People fighting plans to build an incinerator at Devonport North Yard in Plymouth to are take their argument to court.
Planning permission for the waste-to-energy plant, that will will burn 250,000 tonnes of waste a year was granted last year.
Building work is due to start soon.
A group called PlymWIN will argue the city council's decision to grant planning permission was "unlawful" and will be asking the public for help towards the legal costs.
Residents are worried about health risks and the group says the permission breaches the EU Habitats Directive.