Hundreds of protesters have marched on Aberthaw power station, calling for its closure, and more investment in green jobs.
They say closing the station could reduce deaths from air pollution and "end the suffering of communities living near to opencast coal mines in Wales."
They argue that inefficient power stations are not needed, and that Wales should be moving towards renewable energy, with projects such as the Swansea Bay lagoon.
Owners of the station, RWE, say they are investing £5m in technology that will 'significantly lower' the station's emissions, and the Welsh Government have reiterated their commitment to renewable energy.
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