You may win an Economic Victory by cornering the Global Energy Market.
You must have discovered
Planetary Economics in order to pursue such a plan.
Cornering the Global Energy Market will require a sum of energy credits roughly equal to the cost to "mind control" every remaining base on Planet. When you are ready to make such an attempt, select "Corner Global Energy Market" from the HQ Menu.
When a faction attempts to corner the Global Energy Market, all other factions will be given an allotted period of time in which they can capture or destroy the cornering faction's Headquarters and thereby foil the plan.
For Economic Victory, you are awarded 1200 points minus 2 for every game turn elapsed. If Cooperative Victory is enabled, Pact Brothers of the winning faction receive half the bonus points.