An opposition member claimed the borough had been 'stabbed in the back' by a vote not to oppose burner proposals at County Hall.
Councillors feared the scheme could have led to further development in the area.
Officials say risks from all the sites involved have been fully assessed.
An investigation has found 'fundamental standards' were breached in the case.
But a critic was accused of trying to have it both ways by calling for public consultations on the authority's plans.
County and district leaders have given their reaction to one of the big headlines from Boris Johnson's Cabinet reshuffle.
A councillor claimed residents have been 'badly let down' by the problems.
Formal plans will now be submitted for more than 200 properties in an area of Gaywood where nearly 400 houses were approved in the spring.
Councillors have overwhelmingly backed a motion to formally declare a climate emergency.
A panel of councillors has called for action to help bring people back into Lynn ahead of the Christmas trading period.