The authority is planning to close the tip in the 2025-26 financial year.
It has planning permission for a solar farm on the land, expected to power the council’s new bin lorries.
Mr Howells said: “The council planning on closing the landfill so soon is quite a surprise, especially since it claimed at the High Court that closing the landfill to allow me to search would have a huge detrimental impact on the people of Newport, whilst at the same time they were planning to close the landfill anyway.”
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