Turkey shut down five thermal power plants completely and one other partially for failure to comply with the law to install filters, authorities said Wednesday.

Four out of seven plants surveyed were allowed to operate temporarily, Environment Minister Murat Kurum told a news conference in Ankara.

“The power plants shut down will not be allowed to go into operation until they complete the environment protocols,” he said.

On Dec. 3, Turkish President Recep Tayyip Erdogan vetoed a law that would have delayed the installation of filters on thermal power plants.

Read more: Turkey shuts power plants for not installing filters