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Duke Energy upgrading Notrees 36 MW grid storage system with Samsung SDI Li-ion batteries

Duke Energy, Samsung SDI and Younicos are partnering to update Duke Energy’s 36-megawatt (MW) energy storage and power management system at the company’s Notrees Windpower Project in west Texas. The system, one of the US’ largest, has been operating since 2012 with lead acid batteries. Over the course of 2016, these batteries will be gradually replaced with lithium-ion technology.

Duke Energy, the nation’s largest electric utility, currently owns nearly 15% of the grid-connected, battery-based energy storage capacity in the US, according to independent research firm IHS Energy.

Duke Energy works closely with ERCOT (Energy Reliability Council of Texas), which signals to the battery storage system to either dispatch stored energy to increase frequency or absorb energy to decrease frequency, helping to smooth and balance peaks and valleys on the ERCOT grid. By rapidly storing or releasing energy, the system can respond quickly to regulate frequency and provide additional services for grid management.

Samsung SDI, as primary engineering, procurement and construction manager, will provide its high-performing lithium-ion batteries and associated Battery Management System (BMS).

Younicos will provide its energy storage management system (ESMS), which will work in concert with the Samsung SDI software and batteries. The Younicos ESMS interprets the signal from ERCOT, enabling the Notrees battery project to store or dispatch energy as needed, while maintaining the energy storage system in an optimal performance state.

Younicos is also providing system design, engineering, software integration and testing, along with post-implementation engineering services.

In 2009, Duke Energy announced plans to match a $22-million grant from the US Department of Energy (DOE) to install large-scale batteries capable of storing electricity from the grid or produced by the company’s 153-MW Notrees Windpower Project. The system, one of the nation’s largest, is located in Ector and Winkler Counties, Texas, and has been operating since 2012.



Battery energy storage is a sure way to ensure 24/7 REs from Solar or Wind facilities and to regulate existing energy networks/grids.

Current cost may be a bit high but with batteries going down to $100/kWh in the not too distant future, REs with storage will soon be competitive and even cheaper than polluting CPPs, NGPPs and even more so versus vey costly NPPs.


@HarveyD: I disagree.

The cost normally would be a factor of 2x larger without the grant.
This battery is providing frequency (power) regulation. Say there are 3 significant gusts/lulls per hour that the battery regulates, then the battery gets used ~70x per day. To eliminate traditional power with wind turbines you would have to cover month long non-windy patches, so the battery would be being fully utilised say once per 30x days. Combine that and you have a factor of 4200x.

All the above is very approximate and it doesn't show that the cost of the battery has to reduce by 4200x to succeed as energy storage as there are other costs like avoided power stations. But it illustrates that batteries being competitive for frequency regulation doesn't mean that batteries as grid energy storage is around the corner.

Batteries are currently being used for frequency regulation, off-grid energy storage and private (grid attached) energy storage. Best bet for grid storage is where the renewable energy is equatorial solar (rather than wind) so that 24 hour storage gives you 24/7 benefits. But if you don't want brown outs and you haven't the battery to cover long periods of low RE output then you're not going to decomission traditional power stations. The best that the batteries can do for you is increase the efficiency of these stations when they are in (spinning) reserve. Getting back to batteries as regulation again.

Seem like there is an analogue between cars and power systems
ICE <-> traditional power stations
HEV <-> traditional + battery regulation
PHEV <-> traditional + renewable + battery storage/regulation
BEV <-> renewable + battery storage
The HEV has a small battery that is used frequenctly, the BEV a large (expensive) battery but with the avoided cost of the ICE. And not many people are ready for their _only_ car being a BEV just as not many grids are ready to be RE + battery only.


Duke Energy has to do something to green wash their image now that Pat McCrory is being watched too closely to cover their a$$es

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