A Dyson swarm was a technology first developed in 2445 by Verónica Mariano. The first one orbited Luyten's star.
A Dyson swarm is very similar to a Dyson Sphere, with one major difference. A Dyson swarm is a collection of objects gathering stellar rays to create power.
A diagram of a Dyson swarm.
This design is far cheaper, but produces a lot less power, about a tenth of what a Dyson sphere could produce.