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Remote harvesting is a strategy used by many players to harvest more energy than is available in the rooms they own. It involves sending creeps into a nearby room, either an unowned room or a Source Keeper room, and harvesting the energy from those rooms and bringing it back.
Source Keeper Rooms
Each 10x10 sector of the map contains 8 source keeper rooms in a ring around the center. These rooms have no controller, so they cannot be owned. However, they contain 3 sources each, and each source contains a maximum of 4000 energy rather than 3000. This makes them a good source of energy. They also contain a mineral, just like other rooms, with an extractor already built on top.
However, these rooms are guarded by non-player Source Keepers, which will attack creeps that try to harvest the sources.