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The Energy Generator is an Architect Artifact found in a small cave in the Glacial Bay. While there are five individual sets of generators, they collectively act as one scan.

Two Ion Cubes can be found in close proximity to the generators. They were used as fuel for the generators.

Data Bank Entry

Energy Generator
Precursor artifact energy generators frame.png

Scans indicate that this array of alien hardware serves to accumulate and quickly release megajoules of energy, and is charged by ion cubes stored within. These super capacitors may be used to smooth transient power events on the conduits connecting various Architect sites.

Source: Scan an Energy Generator