Europe's governments must work together to deliver a "visible and stable" European energy policy or they will fail to attract the investment they need to meet sharply rising demand, according to Pierre Gadonneix, president of the World Energy Council and chairman of French energy group EDF.

The French government on Thursday ordered an investigation into the water table around all of France's 58 nuclear reactors in an effort to dispel fears raised by a leak from a treatment plant run by Areva in southern France.

Jean-Louis Borloo, ecology minister, has asked an independent committee to carry out the probe to stem mounting public concern over nuclear waste management after a low-grade leak at the Socatri treatment plant at Tricastin focused public attention on a still unexplained, older contamination of the water table.