The two proposed sites for a new incinerator have attracted opposition from local groups concerned about the impact on the environment.
Cardiff Against the Incinerator and Stop Newport Incinerator say that a better solution to domestic waste would be to increase recycling targets.
The two bidders, Veolia and Viridor, say that the plans represent a major investment and electricity generated by the incinerator will help power local homes and businesses.
More top news
A party political broadcast featuring a man “coming out” to his parents as a Plaid Cymru voter prompts mixed reaction on social media
A man who was cleared of murdering his wife on their Indian honeymoon is on the run after being convicted of a fraud worth £750,000.
An east-west split is starting to develop this afternoon. The best of the sunshine in eastern parts, cloudier with a strong breeze in west