Season begins as the Scottish Government is due to bring in a licensing system to control the practice.
The performances and protests aimed to highlight concerns over rising sea levels threatening communities.
Around 20 activists from Extinction Rebellion Scotland and Glasgow Calls Out Polluters are at the SSE gas power station.
Police have dispersed environmental protesters who gathered in front of BP's North Sea headquarters in Aberdeen.
Climate change protest group Extinction Rebellion have used a boat to block to the entrance to Shell headquarters.
Proceedings were disrupted twice by hecklers in the gallery, who were led away by police.