And NICE GMAT!!! For one year programs there are plenty of good ones both in the US and Europe, although I don't think you will find many that specifically focus on the energy industry (most of the ones I know that have Energy concentrations are two-year programs):
In Europe: INSEAD, Said, Judge, LBS (15 month option here), HEC, (actually most Euro programs are one year)
US: Kellogg, Cornell, Babson, Goizueta
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