Published on January 29th, 2015 | by James Ayre


Eos Energy Storage’s Aurora Battery System Commercially Available In 2016, At $160/kWh

January 29th, 2015 by  

Eos Energy Storage will be making its megawatt-scale Aurora system commercially available starting in 2016 at a price of $160/kWh, according to a recent press release.

The company’s standard offering, the Aurora 1000|4000 product, is a containerized 1 megawatt (MW) DC battery system that can provide roughly 4 hours of continuous discharge — thereby representing a fairly cost-effective energy storage solution that’s competitive with gas-peaking generation and/or conventional utility distribution.

Eos Energy Storage

“This system represents the culmination of many years of development and collaboration with our Genesis Partners to design a product with a clear value proposition,” stated Eos CEO Michael Oster.

The Aurora system makes use of Eos’s Znyth battery technology — based on a “non-toxic” aqueous electrolyte + novel zinc-hybrid cathode — to offer customers a low-cost energy storage system that possesses a long working life.

Some details via a recent press release:

As Eos’s manufacturing capacity ramps up, the company expects to deploy an aggregate of 1 MW of capacity over a series of projects in 2015, beginning with Consolidated Edison and GDF SUEZ, and including a project with Pacific Gas & Electric funded by the California Energy Commission.

The Aurora system’s commercial availability will improve the competitiveness of developers bidding into the PG&E and SCE solicitations due this quarter.


“A large number of inquiries regarding the California storage opportunities prompted us to make this announcement,” noted Eos President Steve Hellman. “We believe in full transparency around availability and pricing; we hope in this manner to provide the best product and the best value to our partners and customers.”

As of right now, the company is partnering through its “Aegis Program” with a number of large companies — Toshiba, Gamesa Electric, etc — to sell, install, and maintain its AC-integrated battery systems.

“We’re delighted to work with some of the largest suppliers of utility equipment in the world to provide the lowest cost turn-key energy storage solution in the market,” stated Hellman. The program is structured such that Eos supplies the containerized DC battery and battery management system while the Aegis Partners provide the power control systems and integration layer, and take responsibility for installation, operation, and maintenance.

Those looking for further information can find it in our previous coverage, including these stories:

Image Credit: Eos Energy Storage

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's background is predominantly in geopolitics and history, but he has an obsessive interest in pretty much everything. After an early life spent in the Imperial Free City of Dortmund, James followed the river Ruhr to Cofbuokheim, where he attended the University of Astnide. And where he also briefly considered entering the coal mining business. He currently writes for a living, on a broad variety of subjects, ranging from science, to politics, to military history, to renewable energy. You can follow his work on Google+.

  • Ronald Brakels

    If it is cycled once per day and operates with no loss or maintenance requirements for 10 years before transforming into a cloud of butterflies, then we’re looking at a cost of about 2 US cents per kilowatt-hour stored. Looking at the predicted wholesale electricity prices for the next 24 hours for South Australia I see it is predicted to be zero cents early in the morning with a high of about 1.3 US cents at about 9:00 a.m.. Which means it doesn’t pay for itself. Okay, maybe tomorrow in South Australia wasn’t such a great example. It’s not usually like this in summer! (Or any time until recently.) If it can provide electricity storage at 2 cents a kilowatt-hour it is going to pay for itself in a lot of places and is quite an economic breakthrough. Need more information on the system to know how it will actually perform in real life, however.

    • S Herb

      The $160 figure almost certainly does not cover the power conversion equipment needed for connection to the grid (or anything else). This would raise the cost significantly, but I haven’t been able to find any details.

    • Vensonata

      Hmmm. $160 divided by ten years (3650 days) one cycle per day. Doesn’t that equal 4.4cents kwh? By the way that is still half the price of anything lithium that you can purchase today. They don’t say how many cycles. But the Sony Olivine Lithium battery that they sell in Germany has 8000 cycles, I think you can buy them in Aus as well. The cost? A mere $1300 per kw! Or 16cents per kwh.

      • Ronald Brakels

        Oh yeah, I totally messed that up. As I wrote above, with a 10% discount rate it actually comes to about 7 cents a kilowatt-hour. But with a 5% discount rate, which is a figure some people are fond of for power plant calculations it comes to about 5.7 cents. Thanks for catching my stupid mistake.

      • sjc_1

        That is assuming a scrap value of $0, it is a flow battery, so it might be rebuilt at a cost lower than purchase.

    • Bob_Wallace

      EOS – 10,000 cycles. A bit over 27 years of daily cycling.

      It’s on their website which I won’t like since it is taking me many, many minutes to open a page.

      BTW, Ambri is now making a 300 year lifespan claim for their liquid metal batteries. Unlimited cycling during those 300 years. If their batteries are made with “cheap as dirt” materials as they claim then we’re talking close to free storage. The only real cost to storage would be the power lost (less than 1 cent using 4 cent wind/solar inputs), real estate and owner profits.

      • Ronald Brakels

        Okay, with 10,000 cycles and no other costs, if it is cycled once a day at a 10% discount rate it comes to about 4.7 cents a kilowatt-hour. And thanks to the magic of finance, with a 300 year lifespan and 109,500 cycles it drops down to 4.4 cents a kilowatt-hour. With a 5% discount rate those figures become 3 cents and 2.2 cents.

        But it doesn’t have to be cycled once per day. It could be charged on off peak electricity in the early hours of the morning and then used to meet the morning peak and then charged on cheap solar electricity in the day to help meet the evening peak. With twice a day cycling and 10,000 cycles total it would come to 3.1 cents a kilowatt-hour with a 10% discount rate, or 2.3 cents with a 5% discount rate.

        Now, as S Herb mentioned above, there are going to be other costs and I haven’t account for charge and discharge losses, which don’t really matter if it is being charged with free or negative priced electricity, but I can’t think of anywhere in the world where that’s reliably available – yet. And I’ll mention that while it can easily be cycled twice a day, being cycled twice a day every day is unlikely.

        But the value of this system is not just arbitage, which today on a weekend would not be able to make money anywhere in the Australian National Electricity Market, but also in saving on transmission costs. We could plonk one of these down in say Hervey Bay and soak up rooftop solar generated electricity during the day and use it to help meet evening demand and save a heap on the cost of transmission upgrades that the area apparently needs thanks to a growning population.

      • Neptune

        What is the round trip efficiency of Ambri batteries?

        • Bob_Wallace

          According to Ambri –

          “The cells have a DC-to-DC efficiency of 80 percent at a five-hour charge/discharge rate and an AC-to-AC efficiency of 70 percent to 75 percent.”

  • Marion Meads

    just too bad each unit is the size of one 4 MWH container… Which would be overkill for my house.

    • Vensonata

      Just get 40 people who want a 100kw battery for $16,000 each. Spend a day splitting it up then turn the container into a tiny house. Voila! Or maybe start a business where you get your battery for free and 39 people pay full price.

    • Philip W

      You would never ever any problems running out of electricity 😀

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