A conspiracy charge against a climate activist over a foiled publicity stunt protest at the Woodside Energy boss's family home has been dropped.
Joana Partyka, 40, was accused of conspiracy to commit an indictable offence after counter-terrorism police arrested three activists at Woodside chief executive Meg O'Neill's Perth home in August 2023.
The Disrupt Burrup Hub member wasn't one of them and she was charged with the conspiracy offence in the months after.
She was scheduled to fight the charge at trial in October but it was vacated when prosecutors withdrew the charge on Wednesday in the WA Magistrates Court.
Outside court, Partyka said the conspiracy charge showed the outrageous lengths to which authorities would go to silence peaceful climate protesters.
"Police haven't provided a reason for why they suddenly dropped the charges, but I think a reasonable inference to draw is that they had no case against me," she told AAP in a statement.
"That's enormously vindicating."
Partyka said the allegation had impacted her life negatively for almost two years and she was relieved the matter was over.
"This conspiracy charge against me was nothing more than a weapon intended to keep me quiet — a perverse and undemocratic abuse of legal instruments designed to protect the public," she said.
Partyka was awarded $7000 for her legal costs.
Jesse Noakes, Matilda Lane-Rose, Gerard Mazza and Emil Davey pleaded guilty in the same court in February to attempted unlawful damage and trespass over the protest.
Mr Davey and Ms Lane-Rose were each fined $2000 and granted spent convictions.
Noakes was fined $2500 and Mazza was fined $3500.
Police had been aware of the group's plans for about a week before their early morning arrival at Ms O'Neill's home with an ABC Four Corners television crew, who had intended to film the action.
In the days after the incident, WA Premier Roger Cook said the action was carried out by "extremists seeking to terrorise".
Ms O'Neill also said the group were extremists and the action was designed to threaten her and her family.
Mr Cook also wrote to the ABC to complain about the broadcaster's alleged "complicity" in the incident.
The Burrup Peninsula, in WA's northwest, known as Murujuga to traditional owners, contains the world's largest and oldest collection of petroglyphs.
Disrupt Burrup Hub claims Woodside's operations in the area and its proposed expansion could produce billions of tonnes of carbon dioxide by 2070.
It has carried out a series of actions against Woodside in recent years including the release of stench gas at the company's Perth headquarters which forced the evacuation of about 2000 staff.
Partyka was sentenced to a seven-month prison sentence suspended for 12 months in relation to this action.
She also sprayed the Woodside logo in yellow paint on Frederick McCubbin's masterpiece Down on His Luck at the Art Gallery of WA.
