Britain's only Green MP has vowed to continue her fight to end fracking after being found not guilty of obstructing a public highway and a public order offence during high-profile protests.
The Brighton Pavilion MP was arrested outside energy company Cuadrilla's exploratory oil drilling site in Balcombe, West Sussex, last August 19.
She was among a group of protesters who had linked arms outside the site, which had become a national focal point for anti-fracking protests.
During the trial at Brighton Magistrates' Court alongside four co-defendants, Lucas, 53, said she "wanted to express solidarity" by protesting peacefully.
She was found not guilty of the two charges she faced - wilful obstruction of a public highway and breaching an order under Section 14 of the Public Order Act.
Outside court, she said: "We are pleased that the court upheld our right to peacefully protest against fracking, but this judgment is not a victory or cause for celebration.
"We will continue to campaign to end fracking and only celebrate when our world is on the path to a clean energy future."