1. Hawaii Energy Storage Seminar: Other Energy Storage Technologies
Abbas Akhil
Sandia National Laboratories
Distributed Generation and Energy Storage
(505)
June 16, 2010
Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL SAND P

2. Candidate Technologies
Commercially available now
Suitable for Hawaii applications
Flywheels
Thermal Energy Storage
Seawater Pumped Hydro

3. Flywheel Energy Storage
Highly compatible with “power” applications such as frequency regulation
Short, high power discharges of energy
Frequent cycles: cycle life exceeds 100,000 during operational life
Successful demonstrations in 20 MW sizes in California and New York grids
Beacon Power: Provider of frequency regulation
services on a merchant basis

4. Source: Beacon Power

5. Source: Beacon Power

6. 20 MW Frequency Regulation
Source: Beacon Power

7. Evolution of Flywheel Design
Technology has come a long way!!
Sandia Labs Test Flywheel, 1970’s
Beacon Flywheel, Today

8. Thermal Energy Storage
Ice is made during off-peak hours by existing/new chillers. It is used to cool in the afternoon, on-peak periods
Primary benefits:
Load shifting to off-peak hours
Customer-side demand reduction
Distributed storage
On existing rooftops
Central ice storage in large tanks

9. Ice Bear System Source: Ice Energy

10. Seawater Pumped Hydro
Limited, but potentially high value applications in Hawaii grids
5 – 30 MW, 4 – 6 hours of storage
Needs only 400 – 600 foot head
Advantages:
No impact on fresh water supplies
Sites near coast may need minimal civil work
Spinning reserve and system peak shaving
Complements renewables, especially wind farms
Reasonably commercial technology
Does not have cycle life or depth-of-discharge limitations (of batteries)

11. Okinawa Seawater Pumped Storage
Location - Okinawa Prefecture
Operation
Output - 30 MW
Effective Head m (446 feet)
Maximum Turbine Discharge - 26 m3/sec.
Type - Embankment dam, Rubber sheet lining
Gross Storage Capacity = 0.59X106 m3
(approx 6 hrs of storage)
Source: International Energy Agency

12. Okinawa Pumped Hydro
Source: International Energy Agency

13. Source: http://www.youtube.com/watch?v=asUa1PFix1A

14. Mahalo! Questions??