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Utilities ponder battery storage as solar soars

7/10/2012 02:48 AM EDT
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DrQuine
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re: Utilities ponder battery storage as solar soars
DrQuine   7/15/2012 10:18:23 PM
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It seems that one huge advantage of pumped hydro storage is that relatively little technology is required (pump / generator) and the bulk storage itself is simply water in a reservoir with a high efficiency of energy recovery. There are no batteries to maintain, repair, or upgrade. It is even possible to extend that capacity by increasing the depth of the storage pond or the surrounding retaining walls. Perhaps the Tennessee Valley Authority did something right when they built the Raccoon Mountain storage facility years ago.

selinz
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re: Utilities ponder battery storage as solar soars
selinz   7/12/2012 3:08:42 PM
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The best place to put excess electricity that is generated during the day is back to the grid where it is needed. I find it commendable (although I suspect that they don't have much choice) that PGE essentially gives 100% credit for electrons returned to the grid... I certainly wouldn't want PG&E draining my car battery just in time for me to have to use gas to get home (assuming that I had an electric car, which I don't)

prabhakar_deosthali
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re: Utilities ponder battery storage as solar soars
prabhakar_deosthali   7/11/2012 4:24:28 PM
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I support the idea of the stationary EVs being used as grid battery storage. While the utility companies save on their capital investment, the EV owners get their batteries charged at cheaper rates while their vehicles are parked in the office parking lots

GeniusEE
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re: Utilities ponder battery storage as solar soars
GeniusEE   7/11/2012 1:52:57 AM
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If if if, might might might. You reserve how much you need for the day. If you want to be an idiot, reserve 90% of the total available range. However, if you reserve the range you need, the rest is in arbitrage, meaning you get a free car battery, 1/3 of your vehicle cost back, free energy to run it, and a free buyback/recycle of the residual battery capacity at the end of vehicle life, still useful as a static grid store. The number of useful cycles is dumb math when the battery is basically free. So, you can be an idiot dinosaur who hogs all resource "if", or a smart mammal with a plan who winds up with free transportation, only paying for the style and functionality of the vehicle shell....the choice is yours.

Duane Benson
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re: Utilities ponder battery storage as solar soars
Duane Benson   7/10/2012 10:35:00 PM
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Of course, if your EV is in discharge to the grid mode and you need to go someplace, you may have lost too much of your range. Also, the additional charge / discharge cycles might shorten the life of your battery pack.

george.leopold
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re: Utilities ponder battery storage as solar soars
george.leopold   7/10/2012 7:32:41 PM
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We've talked to folks working on new wireless nets that will require better backup power. They too shy away from lithium ion as too expensive. As we reported, the integration of Li ion batteries in EVs seems to be the best way to scale the technology and reduce cost.

GeniusEE
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re: Utilities ponder battery storage as solar soars
GeniusEE   7/10/2012 5:39:16 PM
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The EV should be considered to be a grid element that is intermittently disconnected and moved. It spends more than 90% of its time plugged in, so the utilities need to look at the EV as a grid element, not a car. Subsidizing PEV cars will easily drop pack "costs" below $200/kWh for battery costs to utilities. An interesting, utility-centric, concept in this area is being licensed by these people www.zelentek.com

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