SRB cost per kwh compared to Orion

http://groups-beta.google.com/group/soc.history.what-if/msg/6d5cd98d21942357?hl=en&
"bombardmentforce Jul 27, 9:54 am
Newsgroups: soc.history.what-if, rec.arts.sf.science
From: "bombardmentforce" Date: 27 Jul 2005 06:54:47 -0700
Subject: Re: The Soviet O'Neill Habitats

By way of comparison the shuttle orbiter has 52,578 Kwh of energy at
seperation roughly 37,541 Kwh of that from the SRBs so the solid rocket
cost per delivered kwh works out to about 1,598 $2001. "


References
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Sme Thrust: 28.6 %
SRB Thrust:71.4 % of total
http://science.ksc.nasa.gov/shuttle/technology/sts-newsref/srb.html
alt at sep: 150,000 feet= 45720 m = *9.81 .419416 megajoules/kg = 33,002 Mj= kwh
vel at seperation: 6536 ft/sec= 1992 m/s = 1/2 * 78,687 * 3.968408 = 156,131 mega joules= kwh

Cost: 30 million $2001 each
http://www.orbit6.com/crisf/text/shc_tom.htm
mass of shuttle:78,687 kg OV-104 Atlantis
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1598.23608 $/kwh 37541.39 Kwh

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m/ft =.3048
KILOWATT HOUR /JOULES = 2.77800E-07
killowatt hour / megajoule = 2.778 e-01