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Enron Mail |
Vince,
I'd like to purchase some copies of the XPRESS LP solver for the gas storage optimization model. We have previously discussed the purchase of CPLEX, but after trialing both systems, have found some worthwhile advantages with XPRESS. If others find Planner / CPLEX best suited to their application, I see no problem is their use of a different system - both have strengths, and it is likely that I would use Planner/CPLEX myself on some future project if we were to have both systems available. XPRESS is particularly suited to my application because it handles Special Ordered Sets. This is a very efficient way of representing the storage ratchets as the integer search process is able to use the extra information provided by the set, rather than just using binary integer variables to represent the ratchets. Planner is a C++ interface for CPLEX. It has some significant limitations, and does not permit access to all CPLEX features. Dash Optimization have made the following offer: All software purchases made by Enron this year will be at 30% off the list price - we do not need to make a single purchase of any specific quantity of licenses to obtain this discount. 90 days of full maintenance services will be provided with the purchase. The EMOSL utility will be provided at no cost. The XBSL system will be provided at no cost when it is released in a few weeks time. For the Gas Storage Optimization model, I would like to purchase: One development license, hyper version, with modeller, primal/dual simplex, MIP search, dlls, EMOSL and XBSL when available. List price $10,000 Discounted price $7,000 Two run time licenses for above, List price total $8,000 Discounted price $5,600 Total cost $12,600 I've used the usually security request system to set the purchase process going, should you agree to this. Tom.
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