Area Mex Command
The Area Mex command queues construction of metal extractors in a given area.
The individual constructions are ordered from the nearest mex to the builder in the area to the farthest, disregarding obstacles - for this reason it may be better to queue several Area Mex orders to guarantee an optimal builder walk path.
Holding ALT while placing an Area Mex order will place 4 solar collectors around each mex in the area. This protects the extractor and provides Overdrive. On hilly terrain or in the water, wind or tidal generators are used instead.
You can use the ALT modifier for adding generators to existing metal extractors as well.