Counter-terrorism police are conducting further raids on people and locations associated with alleged would-be right-wing terrorist plotter Joshua Lucas, arrested on the state's South Coast on Saturday.

Police had been observing the online and real-life actions of the 21-year-old unemployed Sanctuary Point man since February, when an alleged sharp escalation in his behaviour online the week before prompted the police's joint counter-terrorism team to act.

It is alleged that Mr Lucas had planned to blow up an electrical substation on the South Coast and had planned to acquire military equipment, including firearms and items capable of making improvised explosive devices.

He was charged with one count of planning a terrorist attack, which carries a maximum sentence of life imprisonment upon conviction.