two-bushel bag. Not only does it come with an IPX4 weather-resistance construction, but it starts up at the push of a button and folds to a more compact size for easier storage options.

Best Summer 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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Arizona brings a huge grid battery online ahead of peak demand

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48 mins ago

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July 7, 2025

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Arizona brings a huge grid battery online ahead of peak demand

Arizona grid battery
Photo: e-storage

One of Arizona’s biggest grid battery storage projects is now online and helping power homes as the summer heat ramps up.

Recurrent Energy, a subsidiary of Canadian Solar, just brought its 1,200 MWh Papago Storage facility in Maricopa County into commercial operation. The big grid battery is now supplying stored electricity to Arizona Public Service (APS), the state’s largest utility, in time for peak air-conditioning season.

Papago is the first of three Recurrent projects with APS. Together, they’ll provide 1,800 MWh of storage and 150 MW of solar power. That’s enough to run about 72,000 homes for four hours and provide year-round solar for another 24,000 homes.

“Summer is here, and we’re ready to serve APS customers with the energy they need when they need it,” said APS director of resource acquisition Derek Seaman.

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The Arizona Corporation Commission chair, Kevin Thompson, noted that bringing online one of Arizona’s largest battery storage projects during a critical time when energy demand is skyrocketing is a milestone.

Canadian Solar’s e-STORAGE arm built the project and will keep it running under a long-term agreement.

Recurrent CEO Ismael Guerrero said, “We’re proud to deliver flexible capacity that meets the state’s growing energy needs and grateful for APS’s continued partnership.”

If you live in an area that has frequent natural disaster events, and are interested in making your home more resilient to power outages, consider going solar and adding a battery storage system. 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. They have 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 Advisers to help you every step of the way. Get started here. –trusted affiliate link*

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The Porsche Cayenne EV flexes its power towing 3-tons in public

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51 mins ago

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July 7, 2025

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The Porsche Cayenne EV flexes its power towing 3-tons in public

Porsche-Cayenne-EV-public

Porsche promises the new electric SUV will “set new standards,” and it’s already proving it. Ahead of its upcoming launch, the Porsche Cayenne EV proved its might by towing a 100-year-old classic car and trailer weighing around 3 tons in public.

Porsche Cayenne EV flexes its performance in public

The Porsche Cayenne EV is already smashing records, and it’s not even out yet. Last month, a prototype beat every gas-powered SUV, setting a new SUV record at the Shelsley Walsh hill climb by more than four seconds.

Now, it’s at it again. Porsche showcased a near-production-ready Cayenne EV prototype in England for the first time as part of a public film shoot.

The camouflaged Cayenne EV showcased its impressive power by towing a 100-year-old classic car weighing over 2 tons. Including the trailer, the total weight was around 3 tons.

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British TV presenter Richard Hammond took the Cayenne EV from his workshop in Hereford to his garage, towing the classic car behind.

According to Hammond, the electric SUV “handled it effortlessly,” adding, “We were trailing significant weight behind us, but you wouldn’t know it.”

Porsche-Cayenne-EV-public
Porsche Cayenne EV towing a 3-ton trailer and classic car (Source: Porsche)

Porsche designed the Cayenne EV and its high-voltage system, “to be one of the first BEVs in the world to achieve a towing capacity of up to 3.5 tonnes.” Depending on the configuration, it will be just as capable, if not more, than the current combustion-engine Cayenne.

As Michael Schätzle, Vice President of the Product Line Cayenne, explained, “That’s why we didn’t want to make any compromises in the development of the all-electric model.”

Porsche-Cayenne-EV-public
Porsche Cayenne EV prototype at Shelsley Walsh 2025 (Source: Porsche)

The Porsche Cayenne EV was initially set to launch this year, but it’s now expected to debut in production form later this year as a 2026 model. A “conspicuously camouflaged prototype” will be on display at the Goodwood Festival of Speed from July 10 to July 13.

More information, including prices and specifications, will be revealed closer to launch. However, we do know that it will be based on the PPE platform, the same one underpinning the Macan EV and the Audi Q6 e-Tron.

The Macan EV has an EPA-estimated range of 308 miles. On the European WLTP scale, it’s rated at 613 km (381 miles). However, Porsche said the platform will receive “comprehensive upgrades” for the Cayenne.

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