Green Party candidate Miranda Dunn narrowly avoided arrest on Tuesday after infiltrating the waste incinerator plant in Edmonton.
Ms Dunn, of Glenhill Close, Finchley, was among eight environmental campaigners who slipped past security and into the LondonWaste run site.
She was ejected by security within minutes after trying to block an access road during the peaceful direct action.
Police were also called to the scene.
Ms Dunn, Green Party candidate for Finchley & Golders Green in today's election, said: "I didn't want to get arrested because of the election. It was a very peaceful protest." She denied it was simply a publicity stunt.
Campaigners have dubbed the incinerator which generates electricity by burning household waste from seven London boroughs including Barnet a "cancer factory".
But the company says its emissions are well within European Union guidelines.
Five members of Greenpeace are on trial at Wood Green Crown Court this week charged with criminal damage after occupying the plant's chimney for four days in October last year.
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