People who dump illegal waste will be fined and taxed under the Landfill Disposals Tax Bill.
Chairman of Ebbw Vale Business Forum Phil Edwards says jobs have been “thrown away”.
The Plaid Cymru leader’s comments came after targets were missed for trainee teacher numbers.
It overturns a 2015 decision by Wrexham councillors to reject the scheme.
Energy minister says “the necessary time” must be taken to fully consider the £1.3bn power scheme.