Brighton Pavilion MP Caroline Lucas 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 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.
More top news
Simon's Blog - Stormy Weather
It's that time of year again... Shrove Tuesday is nearly here and many of us are getting ready to cook up a batch of pancakes.
Monday night's weather for the east of the region