Daimler’s ACCUMOTIVE And Enercity To Install 15 MWh Energy Storage System

FEB 16 2016 BY MARK KANE 5

From cars to power grids: Daimlers first industrial-scale lithium-ion unit is already on the grid and is used for the purposes of grid stabilisation and to smooth load peaks.

From cars to power grids: Daimlers first industrial-scale lithium-ion unit is already on the grid and is used for the purposes of grid stabilisation and to smooth load peaks.

Daimler’s subsidiary ACCUmotive and enercity (Stadtwerke Hannover AG) are developing one of the largest lithium-ion energy storage systems in Europe.

The 15 MWh ESS, built from around 3,000 battery modules, will be launched by the end of 2016 in Herrenhausen, Germany.

Interesting is that it will be a “living storage” with new replacement battery modules from the smart fortwo electric drive that will be employed in the ESS to keep it in perfect condition (charging/discharging from time to time and in optimum temperature range).

“What makes it particularly special is the fact that this is a spare parts storage facility for electromotive battery systems. Around 3000 of the battery modules, determined for the current smart electric drive vehicle fleet, are being pooled to create a stationary storage facility at the enercity site in Herrenhausen. With a storage capacity totalling 15 MWh, the installation is one of the largest in Europe. After completion, the energy storage facility will be marketed on the German primary balancing energy market. The storage facility is already the third major project for Daimler AG in this business sector.

2012 saw the launch of the third-generation smart fortwo electric drive and since then it has been convincing customers around the world. The next generation of the electric city car is now at the ready. But what actually happens should the battery become unusable? Automotive manufacturers are of course prepared for this eventuality and have suitable replacements available. In terms of efficient use of resources, partners Daimler, ACCUMOTIVE and enercity are now treading a unique path. Through the “living storage” of replacement batteries, they are creating an attractive business case that, in this form, can only be achieved together by an automotive manufacturer and a power supply company.

From cars to power grids: Developed for demanding service on board cars, the Mercedes-Benz energy storage units meet the very highest safety and quality standards.

From cars to power grids: Developed for demanding service on board cars, the Mercedes-Benz energy storage units meet the very highest safety and quality standards.

“Living spare parts store” as grid-supportive energy storage facility

By marketing the storage capacity on the German market for primary balancing power (PRL), the business model makes an important contribution to stabilisation of the power grid and to the economic efficiency of electromobility. In the event of increasing fluctuations in electricity feed-in from renewable energies such as wind and solar energy, such storage facilities help to ensure optimum settling of a mains frequency that has to be kept constant. With their storage capacity, they balance the energy fluctuations with practically no losses – a task that is currently undertaken predominantly by fast-turning turbines at the fossil power plants. The partners will start work on constructing the battery storage facility this year. After completion, grid-connected operation will be possible without interruption. enercity is responsible for marketing the storage facility on the primary balancing power market.

Fountain of youth for the battery

The innovative storage concept has a further decisive advantage. To be usable in the event of a replacement, a battery requires regular cyclising during its storage period, i.e. specific charging and discharging for the purpose of preservation. Otherwise it would suffer from deep discharging, which can lead to battery defects. In addition to the storage costs, the classic and potentially long-term storage of replacement batteries would therefore involve extremely high operating expenditure. The innovative approach adopted by the partner companies allows them to avoid this expenditure. The constantly fluctuating balancing power demand from the grid automatically ensures the required cyclising of the batteries. And the highly advanced battery management system employed by Daimler subsidiary ACCUMOTIVE ensures that the batteries are always in optimum condition in terms of temperature and charge level so that they meet the high standards required in terms of quality and service life. Rather than having an impact on the ageing process of the systems, this process has the effect of a fountain of youth.

From cars to power grids: Mercedes-Benz energy storages are also suitable for private use to buffer surplus power virtually free of any losses.

From cars to power grids: Mercedes-Benz energy storages are also suitable for private use to buffer surplus power virtually free of any losses.

