The Solar Satellite is a civil ship which produces 1-40 energy depending on your distance between the sun. It's price and building time is extremely low. However, they have no defense themselves and can easily be destroyed to disrupt energy production, so it is recommended you escort them using combat fleets. If your distance between the sun has a big difference, it is also recommended not to use them as they will produce less energy. However, they have the advantage of being ships, not buildings. This is because that there is no limit to how many ships you can build instead of buildings. The more Solar Satellites built, the more energy is produced.