Cold-fusion plants
From The Stargate Omnipedia
Plants native to the prison colony of Hadante. The plants were used by the scientist Linea -- in conjunction with her "activators" -- to generate a source of power. The power generated by the plants is pollution-free and is sufficient to power the Stargate and generate an outgoing wormhole.
KEY EPISODE
Prisoners - Linea's cold-fusion plants are used to escape the prison world of Hadante.