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September 27, 2009
Big Battery
Texas is slated to get a really big battery to improve grid reliability. Electric Transmission Texas LLC (ETT) has completed a contract with NGK-Locke, Inc. for a state-of-the-art, sodium-sulfur 4-megawatt NAS battery system, which will be installed in Presidio, Texas. ETT is a joint venture between American Electric Power (NYSE: AEP) and MidAmerican Energy Holdings Company (MidAmerican).And what are the capabilities of this battery? The NAS® battery system uses sodium-sulfur battery technology. This technology proposed by ETT for Presidio will provide the following benefits:One of the many things you can do with a battery like this is peak leveling. That means the transmission lines do not have to be designed for peak power use but only have to deliver the average power required at the load. It also means a smaller generator can be used to supply the load if the generator can supply the average load. Savings all around if the battery and its associated conversion equipment are cheap enough. Cross Posted at Power and Control posted by Simon on 09.27.09 at 05:02 PM |
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Big storage batteries like this can store 4 X 8 = 32 megawatt-hours. At $50 per MWhr at wholesale, that $1600 worth of electricity. Selling it back to the grid at say twice the average rate means it it would gross $1600 each time it goes through a full discharge.
Batteries have a large capital cost and are only good for some many discharge/recharge cycles.
This one is probably a LONG way from economical for peak shaving purposes. Some one thought it was a worthwhile investment for outage backup since they are on the Mexican power grid.
Here's a piece on the economics of electric storage:
http://www.energypulse.net/centers/article/article_display.cfm?a_id=1808