A planner working on the £500million incinerator recommended its refusal just days before he quit the case.
Planning officer Ben Gilpin was removed from overseeing Urbaser Balfour Beatty's planning application for the burner at Javelin Park, near Haresfield.
The details emerged after campaign group Glosvain made a Freedom of Information request to Gloucestershire County Council.
In an email from Mr Gilpin to other members of the planning team, he says he aired his views on the plans during a meeting with his bosses.
Responsibility for the application was then transferred to strategic development manager Chris Kenneford, who recommended approval of incinerator plans in Buckinghamshire in his previous job.
A 284-page dossier obtained by Glosvain shows other e-mails in which it emerges that the council appointed BPP Consulting as consultants on the plans without offering the work out to tender.
They too worked on the Buckinghamshire incinerator plans.
Ian Richens, from Glosvain, said: "The council is incapable of a fair determination and the application must be called in for consideration by an independent inspector at a public inquiry."
But the council's chief operating officer Duncan Jordan said: "In September, we appointed BPP to act as a critical friend to review the work being undertaken in-house.
"This role was then extended in October after the council's case worker formally requested to be taken off this particular case.
"At that stage of the application, we were still carrying out our formal consultation process and we're still doing this now with a likely end date being early 2013.
"October was therefore far too early for a fully informed view to have developed and indeed it is still too early as some of the key consultees haven't given us their views.
"We will only present the report for consideration by the planning committee once all consultation is complete and a balanced recommendation can be made."
Planning officer Ben Gilpin was removed from overseeing Urbaser Balfour Beatty's planning application for the burner at Javelin Park, near Haresfield.
The details emerged after campaign group Glosvain made a Freedom of Information request to Gloucestershire County Council.
In an email from Mr Gilpin to other members of the planning team, he says he aired his views on the plans during a meeting with his bosses.
Responsibility for the application was then transferred to strategic development manager Chris Kenneford, who recommended approval of incinerator plans in Buckinghamshire in his previous job.
A 284-page dossier obtained by Glosvain shows other e-mails in which it emerges that the council appointed BPP Consulting as consultants on the plans without offering the work out to tender.
They too worked on the Buckinghamshire incinerator plans.
Ian Richens, from Glosvain, said: "The council is incapable of a fair determination and the application must be called in for consideration by an independent inspector at a public inquiry."
But the council's chief operating officer Duncan Jordan said: "In September, we appointed BPP to act as a critical friend to review the work being undertaken in-house.
"This role was then extended in October after the council's case worker formally requested to be taken off this particular case.
"At that stage of the application, we were still carrying out our formal consultation process and we're still doing this now with a likely end date being early 2013.
"October was therefore far too early for a fully informed view to have developed and indeed it is still too early as some of the key consultees haven't given us their views.
"We will only present the report for consideration by the planning committee once all consultation is complete and a balanced recommendation can be made."
