MP for Corby Tom Pursglove says the decision to approve a new gasification plant is a sad day for the town.
Last week, plans for the Shelton Road site were formally approved despite widespread objections.
The plant will turn up to 195,000 tonnes of waste-derived fuel from across the region into electricity, but concerns were raised around health risks and the number of lorries that would use the site.
Mr Pursglove said: “I was indeed hugely disappointed to hear this news and it is a sad day for Corby.
“It is a frustrating decision and obviously I wish that councillors had listened to local calls and respected the wishes of local people.
“There was a very strong local campaign, and huge praise should go to all those who were involved in fighting this application – I really do believe that collectively we all fought the good fight.”
Only one councillor voted against the plans, questioning the plant’s sustainability.
Corby Council objected to the plans because, it said, there was not enough information provided on air quality, odour, noise and vibration.
A spokesperson for Corby Council said: “The borough council objected to the proposals and made representations at the county’s Development Control Committee, but all to no avail.
“The borough council is now considering the consequences of the county council’s decision.”