Significant contribution to the energy turnaround

Electromobility plays an important part in achieving the CO2 targets in road transport and makes a major contribution to meeting the international climate protection targets. Here the Daimler AG understanding of sustainability goes way beyond the car product. The measures for environmentally sound and energy-efficient product design take into account the complete product life cycle – from development through production and product use to disposal and reprocessing. Here the efficient use of powerful batteries and their pooling is becoming an increasingly important aspect. With their concept, Daimler, subsidiary ACCUMOTIVE and enercity are creating a new win-win situation and are thus boosting the progress of the energy turnover in exemplary fashion.

Daimler AG: systematic development of the stationary storage business

Daimler entered the stationary battery storage business in 2015 with its subsidiary ACCUMOTIVE and has been developing its activities in this sector since then. The company offers attractive solutions for efficient energy storage, aimed at both industrial and private applications. Mercedes-Benz energy storage facilities for private households can be ordered now and will shortly be installed for customers in cooperation with selected sales partners such as energy service provider EnBW or SMA Solar Technology AG. Just a few weeks after the ground-breaking ceremony for the world’s largest 2nd use battery storage facility in Lünen, Westphalia – a joint venture between partners Daimler AG, The Mobility House AG and GETEC – Daimler is taking a further step toward developing its industrial battery storage business together with subsidiary ACCUMOTIVE and partner enercity. To this end, there will be a total of around 29 MW on the grid after completion of the spare parts storage facility. Further major projects are scheduled to start in 2016.

enercity (Stadtwerke Hannover AG): ready for the turnaround!

With an annual turnover of around €2.4 billion, Stadtwerke Hannover AG is one of Germany’s largest municipal energy suppliers. Under the umbrella brand “enercity – positive energie” there is a wide range of products and energy-related services on offer from a one-stop shop, also for many municipal facilities in the region. In total, enercity supplies over 700,000 people with electricity, natural gas, district heating and drinkable water. With its contracting holdings, enercity is active throughout Germany and, since 2012, also abroad.  The oldest enercity site in Hanover-Herrenhausen, where the first large power plant opened in 1902, is now a location for future projects. In addition to the joint battery storage project, the company implements further innovative projects at this site, such as a district thermal storage system, a combined heat and power plant, and the technical running of a virtual power plant.”

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5 Comments on "Daimler’s ACCUMOTIVE And Enercity To Install 15 MWh Energy Storage System"

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Well, that’s a good idea. I hope it doesn’t wear the batteries too much, though. I’d be interested to see percent capacity loss per year when stored conventionally versus used in grid stabilization applications like this.

15 MWH…is sufficient for how many households,and for how long????

As I understand it, this would not really be a fare comparison.
It seems to be used for ‘primary reserves’, which are the reserves that are stabilizing the grid at 50 Hz (Europe). Although the different types of balancing have different names, so I am not sure about this. If it is a ‘primary reserve’ however, the statement of 15MWh might not be the most usefull indication, as it will be charging/discharging all the time and the power output/consumption is the more useful factor to take into account.
Anyway… 15MWh would be the yearly consumption of something around 3 households… or the weekly consumption of ~150,…

5 homes a full year. Or more homes for less time.

But this is no seasonal storage, rather a fluctuation compensation storage.

andre asked:

“15 MWH…is sufficient for how many households,and for how long????”

I think a better question is this: What percentage of that 15 MWh is actually available for supplying power to the grid on a daily (or hourly) basis?

There appears to be an awful lot of hype in that press release; a very high noise-to-signal information ratio. Trying to separate out the tiny amount of useful information… it appears the packs stored there only need to be cycled very occasionally. Even in an emergency, just how many of those battery packs could be discharged all at once? My guess is that the wiring connecting the facility to the grid won’t support all that much power; won’t support discharging more than a small percentage at any one time. Why would Daimler pay for the infrastructure to discharge all the packs at once, when any one of them only needs to be cycled once or twice a month?