Cost-benefit analysis of grid energy storage

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1 Cost-benefit analysis of grid energy storage Robert L. Fares Graduate Research Assistant IEA Energy Storage Technology Roadmap Stakeholder Engagement Workshop September 24, 2013

2 Outline The limitations of a grid with no storage Application analysis: frequency regulation Future work: distribution-level storage Robert Fares Graduate Research Assistant September 24,

3 The present grid delivers energy on demand Source: Texas Electricity Alliance Robert Fares Graduate Research Assistant September 24,

4 Adding energy storage could improve the grid s operation 1. Reduce overall electricity costs 2. Improve electric reliability 3. Integrate renewable energy Robert Fares Graduate Research Assistant September 24,

5 It is important to consider the costs and benefits of energy storage The cost of energy storage depends on the specific technology involved The benefits of energy storage depend on the service it provides and the local energy market or utility electric tariffs Robert Fares Graduate Research Assistant September 24,

6 Storage application analysis Frequency regulation Robert Fares Graduate Research Assistant September 24,

7 Frequency regulation balances electric supply and demand Load Without Regulation System Load Hour Robert Fares Graduate Research Assistant September 24,

8 Frequency regulation balances electric supply and demand Load Without Regulation Net Load With Regulation System Load Load (GW) Hour Robert Fares Graduate Research Assistant September 24,

9 Valuing energy storage for frequency regulation Regulation service prices Regulation dispatch signal Optimization $ Energy storage model Robert Fares Graduate Research Assistant September 24,

10 Case study: a vanadium redox flow battery (VRFB) for frequency regulation in Texas Grid data Battery model Figure from: Dunn, B., Kamath, H., & Tarascon, J. M. (2011). Electrical energy storage for the grid: A battery of choices. Science, 334(6058), Robert Fares Graduate Research Assistant September 24,

11 Case study: a vanadium redox flow battery (VRFB) for frequency regulation in Texas Grid data Battery model Zhao, P., et al. "Characteristics and Performance of 10kW Class Allvanadium Redox-flow Battery Stack." Journal of Power Sources (2006): Robert Fares Graduate Research Assistant September 24,

12 URS Capacity Price VRFB Regulation Power Dispatched 1.0 (MW) ($/MW) Our model reveals the potential value of a VRFB on a given day VRFB Cell Current Density DynamicState$Time VRFB Cell Voltage DynamicState$Time VRFB State of Charge DynamicState$Time (ma/cm2) ($/MW) DRS Capacity Price Wholesale Energy Price (V) ($/MWh) VRFB Dispatch Signal (%) +1 URS -1 DRS Hour Hour Robert Fares Graduate Research Assistant September 24,

13 We use three years of ERCOT data to estimate the value of a VRFB Daily Regulation Service Revenue ($) January 2007 July 2007 January 2008 July 2008 January 2009 July 2009 December 2009 Robert Fares Graduate Research Assistant September 24,

14 We use three years of ERCOT data to estimate the value of a VRFB Net Present Value ($/kw) 1000 Discharge Duration 30 minutes 1 hour hours 3 hours 4 hours System Cost 1 hour: $ /kW 4 hours: $ /kW VRFB System Cost ($/kw) Robert Fares Graduate Research Assistant September 24,

15 Conclusions A VRFB operating as a generator to provide frequency regulation is just barely cost competitive To be an appealing technology, grid storage will most likely have to provide transmission and distribution services in addition to electricity market transactions Robert Fares Graduate Research Assistant September 24,

16 For more details on our analysis Fares, R. L., Meyers, J. P., & Webber, M. E. (2014). A dynamic model-based estimate of the value of a vanadium redox flow battery for frequency regulation in Texas. Applied Energy, 113, doi: /j.apenergy Robert Fares Graduate Research Assistant September 24,

17 Future Work Cost-benefit analysis of distribution-level energy storage Robert Fares Graduate Research Assistant September 24,

18 Where energy storage is located affects its benefit Source: Texas Electricity Alliance Robert Fares Graduate Research Assistant September 24,

19 Real-life electricity data will be used to evaluate distribution-level storage Electricity data are being collected from over 300 residences 185 homes in the study are equipped with rooftop photovoltaic panels Electricity use and solar production are recorded every one minute Robert Fares Graduate Research Assistant September 24,

20 Microgrid and Virtual Power Plant Robert Fares Graduate Research Assistant September 24,

21 Microgrid and Virtual Power Plant Robert Fares Graduate Research Assistant September 24,

22 Acknowledgements The University of Texas at Austin Dr. Michael E. Webber Pecan Street Inc. U.S. Department of Energy Smart Grid Demonstration Program Robert Fares Graduate Research Assistant September 24,

23 Robert L. Fares Graduate Research Assistant

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