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Microcap & Penny Stocks : TGL WHAAAAAAAT! Alerts, thoughts, discussion.
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To: peter michaelson who wrote (118779)9/4/2003 5:27:06 PM
From: Tom Swift  Read Replies (1) of 150070
 
Why do you want energy storage in the grid design? It is because of the differences between peak load demand and base load demand. Just to keep things simple lets say that the peak load demand is double the base load demand and the duration of the peak is three hours.

A megawatt hour is enough electricity to run about 1000 houses for an hour. The rule of thumb wholesale price for a MWh is $30 although it fluctuates with the weather and can go as high as $100 for peak power during the summer.

The UNSW site has cost projections: ceic.unsw.edu.au

Low cost for large storage capacities. Cost per kWh decreases as energy storage capacity increases, typical projected battery costs for 8 or more hours of storage being as low as US$150 per kWh.

This projection is $0.15 per Wh. An AA size NiCd is roughly 1 Wh and while they are cheap, they are not quite that cheap and I think the UNSW projection is optimistic.

However, using this number, a 10 MWh battery would cost 1.5 million dollars and would store ~ $300 worth of electricity while it is fully charged.

The unit capital cost of three hours of storage capacity is $225 per house (1.5x10e6 $ / 3,333 houses / 2 (half load). Depending on battery lifetime this might be OK.
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