Mr Jean-François Bouteille (ESRF)
The ESRF produces very intense Hard Xray beams for the scientific community and is preparing the renewal of equipment inside the storage ring. This has motivated us to carry out a careful analysis of the energy efficiency over the life time of this large instrument. Taking into account the initial design of 1986 when electrical energy was cheap, uncertain future conditions are the key elements in the changes to technology needed for the preparation of this upgrade. Some examples of the consequences on the global cost calculation over the lifetime estimated of the future storage ring will be presented.