Former Wales Secretary Peter Hain was among witnesses who gave evidence to the Energy and Climate Change Committee on plans for a Severn barrage on 10 January 2013.
Plans for a £30bn barrage across the Severn estuary were revived in August 2012 after Prime Minister David Cameron instructed officials to look into them.
Peter Hain resigned as shadow Wales secretary in order to back the project.
Supporters say the barrage would provide 5% of the UK's electricity and create thousands of jobs. Environmentalists object, saying it would harm local wildlife.
The committee session was divided into three sections.
At 9.30am, the witnesses were:
- Labour MP Peter Hain
- Martin Mansfield, General Secretary of Wales TUC
- Andy Richards, President of Wales TUC and Wales Secretary for Unite Union
- Kate Jennings, Head of Site Conservation Policy for the RSPB
- Martin Salter, National Campaigns Coordinator for the Angling Trust
- Dr Simon Pryor, Director of Natural Environment for the National Trust
- Martin Spray, Chief Executive of the Wildfowl and Wetlands Trust
- Simon Bird, Chief Executive of the Bristol Port Company
- Matthew Kennerley, Port Director South Wales for Associated British Ports
- Professor Tim Broyd, Engineering the Future alliance