<div>Many thanks to the developers of IPOPT for large scale NLPs and making it opensource. </div>
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<div>Since our MARKAL-MACRO energy systems analysis model had a problem running with other solvers, GAMS suggested us to use IPOPT. It handles our model well, we are happy that atleast it runs... </div>
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<div>Since our model has several thousand equations with several hundred thousand non-zeros, it takes nearly an hour for a run. It uses MUMPS as a linear solver and the documentation has suggestions on using PARDISO. </div>
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<div>We use CPLEX for our LP based MARKAL, which solves the same system in LP within 5 minutes (without 5 macro economic equations).</div>
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<div>Would it be possible for us to use CPLEX instead of MUMPS within IPOPT? </div>
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<div>Thanks in advance for your help.</div>
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<div>Vatsal</div>
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